Lux Light Meter · Photometer Downloads & RevenueLux Light Meter · Photometer · App Store
Not in any tracked top chart right now.
Updated 11 Nov 2026 · rankings refresh through the day
DeveloperKyu-Hee Jang
CategoryUtilities
PriceFree
Released
Rating★ 4.3 (7)
Version1.0.39
Age rating17+
First seen by us
23 Oct 2026
23 Oct 2026Installs (est.)10k+ worldwide
Lux Light Meter · Photometer update history & changes
Last change · 11 events since 3 Mar 2026Full timeline ↓📦Updated to version 1.0.41📦Updated to version 1.0.40🆕First spotted by AppInsider🆕Released on the App Store
Full timeline · 11 events
- 📦Lux Light Meter · Photometer updated to version 1.0.41New Tools tab with a window tint check: aim the back camera out through the open window, then through the closed glass with the phone flat on it, and Lux Light Meter estimates how much light the glass lets through (VLT %). Standard mode repeats the pair and flags moving clouds, shaking and a changed angle; compare with the minimum % you enter and save the result per window. Reference only, not an official tint meter. History buttons are easier to tap.… more
- 📦Lux Light Meter · Photometer updated to version 1.0.40• In Lux Light Meter, Log on the Meter tab now keeps running when you switch to History, Standards or Guide: the points already recorded stay, and new ones are added every second while the meter measures.
• After you stop Log, "Export CSV (n)" is still there when you come back to the Meter tab.
• The mode and unit chips, Hold and the menu button have larger touch areas.… more - ✏️Lux Light Meter · Photometer: app got bigger58 MB → 88 MB (+50%)
- 📦Lux Light Meter · Photometer updated to version 1.0.39• Right after installing, Lux Light Meter's first launch reaches the live lux reading on the Meter tab with less waiting.
• Plant check, Room Survey and History are the same as before, with a few reliability touch-ups.
• Every saved reading and setting is kept exactly as it was.… more - 📦Lux Light Meter · Photometer updated to version 1.0.38• Lux Light Meter now gets to the light reading with fewer requests going at the same time while it opens; anything it needs only later is fetched once you start using the app.
• The Meter tab, Plant check and your History records work just as before.
• Lux Light Meter has been rebuilt on a newer foundation, and where privacy choices apply in your region you can reopen them from the menu.
• Lux Light Meter now picks up the bottom bar area's settings as soon as they arrive on a slow first launch and keeps retrying about once a minute instead of giving up for the session.… more - 📦Lux Light Meter · Photometer: now updating weekly4 updates in 30 days, after a quiet two months
- 📦Lux Light Meter · Photometer updated to version 1.0.36• First launch: while you answer the privacy choices or the tracking question, the opening screen now waits for you instead of using up its loading time.
• Later launches: Lux Light Meter leaves the opening screen sooner.… more - 📦Lux Light Meter · Photometer updated to version 1.0.35• New Plant check: pick what light your plant likes and hold the phone still for 5 seconds. You see whether this spot is darker than, within or brighter than the typical range right now. Name the spot and save it to History; earlier checks of the same spot are listed.
• While the meter is running, an empty History now offers "Save · 420 lx" to keep the current reading. The meter keeps running.
• A tip under the meter shows where the reading comes from: the back camera, so point it toward the light. Export CSV now includes notes and plant results.… more - 🆕Lux Light Meter · Photometer first spotted by AppInsiderUnited States (found via developer)
- 📦Lux Light Meter · Photometer version 1.0.34• New app icon: the same picture as on the store page – a large white-and-amber sun with thin rays on a warm black tile, edge to edge. Before, a smaller sun sat inside a dark frame.
• The start screen uses it too. Meter, History and your saved readings stay as they were.… more - 🆕Lux Light Meter · Photometer released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
4.3 ★
7 ratings
Measured
Lux Light Meter · Photometer on the App Store
App details
App ID
6759858193
Publisher
Kyu-Hee Jang
On the store since
Mar 2026
Under a year
Minimum OS
iOS 16.4+
iPhone 8 and later
Devices
iPhone · iPad
Content rating
17+
Languages
1
EN
Size
88 MB
Also listed in
Productivity
Lux Light Meter · Photometer 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.
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.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
4.3 ★
7 ratings
Measured
Ratings
7
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
under 1
4-week average
Lifetime rating
4.3★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
20/100
faster than 0% of Utilities apps
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 Lux Light Meter · Photometer
Measure light properly — in lux, foot-candles, EV, or PPFD for plants — using your iPhone's camera to read the light falling on the scene.
GROW LIGHTS & PLANTS
• PPFD estimated from your live reading, matched to your light source: white LED, HPS, fluorescent or daylight
• DLI for a 12, 14, 16 or 18 hour photoperiod, so you can tell whether a shelf actually reaches a seedling's daily light target
• These are spectrum-based estimates, not a calibrated PAR sensor. Read them as guidance for placing lights, not as lab data.
FOUR MEASURING MODES
• Auto — radial gauge with the closest real-world reference shown live
• Outdoor — a log scale to 100,000 lx, from deep twilight through overcast and direct sun
• Indoor — 10 to 10,000 lx, from corridor and living room up to reading desk, drafting and surgical levels
• Photo — EV at ISO 100 with a suggested shutter speed
HISTORY THAT ADDS UP
• Every reading saves automatically, with a 7-day trend chart and plain-language insight such as "+12% vs your 7-day average"
• Notes and favourites — label a reading "kitchen window 3pm" and star it
• Compare any two saved readings side by side
• Export everything as CSV, or share a single reading as an image
MEASUREMENT DETAIL
• Kalman-smoothed readings, so there is no jitter to read through
• Min, max and average with elapsed time
• Log-scale range bar in Outdoor and Indoor modes
• Lux, foot-candle and EV units
• Calibration factor — scale every reading by a multiplier to match a reference meter you trust
WHO USES IT
Indoor gardeners and grow-tent owners · photographers and filmmakers · electricians and lighting installers · studio engineers · workplace and office ergonomics checks · industrial lighting surveys
HOW IT WORKS
Readings are estimated from the back camera's exposure, so this is a reflected-light measurement: point the back of the phone at the surface you care about and keep the lens clean and unshaded. Because it reads reflected light, a white wall and a dark carpet under identical lighting will not read the same, and very dim scenes are the least reliable. Cameras differ between models, so for absolute numbers set the calibration factor against a meter you trust.
Available in 25 languages.
GROW LIGHTS & PLANTS
• PPFD estimated from your live reading, matched to your light source: white LED, HPS, fluorescent or daylight
• DLI for a 12, 14, 16 or 18 hour photoperiod, so you can tell whether a shelf actually reaches a seedling's daily light target
• These are spectrum-based estimates, not a calibrated PAR sensor. Read them as guidance for placing lights, not as lab data.
FOUR MEASURING MODES
• Auto — radial gauge with the closest real-world reference shown live
• Outdoor — a log scale to 100,000 lx, from deep twilight through overcast and direct sun
• Indoor — 10 to 10,000 lx, from corridor and living room up to reading desk, drafting and surgical levels
• Photo — EV at ISO 100 with a suggested shutter speed
HISTORY THAT ADDS UP
• Every reading saves automatically, with a 7-day trend chart and plain-language insight such as "+12% vs your 7-day average"
• Notes and favourites — label a reading "kitchen window 3pm" and star it
• Compare any two saved readings side by side
• Export everything as CSV, or share a single reading as an image
MEASUREMENT DETAIL
• Kalman-smoothed readings, so there is no jitter to read through
• Min, max and average with elapsed time
• Log-scale range bar in Outdoor and Indoor modes
• Lux, foot-candle and EV units
• Calibration factor — scale every reading by a multiplier to match a reference meter you trust
WHO USES IT
Indoor gardeners and grow-tent owners · photographers and filmmakers · electricians and lighting installers · studio engineers · workplace and office ergonomics checks · industrial lighting surveys
HOW IT WORKS
Readings are estimated from the back camera's exposure, so this is a reflected-light measurement: point the back of the phone at the surface you care about and keep the lens clean and unshaded. Because it reads reflected light, a white wall and a dark carpet under identical lighting will not read the same, and very dim scenes are the least reliable. Cameras differ between models, so for absolute numbers set the calibration factor against a meter you trust.
Available in 25 languages.
Latest updates
1.0.41
New Tools tab with a window tint check: aim the back camera out through the open window, then through the closed glass with the phone flat on it, and Lux Light Meter estimates how much light the glass lets through (VLT %). Standard mode repeats the pair and flags moving clouds, shaking and a changed angle; compare with the minimum % you enter and save the result per window. Reference only, not an official tint meter. History buttons are easier to tap.
1.0.40
• In Lux Light Meter, Log on the Meter tab now keeps running when you switch to History, Standards or Guide: the points already recorded stay, and new ones are added every second while the meter measures.
• After you stop Log, "Export CSV (n)" is still there when you come back to the Meter tab.
• The mode and unit chips, Hold and the menu button have larger touch areas.
1.0.39
• Right after installing, Lux Light Meter's first launch reaches the live lux reading on the Meter tab with less waiting.
• Plant check, Room Survey and History are the same as before, with a few reliability touch-ups.
• Every saved reading and setting is kept exactly as it was.
Store changes
What Lux Light Meter · Photometer changed on its store page: name, icon, screenshots, price, size, languages, requirements.
App got bigger
58 MB → 88 MB (+50%)
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