RapidExposure Downloads & RevenueRapidExposure · App Store
連続露出計
RapidExposure is #68 in Lifestyle Paid in Japan and charting in 1 of 30 countries we track.
Updated 9 Nov 2026 · rankings refresh through the day
DeveloperHIROFUMI MARUO
CategoryLifestyle
Price150 JPY
Released
Rating★ 3.4 (8)
Version2.2
Age rating4+
First seen by us
24 Sep 2026
24 Sep 2026Installs (est.)100+ worldwide
Full timeline · 2 events in the last 12 months
- 🆕RapidExposure first spotted by AppInsider#12 in Top Paid · Lifestyle · Japan
- 🆕RapidExposure 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
3.4 ★
8 ratings
Measured
Best rank now
#68
Lifestyle PaidMeasured
RapidExposure on the App Store
App details
App ID
839420903
Publisher
HIROFUMI MARUO
On the store since
Apr 2014
12 years on the store
Minimum OS
iOS 12.0+
iPhone 5s and later
Devices
iPhone · iPad
Content rating
4+
Languages
2
EN JA
Size
9 MB
Also listed in
Photo & Video
RapidExposure 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 RapidExposure'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.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Japan | LifestylePaid | #68 |
Apps near RapidExposure on the chart
Lifestyle Paid, around #68.
Ratings
App Store, worldwide.
Rating
3.4 ★
8 ratings
Measured
Ratings
8
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
under 1
4-week average
Lifetime rating
3.4★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
20/100
faster than 0% of Lifestyle 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 RapidExposure
This app will turn iPhone into exposure meter for cameras.
It can continuously measure exposure value and indicate the information without releasing the shutter.
It allows you to recalculate and indicate the shutter speed together with other ISO values and F values even during the measurement.
The measurement is interrupted by the save button, and then write a row exposure value which iPhone automatically set into the image that iPhone had been taking,
The image with the row exposure value is saved as a sample and displayed. It also displays the exposure value that the user has set.
You can see the saved images on a list of images in the history window.
You can adjust and rock the exposure on the tapped point of the preview screen.
The exposure rock can be cancelled by the 'Auto' button.
The shutter sound can be reduced by the volume button. However, it becomes the normal volume if it is set mute.
At first the app puts high priority on ISO and F in exposure calculation.
Under the exposure measurement, it indicates variable aperture stops (F-number) at a fixed shutter speed when you manually change the shutter speeds.
Or, when you manually change the aperture stops (F-numbers), it indicates variable shutter speeds at a fixed aperture stop.
If you change the ISO value, shutter speed or F-value changes depending on the mode at the time.
The range of ISO vales, F values and shutter speeds are as follows. (In the new version, detail display mode is added in which F,ISO,SS values are changed by 1/3 step)
ISO vales:
"25","50","100","200","400","800","1600","3200","6400","12800","25600","51200"
F values:
"F0.7", "F1", "F1.4", "F2", "F2.8","F4", "F5.6", "F8", "F11", "F16","F22", "F32"
shutter speeds:
"60","30","15","8","4","2","1","1/2","1/4","1/8","1/15","1/30","1/60","1/125","1/250","1/500","1/1000","1/2000","1/4000","1/8000"
********
How to use:
(1) Immediately after start-up, this application starts the exposure calculation automatically and it displays the values of ISO, F and SS in the wheel.
(2) Exposure is recalculated in accordance with the subject that is reflected in the camera, the value of the SS will change accordingly. When you point the camera toward bright, the value of SS is reduced. Turning the camera to darker, the value of the SS will increase.
(3) If you change the value of the ISO in the wheel, the value of the SS will change accordingly. Changing the value of F in the same manner, the value of the SS will change. Further, changing the value of the SS, the value of F will change.
(4) If you tap the "Save" button, the exposure value displayed at that time is locked and a photo is taken. A reference exposure value that iPhone camera set to itself is written in the photo. (The reference value is different from that displayed in the wheel. It is not possible to set exposure value in the wheel to iPhone camera itself.)
(5) If you tap the "measure" button, it restarts the exposure calculation and re-displays the values
It can continuously measure exposure value and indicate the information without releasing the shutter.
It allows you to recalculate and indicate the shutter speed together with other ISO values and F values even during the measurement.
The measurement is interrupted by the save button, and then write a row exposure value which iPhone automatically set into the image that iPhone had been taking,
The image with the row exposure value is saved as a sample and displayed. It also displays the exposure value that the user has set.
You can see the saved images on a list of images in the history window.
You can adjust and rock the exposure on the tapped point of the preview screen.
The exposure rock can be cancelled by the 'Auto' button.
The shutter sound can be reduced by the volume button. However, it becomes the normal volume if it is set mute.
At first the app puts high priority on ISO and F in exposure calculation.
Under the exposure measurement, it indicates variable aperture stops (F-number) at a fixed shutter speed when you manually change the shutter speeds.
Or, when you manually change the aperture stops (F-numbers), it indicates variable shutter speeds at a fixed aperture stop.
If you change the ISO value, shutter speed or F-value changes depending on the mode at the time.
The range of ISO vales, F values and shutter speeds are as follows. (In the new version, detail display mode is added in which F,ISO,SS values are changed by 1/3 step)
ISO vales:
"25","50","100","200","400","800","1600","3200","6400","12800","25600","51200"
F values:
"F0.7", "F1", "F1.4", "F2", "F2.8","F4", "F5.6", "F8", "F11", "F16","F22", "F32"
shutter speeds:
"60","30","15","8","4","2","1","1/2","1/4","1/8","1/15","1/30","1/60","1/125","1/250","1/500","1/1000","1/2000","1/4000","1/8000"
********
How to use:
(1) Immediately after start-up, this application starts the exposure calculation automatically and it displays the values of ISO, F and SS in the wheel.
(2) Exposure is recalculated in accordance with the subject that is reflected in the camera, the value of the SS will change accordingly. When you point the camera toward bright, the value of SS is reduced. Turning the camera to darker, the value of the SS will increase.
(3) If you change the value of the ISO in the wheel, the value of the SS will change accordingly. Changing the value of F in the same manner, the value of the SS will change. Further, changing the value of the SS, the value of F will change.
(4) If you tap the "Save" button, the exposure value displayed at that time is locked and a photo is taken. A reference exposure value that iPhone camera set to itself is written in the photo. (The reference value is different from that displayed in the wheel. It is not possible to set exposure value in the wheel to iPhone camera itself.)
(5) If you tap the "measure" button, it restarts the exposure calculation and re-displays the values
Latest updates
2.2
Fixed a display (picker) bug.
