Quick verdict
- What it is
- Store information collected; independent summary not yet available.
- At a glance
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- $1.99
- In-app purchases
Categories and search queries
Official categories
- Photo & Video
AppCorpus categories
Key functions
| Function | Availability | Access | Scope | Evidence |
|---|---|---|---|---|
| In-app purchases | Yes | Limited free | — | Store published |
Screens
App Store
11 store screenshots
Pricing & paywalls
App Store
Shown for US
- Price: $1.99
- Reciprocity Timer Pro — $9.99
Ratings & reviews
App Store
Shown for US
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4/5Finally
I've been waiting for a while for an app that combines the few features I look for such as reciprocity failure, filters, more importantly, the stacking of filters(which was difficult to find out) and bellows compensation. If it here was a way to add other reciprocity data, that would be great.
Doc Gmed · 6 Aug 2026
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5/5Only thing like it
Its a little ugly but gets the job done :)
Rustygee610610 · 6 Aug 2026
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5/5Has changed the game for me
As all of my lenses have speeds that are NOT true to their stated times, that had cause many years of frustration in attempts to get good exposures. I had purchased a shutter speed timer, and hand written the speed averages for each, but attempting to then mentally calculate exposure reciprocity? It was a nightmare. Then I hear of “Reciprocity Timer”. Now with the App enhancement of being able to enter my own shutter speeds, I have consistently taken good exposure photos time and time again.
Robert Frase · 6 Aug 2026
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1/5Good idea.. bad implementation
Have you guys actually used this app? Or did you just chuck it onto the App Store without even testing it?? Because that’s what it seems like for sure. I have yet to use a feature that doesn’t have bugs; if it even works at all. Did you notice the keyboard won’t minimize unless you have a particular text box in focus? Or that you have to select each film holder you create as you add them else the entire list will peace out into another dimension when you do select one? I could go on for an hour but I’m not your beta tester.. I’m unfortunately your customer. You need to take a serious look at your process.
Mischievous Mr C · 6 Aug 2026
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5/5Was good, not so much now
Keeps crashing or deleting custom settings. Tried contacting developer and got no response. UPDATE: app is working great now after a conversation with the developer. Sent him screen recordings and data to help him figure it out. App update was done in a few hours, approved by Apple and downloaded to my phone a couple hours later. It’s already helped me. Cheers.
BillPutnamPhoto · 6 Aug 2026
Privacy & accessibility
App Store
Privacy
- Data Not Collected Developer declared
Accessibility
No accessibility labels collected yet.
Versions
App Store
- 1.0
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1.1
Added new films including Velvia 100, Kodak TMY, TMX and Efke. The filter slider now includes a selector to allow you to set filter factors in 1/3, 1/2 or full stops. Added sliders for calculating and including compensation for bellows extension in exposure. Added Filter compensation and an editable list of common photographic filters. You can add multiple filters as required. Fixed volume control on sounds.
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1.2
Fixed a bug in the filter factor calculations. Fixed issue with editing and scrolling of filter table. Exposure controls are now disabled during countdown to prevent accidental changes.
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1.3
Added sub 1 second exposure times for those using stronger ND filters. The app now allows you to select a metered time under a second. Note that the timer will only operate for exposure times greater than 1 second.
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1.4
Added calculations Fomapan 100 and 200 Film. Added filter clear button on main view to allow for removing filters without navigating to filter page. Added small exposure time display (in standard notation) for sub 1 second exposures.
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1.5
Addresses a problem where the exposure timer would stop when device went to sleep resulting in incorrect timing.
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1.6
Added Big Stopper ND10 Filter to filters list. Added plus and minus buttons for fine focal length and bellows extension adjustments. Minor interface adjustments. Fixed a bug with notifications.
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2.0
This version is a complete refresh. It includes many new films as well as iOS7 compatibility. The new version allows users to upgrade to a pro edition that massively extends the features of the app. Pro features include: - Integrated equipment register - Integrated note keeping to keep track of locations, development requirements and other shooting data. - A built in Zone System editor - Ability to print and email notes as PDF and CSV files - Ability to upload notes to Dropbox - Ability to add custom films with manually entered reciprocity times or as Gainer Method calculations - Ability to mark films as favourites so they appear at the top of the film list - Voice Recorder in the Note Keeper - Voice activated start of the timer
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2.01
Bug fixes. Fix for Velvia 100/100F times.
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2.02
Fix for bug in filter system
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2.03
Fix for bug in Custom Film Editor
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2.04
Bug fixes.
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2.54
This is a maintenance release to support iPhone 7 and 8. Bug and crash fixes. Added iOS 11 Support. Changed timer so exposures under 2 seconds can now be recorded. Fixed export to Dropbox. Changed night-mode to red.
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3.1
It's been a longtime coming! Version 3 of the original, and the best, Reciprocity Timer app for film photographers includes: - a completely re-vamped user interface - a completely re-designed Note Taker that's easier to use - you can now drag and drop notes between categories - support for sharing so you can Export, Save, Airdrop, Text, Email or Post Reciprocity Timer Custom Films, Notes and Camera Data. Export your stuff to iCloud, Dropbox wherever your phone has access to via the "Files" app. Import your data back into RT later. - re-developed notification system to ensure you get notified when your long exposures are ending - Redesigned Custom Film editor - can now calculate a reciprocity curve from as few as 5 or 6 data points. If you can get at least *some* information chances are RT can work with it to let you use that film. - added new films including support for Rollei, Berrger, some IR films, CineStill 50D and others. - added Film Holder support so you can use the note system to record even more details about your shots. RT will keep track of what holder you are using and the status of each frame. It'll warn you if you select the wrong film or if you try to shoot an unloaded or previously exposed holder. - Updated Zone Editor. You can now export your Zone-Marked up note images as Jpegs (with Note Exif Data attached) to your photos or the cloud. - many many bug fixes and improvements
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3.11
It's been a longtime coming! Version 3 of the original, and the best, Reciprocity Timer app for film photographers includes: - a completely re-vamped user interface - a completely re-designed Note Taker that's easier to use - you can now drag and drop notes between categories - support for sharing so you can Export, Save, Airdrop, Text, Email or Post Reciprocity Timer Custom Films, Notes and Camera Data. Export your stuff to iCloud, Dropbox wherever your phone has access to via the "Files" app. Import your data back into RT later. - re-developed notification system to ensure you get notified when your long exposures are ending - Redesigned Custom Film editor - can now calculate a reciprocity curve from as few as 5 or 6 data points. If you can get at least *some* information chances are RT can work with it to let you use that film. - added new films including support for Rollei, Berrger, some IR films, CineStill 50D and others. - added Film Holder support so you can use the note system to record even more details about your shots. RT will keep track of what holder you are using and the status of each frame. It'll warn you if you select the wrong film or if you try to shoot an unloaded or previously exposed holder. - Updated Zone Editor. You can now export your Zone-Marked up note images as Jpegs (with Note Exif Data attached) to your photos or the cloud. - many many bug fixes and improvements
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3.12
Loads of bug fixes and stability fixes. Added ability to turn Film Holder numbers on and off.
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3.51
Bug fixes. Lots. So many. Ability to back-up and restore the entire database including all cameras, holders and notes. From the "Settings" window you can export and restore the entire database. Also added some new films - Fomapan 400 and Ektachrome 100. Watch App! Start and check your exposure from your watch. Re-built Note-Taker for better reliability. Added the ability to swipe through notes. To install the Reciprocity Timer Watch App please make sure your watch is paired and available. The app is installed from the Apple Watch App on your iPhone. Use these steps: 1. Ensure your watch is paired and unlocked 2. Open the Watch App on your iPhone 3. Scroll down past "Installed Apps" to "Available Apps" 4. Locate Reciprocity Timer in alphabetical list of available apps 5. Press "Install" to add the App to your Watch 6. Once Installed the Watch App will appear on the Home Screen of your watch. To use the Watch App you need both it and the iPhone app running.
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3.55
Bug fixes only.
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3.61
Updated HP5+ times as per new Ilford spec. New feature - can add and edit Shutter Speeds for Lenses. This is useful if you have a lens that has non-standard times. There is a new "edit Shutter Speeds" button in the Lens Editor. Increased maximum focal length and bellows extension. Fixed bug in Custom Film Editor and in saving holders. Other bug fixes.
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3.7
Bug fixes. Problem with saving camera database fixed (at last!).
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3.8
More bug fixes.
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3.9
Bug fixes. Expanded and overlapped Bellows Range Sliders to allow for very long Bellows.
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3.95
Bug fixes - maintenance release.
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3.99
· 11 Oct 2024
Fixes to Note Taker drag and drop and saving. Fixes to PDF Export. Bug fixes.
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Availability by market
- US
Data quality & evidence
- Page completeness
- Live store listing
- Last verified
- 6 Aug 2026
- Sources
- App Store
- Independent summary has not been published yet.