Decibel X Downloads & RevenueDecibel X: dB Noise Meter, SLM · App Store & Google Play
Decibel X: dB Noise Meter, SLM by SkyPaw Co., Limited is on App Store and Google Play. Active Users (MAU & DAU), Downloads, rankings, keywords, revenue, and rating totals.
Decibel X: dB Noise Meter, SLM update history & changes
Last change · 36 events since 4 Nov 2011Full timeline ↓📈iOSEntered the top 100🆕AndroidFirst spotted by AppInsider⭐iOSPassed 100K ratings⭐iOSRatings taking off in United States📈iOSEntered the top 100📦iOSUpdated to version 9.9.9✏️iOSNew screenshots✏️iOSNew iPad screenshots📦iOSUpdated to version 9.9.8🔎iOS#1 for “noise”📊iOSPassed 10M monthly users📦AndroidVersion 9.3.9🆕AndroidReleased on Google Play
Full timeline · 34 events in the last 12 months
- 📈Decibel X: dB Noise Meter, SLM entered the top 100iOSTop Grossing · Utilities · CA
- 🆕Decibel X: dB Noise Meter, SLM first spotted by AppInsiderAndroidUnited States (found via search)
- 📈Decibel X: dB Noise Meter, SLM entered the top 100iOSTop Free · Utilities · KR
- 📦Decibel X: dB Noise Meter, SLM updated to version 9.9.9iOSThanks for using Decibel X! Here's what's new for the version 9.9.9:
∿ [Improvements] - iPhone Duo and iPad: every screen except the Camera now rotates to all four orientations
∿ [Fixes] - Fix the Camera preview is rotated 90 degrees on iPhone Duo
∿ [Fixes] - Fix the "Premium activated" screen popping up every time the app is opened by a subscriber
∿ [Fixes] - Several other minor tweaks & bug fixes
What to expect in upcoming versions:
∿ Support external or bluetooth mics
∿ Hearing test… more - 📈Decibel X: dB Noise Meter, SLM entered the top 100iOSTop Grossing · Utilities · ID
- 📈Decibel X: dB Noise Meter, SLM charting in a new countryiOSIndonesia
- ✏️Decibel X: dB Noise Meter, SLM: new screenshotsiOS8 screenshots (was 8) · US
- 📈Decibel X: dB Noise Meter, SLM entered the top 100iOSTop Grossing · Utilities · FR
- 📈Decibel X: dB Noise Meter, SLM entered the top 100iOSTop Grossing · Utilities · IT
- ✏️Decibel X: dB Noise Meter, SLM: new iPad screenshotsiOS· FR
- ✏️Decibel X: dB Noise Meter, SLM: new screenshotsiOS8 screenshots (was 8) · FR
- ✏️Decibel X: dB Noise Meter, SLM: new iPad screenshotsiOS· JP
- ✏️Decibel X: dB Noise Meter, SLM: new screenshotsiOS8 screenshots (was 8) · JP
- ✏️Decibel X: dB Noise Meter, SLM: new iPad screenshotsiOS· KR
- ✏️Decibel X: dB Noise Meter, SLM: new screenshotsiOS8 screenshots (was 8) · KR
- ✏️Decibel X: dB Noise Meter, SLM: new iPad screenshotsiOS· DE
- ✏️Decibel X: dB Noise Meter, SLM: new screenshotsiOS8 screenshots (was 8) · DE
- 📦Decibel X: dB Noise Meter, SLM updated to version 9.9.8iOSThanks for using Decibel X! Here's what's new for the version 9.9.8:
∿ [New] - Full support for the iPhone Duo
Previously in version 9.9.7:
∿ [Fixes] - Camera: the dB readings and the graphs on the overlay now update smoothly along with the live video, instead of looking frozen
Previously in version 9.9.6:
∿ [New] - Siri & Shortcuts: run the app hands-free - start or stop measuring, save a recording, run the dosimeter, take a photo or record a video, create a PDF report, share a recording, change the weighting, set a noise alert and more
∿ [New] - Ask Siri what a term means ("What does TWA mean in Decibel X?") without opening the app
∿ [New] - Search your recordings in the Data tab - by name, note, location or date - or just ask Siri to find them
∿ [New] - Filter recordings by date: Today, last 7 or 30 days, or a custom range
∿ [New] - Swipe a recording to delete it, or drag one straight into Mail, Files or Notes
∿ [New] - Photos, videos and recordings now log the full street address instead of only the city
∿ [New] - The loud noise alert now shows its threshold value right on the meter
∿ [Improvements] - PDF reports are built faster and reused when nothing has changed
∿ [Improvements] - Reports for the running session now include the audio recording
∿ [Improvements] - "Running in background" is now off by default on new installs
∿ [Improvements] - Refreshed look on iOS 26 and iOS 27, and support for the newest devices
∿ [Fixes] - Fix crashes when starting a measurement with Siri, and when leaving the app
∿ [Fixes] - Fix recordings saved through Siri or Shortcuts coming out without audio
∿ [Fixes] - Fix "Stop measuring" telling you it had already stopped while it was still running
∿ [Fixes] - Fix the meter showing a wrong duration, and Reset not clearing it
∿ [Fixes] - Fix deleting several recordings at once leaving their files behind
∿ [Fixes] - Several other minor tweaks & bug fixes
What to expect in upcoming versions:
∿ Support external or bluetooth mics
∿ Hearing test… more - 🔎Decibel X: dB Noise Meter, SLM reached #1 for “noise”iOS#1 in Taiwan search · popularity 38
- 📊Decibel X: dB Noise Meter, SLM passed 10M monthly usersiOSour estimate
- 🔎Decibel X: dB Noise Meter, SLM reached Top 10 for “meter”iOS#10 in Spain search · popularity 47
- 🔎Decibel X: dB Noise Meter, SLM reached Top 10 for “sounds”iOS#10 in Spain search · popularity 42
- 🆕Decibel X: dB Noise Meter, SLM first spotted by AppInsideriOS#82 in Top Free · Utilities · Japan
- 📦Decibel X: dB Noise Meter, SLM version 9.3.9Android∿ NEW: Calibration guide - check your microphone, see whether a quiet room reads sensibly, and learn how accurate phone measurements really are. On the Calibration screen.
∿ NEW: Search and filter recordings in the Data tab.
∿ IMPORTANT: Levels have changed. They now come from your microphone's rated sensitivity and may read higher than before. Re-check your calibration if you need exact figures.
∿ Faster startup, crash fixes and minor improvements.… more - 📦Decibel X: dB Noise Meter, SLM version 9.9.7iOSThanks for using Decibel X! Here's what's new for the version 9.9.7:
∿ [Fixes] - Camera: the dB readings and the graphs on the overlay now update smoothly along with the live video, instead of looking frozen
Previously in version 9.9.6:
∿ [New] - Siri & Shortcuts: run the app hands-free - start or stop measuring, save a recording, run the dosimeter, take a photo or record a video, create a PDF report, share a recording, change the weighting, set a noise alert and more
∿ [New] - Ask Siri what a term means ("What does TWA mean in Decibel X?") without opening the app
∿ [New] - Search your recordings in the Data tab - by name, note, location or date - or just ask Siri to find them
∿ [New] - Filter recordings by date: Today, last 7 or 30 days, or a custom range
∿ [New] - Swipe a recording to delete it, or drag one straight into Mail, Files or Notes
∿ [New] - Photos, videos and recordings now log the full street address instead of only the city
∿ [New] - The loud noise alert now shows its threshold value right on the meter
∿ [Improvements] - PDF reports are built faster and reused when nothing has changed
∿ [Improvements] - Reports for the running session now include the audio recording
∿ [Improvements] - "Running in background" is now off by default on new installs
∿ [Improvements] - Refreshed look on iOS 26 and iOS 27, and support for the newest devices
∿ [Fixes] - Fix crashes when starting a measurement with Siri, and when leaving the app
∿ [Fixes] - Fix recordings saved through Siri or Shortcuts coming out without audio
∿ [Fixes] - Fix "Stop measuring" telling you it had already stopped while it was still running
∿ [Fixes] - Fix the meter showing a wrong duration, and Reset not clearing it
∿ [Fixes] - Fix deleting several recordings at once leaving their files behind
∿ [Fixes] - Several other minor tweaks & bug fixes
What to expect in upcoming versions:
∿ Support external or bluetooth mics
∿ Hearing test… more - 🆕Decibel X: dB Noise Meter, SLM released on Google PlayAndroid
- 🆕Decibel X: dB Noise Meter, SLM released on the App StoreiOS
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
4.4 ★
28k ratings, both stores
Measured
Best rank now
#99
App Store · 
Utilities Grossing
Utilities GrossingMeasured
New ratings a week
555
▲ +183% vs the 2 weeks before
Measured
App Store
App details
App ID
448155923
Publisher
SkyPaw Co., Limited
Publisher country
Hong Kong
On the store since
Nov 2011
15 years on the store
Minimum OS
iOS 17.0+
iPhone XS and later
Devices
iPhone · iPad · Watch
Universal purchase
Content rating
4+
Languages
12
NL EN FR DE IT JA KO PT ZH ES ZH VI
Size
94 MB
Also listed in
Education
Google Play
App details
App ID
com.skypaw.decibel
Publisher
SkyPaw Co., Limited
Publisher country
Hong Kong
Content rating
Everyone
Decibel X: dB Noise Meter, SLM downloads & installs
Both stores, worldwide. Bands are open; exact numbers are free with an account.
| Store | Downloads / day | Lifetime installs |
|---|---|---|
| App Store | – | 100M+ |
| Google Play | – | 5M+ Measured |
| Total | – | 100M+ Confidence |
How this is calculated
App Store: chart positions and rating growth per country, anchored on its own Android downloads; lifetime from ratings worldwide × installs per rating. Google Play: the daily change in its exact install count. The total adds every store.
Where Decibel X: dB Noise Meter, SLM's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Business model: Ad-led
How Decibel X: dB Noise Meter, SLM makes money: subscriptions, one-off purchases and ads.
SubscriptionsIn-app purchasesAds · 11 ad networks
Subscriptions
/mo
of revenue
Ads
/mo
of revenue
Top in-app purchases · App Store US, most popular first
| 1 | Monthly Membership subscription | |
| 2 | Annual Membership subscription | |
| 3 | Weekly Membership subscription | |
| 4 | ITU-R 468, A, B, C Weightings | |
| 5 | Data Export |
Where it ranks now
Both stores, across every country we track.
| Store | Best rank | Charting in | US Top Free | US Top Grossing |
|---|---|---|---|---|
| App Store | #99 Utilities Grossing | 6 of 30 countries | – | – |
| Google Play | – | 0 of 23 countries | – | – |
Full chart lists: App Store · Google Play.
Review momentum
ⓘ How we measure thisNew ratings a week
555
▲ +183% vs the 2 weeks before
Lifetime rating
4.6★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
91/100
faster than 97% of Utilities apps
Growing fastest in 
United States ▲ ×11+
New ratings by country (10)
| Country | New ratings a week | Share | Last 2 weeks vs the 2 before |
|---|---|---|---|
| United States | 254 | 46% | ▲ ×11+ |
 Germany | 84 | 15% | ▼ -6% |
| France | 55 | 10% | ▼ -17% |
 Japan | 37 | 7% | ▼ -16% |
 United Kingdom | 31 | 6% | ▲ +23% |
 Canada | 30 | 5% | ▲ +11% |
 India | 24 | 4% | – |
 Australia | 23 | 4% | ▲ +11% |
 Italy | 12 | 2% | – |
 South Korea | 5.5 | 1% | ▼ -40% |
App Store ratings in the countries we track, 4-week average.
Review momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
Ratings
Both stores. Store data, measured.
| Store | Rating | Ratings |
|---|---|---|
| App Store | 4.5 ★ | 15k |
| Google Play | 4.1 ★ | 13k 702 written reviews |
| Both stores | 4.4 ★ weighted by ratings | 28k |
About Decibel X: dB Noise Meter, SLM
"Decibel X" is one of very few noise meter apps on the market that has highly reliable, pre-calibrated measurements and supports dBA, dBC. It turns your iOS device into a professional sound level meter, precisely measures the sound pressure level (SPL) all around you. This extremely useful and beautiful tool will not only be a great tool for many uses but also bring you a lot of fun. Have you wondered how quiet is your room or how loud is a rock concert or sport event? "Decibel X" will help you answer all of those.
WHAT MAKE IT GREAT AND STAND OUT FROM OTHER APPS:
- Trusted accuracy: the app is tested and pre calibrated for all Apple devices. The precision is matching with real SPL devices
- Apple Watch support: see noise level right from your wrist
- Health App integration: export noise levels directly into Health app
- Frequency weighting filters: ITU-R 468, A, B, C, Z
- Powerful, smart history data management:
+ Recording data can be saved into a list of history records for future access and analysis
+ Each record can be exported as hi-res PNG graph or CSV text via sharing services
+ iCloud support which synchronize all history records across your Apple devices
+ Fullscreen mode to give overview the whole history of an record
- Dosimeter with NIOSH, OSHA standards
- Powerful calibration: Linear, Octave 1/1, 1/3, Load/save profile
- FFT and BAR graphs to display real time FFT. Those are very useful for frequency analysis and musical tests. Real time predominant frequency is also displayed.
- InstaDecibel to capture your dB report overlaid on photos and easily shared via popular social networks (Facebook, Instagram, Messages, etc.).
- Support Live Activity, Dynamic Island
- Support both Portrait and Landscape layouts
- Beautiful, intuitive and carefully crafted UI design. Themes: LIGHT, DARK and CLASSIC
OTHER GREAT FEATURES:
- Standard time weightings (Response Time): SLOW (500 milliseconds), FAST (200 milliseconds) AND IMPULSE (50 milliseconds)
- MIC Gain Offset from -50 dB to 50 dB
- Standard measurement range from 30 dBA up to 130 dBA
- HISTO graph for plotted history of the recorded values
- WAVE graph with 2 display modes: Rolling & Buffer
- SPECTROGRAPH
- Real time scale level chart
- Display Current, Average/Leq, and Max values with both nice and clear digital and analog layouts
- Quick reference text to help you compare with real-life examples
NOTES:
- Please do not expect a quiet room reading will be 0 dBA. The range 30-130 dBA is the standard usable range and an average quiet room will be about 30 dBA.
- Although all devices are pre-calibrated, custom calibration is suggested for serious purposes requiring higher precision and accuracy. You will need a real external device or calibrated sound meter as a reference, then adjust the trimming calibration until the reading matches with the reference.
* Privacy Policy: http://www.skypaw.com/decibelx/privacy_policy.html
* EULA: http://www.skypaw.com/decibelx/terms.html
WHAT MAKE IT GREAT AND STAND OUT FROM OTHER APPS:
- Trusted accuracy: the app is tested and pre calibrated for all Apple devices. The precision is matching with real SPL devices
- Apple Watch support: see noise level right from your wrist
- Health App integration: export noise levels directly into Health app
- Frequency weighting filters: ITU-R 468, A, B, C, Z
- Powerful, smart history data management:
+ Recording data can be saved into a list of history records for future access and analysis
+ Each record can be exported as hi-res PNG graph or CSV text via sharing services
+ iCloud support which synchronize all history records across your Apple devices
+ Fullscreen mode to give overview the whole history of an record
- Dosimeter with NIOSH, OSHA standards
- Powerful calibration: Linear, Octave 1/1, 1/3, Load/save profile
- FFT and BAR graphs to display real time FFT. Those are very useful for frequency analysis and musical tests. Real time predominant frequency is also displayed.
- InstaDecibel to capture your dB report overlaid on photos and easily shared via popular social networks (Facebook, Instagram, Messages, etc.).
- Support Live Activity, Dynamic Island
- Support both Portrait and Landscape layouts
- Beautiful, intuitive and carefully crafted UI design. Themes: LIGHT, DARK and CLASSIC
OTHER GREAT FEATURES:
- Standard time weightings (Response Time): SLOW (500 milliseconds), FAST (200 milliseconds) AND IMPULSE (50 milliseconds)
- MIC Gain Offset from -50 dB to 50 dB
- Standard measurement range from 30 dBA up to 130 dBA
- HISTO graph for plotted history of the recorded values
- WAVE graph with 2 display modes: Rolling & Buffer
- SPECTROGRAPH
- Real time scale level chart
- Display Current, Average/Leq, and Max values with both nice and clear digital and analog layouts
- Quick reference text to help you compare with real-life examples
NOTES:
- Please do not expect a quiet room reading will be 0 dBA. The range 30-130 dBA is the standard usable range and an average quiet room will be about 30 dBA.
- Although all devices are pre-calibrated, custom calibration is suggested for serious purposes requiring higher precision and accuracy. You will need a real external device or calibrated sound meter as a reference, then adjust the trimming calibration until the reading matches with the reference.
* Privacy Policy: http://www.skypaw.com/decibelx/privacy_policy.html
* EULA: http://www.skypaw.com/decibelx/terms.html
Decibel X: dB Noise Meter, SLM App Store
Decibel X: dB Noise Meter, SLM is #106 in Utilities Free in Germany and charting in 6 of 30 countries we track.
Updated 9 Nov 2026 · rankings refresh through the day
DeveloperSkyPaw Co., Limited
CategoryUtilities
PriceFree
Released
Rating★ 4.5 (15k)
Version9.9.9
Age rating4+
First seen by us 25 Sep 2026
25 Sep 2026Installs (est.)100M+ worldwide
Rating
4.5 ★
15k ratings
Measured
Best rank now
#106
Utilities FreeMeasured
New ratings a week
555
▲ +183% vs the 2 weeks before
Measured
Decibel X: dB Noise Meter, SLM on the App Store
App details
App ID
448155923
Publisher
SkyPaw Co., Limited
Publisher country
Hong Kong
On the store since
Nov 2011
15 years on the store
Minimum OS
iOS 17.0+
iPhone XS and later
Devices
iPhone · iPad · Watch
Universal purchase
Content rating
4+
Languages
12
NL EN FR DE IT JA KO PT ZH ES ZH VI
Size
94 MB
Also listed in
Education
Decibel X: dB Noise Meter, SLM downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. App Store downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Where Decibel X: dB Noise Meter, SLM's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Business model: Ad-led
How Decibel X: dB Noise Meter, SLM makes money: subscriptions, one-off purchases and ads.
SubscriptionsIn-app purchasesAds · 11 ad networks
Subscriptions
/mo
of revenue
Ads
/mo
of revenue
Top in-app purchases · App Store US, most popular first
| 1 | Monthly Membership subscription | |
| 2 | Annual Membership subscription | |
| 3 | Weekly Membership subscription | |
| 4 | ITU-R 468, A, B, C Weightings | |
| 5 | Data Export |
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Germany | UtilitiesFree | #106 |
| France | UtilitiesGrossing | #99 |
| United Kingdom | UtilitiesFree | #193 |
| South Korea | UtilitiesFree | #177 |
| France | UtilitiesFree | #153 |
| Canada | UtilitiesFree | #149 |
| Australia | UtilitiesFree | #177 |
Apps near Decibel X: dB Noise Meter, SLM on the chart
Utilities Free, around #106.
Ratings
App Store, worldwide.
Rating
4.5 ★
15k ratings
Measured
Ratings
15k
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
555
▲ +183% vs the 2 weeks before
Lifetime rating
4.6★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
91/100
faster than 97% of Utilities apps
Growing fastest in United States ▲ ×11+
New ratings by country (10)
| Country | New ratings a week | Share | Last 2 weeks vs the 2 before |
|---|---|---|---|
| United States | 254 | 46% | ▲ ×11+ |
| Germany | 84 | 15% | ▼ -6% |
| France | 55 | 10% | ▼ -17% |
| Japan | 37 | 7% | ▼ -16% |
| United Kingdom | 31 | 6% | ▲ +23% |
| Canada | 30 | 5% | ▲ +11% |
| India | 24 | 4% | – |
| Australia | 23 | 4% | ▲ +11% |
| Italy | 12 | 2% | – |
| South Korea | 5.5 | 1% | ▼ -40% |
App Store ratings in the countries we track, 4-week average.
Review momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
About Decibel X: dB Noise Meter, SLM
"Decibel X" is one of very few noise meter apps on the market that has highly reliable, pre-calibrated measurements and supports dBA, dBC. It turns your iOS device into a professional sound level meter, precisely measures the sound pressure level (SPL) all around you. This extremely useful and beautiful tool will not only be a great tool for many uses but also bring you a lot of fun. Have you wondered how quiet is your room or how loud is a rock concert or sport event? "Decibel X" will help you answer all of those.
WHAT MAKE IT GREAT AND STAND OUT FROM OTHER APPS:
- Trusted accuracy: the app is tested and pre calibrated for all Apple devices. The precision is matching with real SPL devices
- Apple Watch support: see noise level right from your wrist
- Health App integration: export noise levels directly into Health app
- Frequency weighting filters: ITU-R 468, A, B, C, Z
- Powerful, smart history data management:
+ Recording data can be saved into a list of history records for future access and analysis
+ Each record can be exported as hi-res PNG graph or CSV text via sharing services
+ iCloud support which synchronize all history records across your Apple devices
+ Fullscreen mode to give overview the whole history of an record
- Dosimeter with NIOSH, OSHA standards
- Powerful calibration: Linear, Octave 1/1, 1/3, Load/save profile
- FFT and BAR graphs to display real time FFT. Those are very useful for frequency analysis and musical tests. Real time predominant frequency is also displayed.
- InstaDecibel to capture your dB report overlaid on photos and easily shared via popular social networks (Facebook, Instagram, Messages, etc.).
- Support Live Activity, Dynamic Island
- Support both Portrait and Landscape layouts
- Beautiful, intuitive and carefully crafted UI design. Themes: LIGHT, DARK and CLASSIC
OTHER GREAT FEATURES:
- Standard time weightings (Response Time): SLOW (500 milliseconds), FAST (200 milliseconds) AND IMPULSE (50 milliseconds)
- MIC Gain Offset from -50 dB to 50 dB
- Standard measurement range from 30 dBA up to 130 dBA
- HISTO graph for plotted history of the recorded values
- WAVE graph with 2 display modes: Rolling & Buffer
- SPECTROGRAPH
- Real time scale level chart
- Display Current, Average/Leq, and Max values with both nice and clear digital and analog layouts
- Quick reference text to help you compare with real-life examples
NOTES:
- Please do not expect a quiet room reading will be 0 dBA. The range 30-130 dBA is the standard usable range and an average quiet room will be about 30 dBA.
- Although all devices are pre-calibrated, custom calibration is suggested for serious purposes requiring higher precision and accuracy. You will need a real external device or calibrated sound meter as a reference, then adjust the trimming calibration until the reading matches with the reference.
* Privacy Policy: http://www.skypaw.com/decibelx/privacy_policy.html
* EULA: http://www.skypaw.com/decibelx/terms.html
WHAT MAKE IT GREAT AND STAND OUT FROM OTHER APPS:
- Trusted accuracy: the app is tested and pre calibrated for all Apple devices. The precision is matching with real SPL devices
- Apple Watch support: see noise level right from your wrist
- Health App integration: export noise levels directly into Health app
- Frequency weighting filters: ITU-R 468, A, B, C, Z
- Powerful, smart history data management:
+ Recording data can be saved into a list of history records for future access and analysis
+ Each record can be exported as hi-res PNG graph or CSV text via sharing services
+ iCloud support which synchronize all history records across your Apple devices
+ Fullscreen mode to give overview the whole history of an record
- Dosimeter with NIOSH, OSHA standards
- Powerful calibration: Linear, Octave 1/1, 1/3, Load/save profile
- FFT and BAR graphs to display real time FFT. Those are very useful for frequency analysis and musical tests. Real time predominant frequency is also displayed.
- InstaDecibel to capture your dB report overlaid on photos and easily shared via popular social networks (Facebook, Instagram, Messages, etc.).
- Support Live Activity, Dynamic Island
- Support both Portrait and Landscape layouts
- Beautiful, intuitive and carefully crafted UI design. Themes: LIGHT, DARK and CLASSIC
OTHER GREAT FEATURES:
- Standard time weightings (Response Time): SLOW (500 milliseconds), FAST (200 milliseconds) AND IMPULSE (50 milliseconds)
- MIC Gain Offset from -50 dB to 50 dB
- Standard measurement range from 30 dBA up to 130 dBA
- HISTO graph for plotted history of the recorded values
- WAVE graph with 2 display modes: Rolling & Buffer
- SPECTROGRAPH
- Real time scale level chart
- Display Current, Average/Leq, and Max values with both nice and clear digital and analog layouts
- Quick reference text to help you compare with real-life examples
NOTES:
- Please do not expect a quiet room reading will be 0 dBA. The range 30-130 dBA is the standard usable range and an average quiet room will be about 30 dBA.
- Although all devices are pre-calibrated, custom calibration is suggested for serious purposes requiring higher precision and accuracy. You will need a real external device or calibrated sound meter as a reference, then adjust the trimming calibration until the reading matches with the reference.
* Privacy Policy: http://www.skypaw.com/decibelx/privacy_policy.html
* EULA: http://www.skypaw.com/decibelx/terms.html
Latest updates
9.9.9
Thanks for using Decibel X! Here's what's new for the version 9.9.9:
∿ [Improvements] - iPhone Duo and iPad: every screen except the Camera now rotates to all four orientations
∿ [Fixes] - Fix the Camera preview is rotated 90 degrees on iPhone Duo
∿ [Fixes] - Fix the "Premium activated" screen popping up every time the app is opened by a subscriber
∿ [Fixes] - Several other minor tweaks & bug fixes
What to expect in upcoming versions:
∿ Support external or bluetooth mics
∿ Hearing test
9.9.8
Thanks for using Decibel X! Here's what's new for the version 9.9.8:
∿ [New] - Full support for the iPhone Duo
Previously in version 9.9.7:
∿ [Fixes] - Camera: the dB readings and the graphs on the overlay now update smoothly along with the live video, instead of looking frozen
Previously in version 9.9.6:
∿ [New] - Siri & Shortcuts: run the app hands-free - start or stop measuring, save a recording, run the dosimeter, take a photo or record a video, create a PDF report, share a recording, change the weighting, set a noise alert and more
∿ [New] - Ask Siri what a term means ("What does TWA mean in Decibel X?") without opening the app
∿ [New] - Search your recordings in the Data tab - by name, note, location or date - or just ask Siri to find them
∿ [New] - Filter recordings by date: Today, last 7 or 30 days, or a custom range
∿ [New] - Swipe a recording to delete it, or drag one straight into Mail, Files or Notes
∿ [New] - Photos, videos and recordings now log the full street address instead of only the city
∿ [New] - The loud noise alert now shows its threshold value right on the meter
∿ [Improvements] - PDF reports are built faster and reused when nothing has changed
∿ [Improvements] - Reports for the running session now include the audio recording
∿ [Improvements] - "Running in background" is now off by default on new installs
∿ [Improvements] - Refreshed look on iOS 26 and iOS 27, and support for the newest devices
∿ [Fixes] - Fix crashes when starting a measurement with Siri, and when leaving the app
∿ [Fixes] - Fix recordings saved through Siri or Shortcuts coming out without audio
∿ [Fixes] - Fix "Stop measuring" telling you it had already stopped while it was still running
∿ [Fixes] - Fix the meter showing a wrong duration, and Reset not clearing it
∿ [Fixes] - Fix deleting several recordings at once leaving their files behind
∿ [Fixes] - Several other minor tweaks & bug fixes
What to expect in upcoming versions:
∿ Support external or bluetooth mics
∿ Hearing test
9.9.7
Thanks for using Decibel X! Here's what's new for the version 9.9.7:
∿ [Fixes] - Camera: the dB readings and the graphs on the overlay now update smoothly along with the live video, instead of looking frozen
Previously in version 9.9.6:
∿ [New] - Siri & Shortcuts: run the app hands-free - start or stop measuring, save a recording, run the dosimeter, take a photo or record a video, create a PDF report, share a recording, change the weighting, set a noise alert and more
∿ [New] - Ask Siri what a term means ("What does TWA mean in Decibel X?") without opening the app
∿ [New] - Search your recordings in the Data tab - by name, note, location or date - or just ask Siri to find them
∿ [New] - Filter recordings by date: Today, last 7 or 30 days, or a custom range
∿ [New] - Swipe a recording to delete it, or drag one straight into Mail, Files or Notes
∿ [New] - Photos, videos and recordings now log the full street address instead of only the city
∿ [New] - The loud noise alert now shows its threshold value right on the meter
∿ [Improvements] - PDF reports are built faster and reused when nothing has changed
∿ [Improvements] - Reports for the running session now include the audio recording
∿ [Improvements] - "Running in background" is now off by default on new installs
∿ [Improvements] - Refreshed look on iOS 26 and iOS 27, and support for the newest devices
∿ [Fixes] - Fix crashes when starting a measurement with Siri, and when leaving the app
∿ [Fixes] - Fix recordings saved through Siri or Shortcuts coming out without audio
∿ [Fixes] - Fix "Stop measuring" telling you it had already stopped while it was still running
∿ [Fixes] - Fix the meter showing a wrong duration, and Reset not clearing it
∿ [Fixes] - Fix deleting several recordings at once leaving their files behind
∿ [Fixes] - Several other minor tweaks & bug fixes
What to expect in upcoming versions:
∿ Support external or bluetooth mics
∿ Hearing test
Store changes
What Decibel X: dB Noise Meter, SLM changed on its store page: name, icon, screenshots, price, size, languages, requirements.
New screenshots
8 screenshots (was 8)
New iPad screenshots
New screenshots
8 screenshots (was 8)
More from SkyPaw Co., Limited
Decibel X - Pro Sound Meter Android
Not in a tracked Google Play top chart right now.
Updated 9 Nov 2026 · rankings refresh through the day
DeveloperSkyPaw Co., Limited
CategoryTools
PriceFree
Released
Installs5M+
Rating★ 4.1 (13k)
Updated
Content ratingEveryone
Rating
4.1 ★
13k ratings
Measured
Decibel X - Pro Sound Meter on Google Play
App details
App ID
com.skypaw.decibel
Publisher
SkyPaw Co., Limited
Publisher country
Hong Kong
Content rating
Everyone
Decibel X - Pro Sound Meter downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Google Play shows an exact lifetime install count; downloads per day are its daily change (measured). When Play hasn't refreshed the count, they come from new ratings and Top Free chart positions. Confidence is the chance the real number is within half to double ours.
Where Decibel X - Pro Sound Meter's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Business model: Ad-led
How Decibel X - Pro Sound Meter makes money: subscriptions, one-off purchases and ads.
SubscriptionsIn-app purchasesAds · 11 ad networks
Subscriptions
/mo
of revenue
Ads
/mo
of revenue
Top in-app purchases · App Store US, most popular first
| 1 | Monthly Membership subscription | |
| 2 | Annual Membership subscription | |
| 3 | Weekly Membership subscription | |
| 4 | ITU-R 468, A, B, C Weightings | |
| 5 | Data Export |
Where it ranks on Google Play
Every top 200 chart it appears in across 23 countries.
| Country | Charts | Rank |
|---|---|---|
| Not in a Google Play top chart right now. | ||
Ratings
Google Play, worldwide.
Rating
4.1 ★
13k ratings
Measured
Ratings
13k
Measured
Written reviews
702
Measured
About Decibel X - Pro Sound Meter
"Decibel X" is one of very few sound meter apps on the market that has highly reliable, pre-calibrated measurements and supports frequency weightings: ITU-R 468, A and C. It turns your phone device into a professional sound meter, precisely measures the sound pressure level (SPL) all around you. This extremely useful and beautiful sound meter tool will not only be an essential gadget for many uses but also bring you a lot of fun. Have you wondered how quiet is your room or how loud is a rock concert or sport event? "Decibel X" will help you answer all of those.
WHAT MAKES "DECIBEL X" SPECIAL:
- Trusted accuracy: the app is carefully tested and calibrated for most devices. The precision is matching with real SPL devices
- Frequency weighting filters: ITU-R 468, A, B, C, Z
- Spectrum analyzer: FFT and BAR graphs to display real time FFT. Those are very useful for frequency analysis and musical tests. Real time predominant frequency is also displayed.
- Powerful, smart history data management:
+ Recording data can be saved into a list of history records for future access and analysis
+ Each record can be exported as hi-res PNG graph or CSV text via sharing services
+ Fullscreen mode to give overview the whole history of an record
- Dosimeter: NIOSH, OSHA standards
- InstaDecibel to capture your dB report overlaid on photos and easily shared via popular social networks (Facebook, Instagram, etc.).
- Beautiful, intuitive and carefully crafted UI design
OTHER FEATURES:
- Standard time weightings (Response Time): SLOW (500 milliseconds), FAST (200 milliseconds) and IMPULSE (50 milliseconds)
- Trimming calibration from -50 dB to 50 dB
- Standard measurement range from 20 dBA up to 130 dBA
- Spectrogram
- HISTO graph for plotted history of the recorded values
- WAVE graph with 2 display modes: Rolling & Buffer
- Real time scale level chart
- Display Current, Average/Leq, and Max values with both nice and clear digital and analog layouts
- Quick reference text to help you compare with real-life examples
- "Keep Device Stay Awake" option for long duration recording
- Reset and clear current recording at any time
- Pause/Resume at any time
NOTES:
- Please do not expect a quiet room reading will be 0 dBA. The range 30 dBA - 130 dBA is the standard usable range and an average quiet room will be about 30 dBA.
- Although most devices are pre-calibrated, custom calibration is suggested for serious purposes requiring higher precision and accuracy. To calibrate, you will need a real external device or calibrated sound meter as a reference, then adjust the trimming value until the reading matches with the reference.
If you like it or have suggestions, please support us by rating and giving us comments and feedback.
WHAT MAKES "DECIBEL X" SPECIAL:
- Trusted accuracy: the app is carefully tested and calibrated for most devices. The precision is matching with real SPL devices
- Frequency weighting filters: ITU-R 468, A, B, C, Z
- Spectrum analyzer: FFT and BAR graphs to display real time FFT. Those are very useful for frequency analysis and musical tests. Real time predominant frequency is also displayed.
- Powerful, smart history data management:
+ Recording data can be saved into a list of history records for future access and analysis
+ Each record can be exported as hi-res PNG graph or CSV text via sharing services
+ Fullscreen mode to give overview the whole history of an record
- Dosimeter: NIOSH, OSHA standards
- InstaDecibel to capture your dB report overlaid on photos and easily shared via popular social networks (Facebook, Instagram, etc.).
- Beautiful, intuitive and carefully crafted UI design
OTHER FEATURES:
- Standard time weightings (Response Time): SLOW (500 milliseconds), FAST (200 milliseconds) and IMPULSE (50 milliseconds)
- Trimming calibration from -50 dB to 50 dB
- Standard measurement range from 20 dBA up to 130 dBA
- Spectrogram
- HISTO graph for plotted history of the recorded values
- WAVE graph with 2 display modes: Rolling & Buffer
- Real time scale level chart
- Display Current, Average/Leq, and Max values with both nice and clear digital and analog layouts
- Quick reference text to help you compare with real-life examples
- "Keep Device Stay Awake" option for long duration recording
- Reset and clear current recording at any time
- Pause/Resume at any time
NOTES:
- Please do not expect a quiet room reading will be 0 dBA. The range 30 dBA - 130 dBA is the standard usable range and an average quiet room will be about 30 dBA.
- Although most devices are pre-calibrated, custom calibration is suggested for serious purposes requiring higher precision and accuracy. To calibrate, you will need a real external device or calibrated sound meter as a reference, then adjust the trimming value until the reading matches with the reference.
If you like it or have suggestions, please support us by rating and giving us comments and feedback.
What's new in 9.3.9
∿ NEW: Calibration guide - check your microphone, see whether a quiet room reads sensibly, and learn how accurate phone measurements really are. On the Calibration screen.
∿ NEW: Search and filter recordings in the Data tab.
∿ IMPORTANT: Levels have changed. They now come from your microphone's rated sensitivity and may read higher than before. Re-check your calibration if you need exact figures.
∿ Faster startup, crash fixes and minor improvements.
∿ NEW: Search and filter recordings in the Data tab.
∿ IMPORTANT: Levels have changed. They now come from your microphone's rated sensitivity and may read higher than before. Re-check your calibration if you need exact figures.
∿ Faster startup, crash fixes and minor improvements.