# FLICKERfree Calculator > Cinematography tool for calculating camera speed and shutter angle for flicker-free recording. (iPhone/iPad app by Thomas Barton.) - Source: https://appshunter.io/ios/app/flickerfree-calculator/id447247056 (this page in markdown: same URL + `.md`) - Developer: [Thomas Barton](https://appshunter.io/developer/447247059) - Category: Photo & Video, Reference - Price: Free - Rating: 4.70/5 from 6 App Store ratings · 7 written reviews indexed - Age rating: 4+ - Requires: iOS 11.0 · 2 MB - Languages: American English - Released: 2011-07-13 - Data updated: 2026-07-06 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/flickerfree-calculator/id447247056/reviews.md ## What is FLICKERfree Calculator? The Cinematography Electronics FLICKERfree Calculator is a handy tool to calculate the proper camera speed and shutter angle combinations for FLICKERfree film or digital cinematography. It is especially useful when using HMI or fluorescent lighting. Our FLICKERfree Calculator is designed with the same simplicity as our popular HMI Flickerfree Filming Speeds reference cards. Our App calculates the camera speed in Frames Per Second (fps) and camera Shutter Angle in Degrees. The colors on the calculator, Burgundy (50 Hz) or Blue (60 Hz), also match the colors on our reference cards. Features: * Easy to use with an attractive interface. * Selectable Line Frequency, either 50 Hz or 60 Hz. * Calculates the camera speed in Frames Per Second (fps). * Calculates the camera Shutter Angle in Degrees. * Calculates instantly when an entry is changed. * A finger slider allows user to select the Frames Per Second or Shutter Angle values. * Images of our HMI Flickerfree Filming Speeds reference cards are included. * Optimized for the iPhone 4 Retina screen. HMI Flickerfree Filming Speeds reference cards © 1986 - 2013 Cinematography Electronics Inc. ## Key features - Calculate camera speed (fps) - Calculate shutter angle (degrees) - Selectable line frequency (50/60 Hz) - Instant calculations - Finger slider for value selection - Includes reference card images ## Recent user reviews (7 of 7) All indexed reviews: https://appshunter.io/ios/app/flickerfree-calculator/id447247056/reviews.md ### 4/5 — Needs decimal places for framerates *2024-12-25* This app is brilliant and I use it all the time but I’m only giving it 4/5 stars because you can’t input decimals such as 23.98 or 29.97 or 59.94. You have to round off to the nearest whole number which is really annoying when I’m trying to be precise. Please add this feature, I’m sure it wouldn’t be that hard to implement. ### 3/5 — Not specific enough frame rate options *2018-11-21* I wish I could type in the specific frame rate up to three decimal points so that when shooting at 23.976 I can know for sure what angle should work. ### 5/5 — Awesome app *2012-05-01* Has saved my butt on many occasions! ### 5/5 — Excellent app - very useful tool to have. Compliments the pCam app wonderfully *2011-11-18* Excellent app ### 5/5 — Great app! *2011-07-13* I'm glad to see this in an app! I used to wait till the trade show to get their cards. Now, no more! ### 5/5 — Awesome! *2011-07-13* This app is quite nifty. Very accurate. My photos have all turned out great after using this apps calculations! ### 5/5 — Best App around!! *2011-07-13* By far the best App for job! Perhaps the best App in the world... ## Frequently asked questions about FLICKERfree Calculator ### What is FLICKERfree Calculator used for? FLICKERfree Calculator is used to determine the correct camera speed in Frames Per Second (fps) and camera Shutter Angle in Degrees for flicker-free film or digital cinematography, especially with HMI or fluorescent lighting. ### What line frequencies does FLICKERfree Calculator support? FLICKERfree Calculator supports both 50 Hz and 60 Hz line frequencies, indicated by distinct Burgundy (50 Hz) and Blue (60 Hz) color schemes that match physical reference cards. ### How quickly does FLICKERfree Calculator provide results? The app calculates instantly whenever an entry is changed, allowing for immediate adjustments to camera speed or shutter angle. ### What devices is FLICKERfree Calculator available on? FLICKERfree Calculator is optimized for iPhone and iPad devices, supporting the iPhone 4 Retina screen specifically. ### Is FLICKERfree Calculator free to use? Yes, FLICKERfree Calculator is available for free and does not feature in-app purchases or advertisements. ### How often is FLICKERfree Calculator updated? The app was last updated on February 19, 2018, to version 2.0.0. While not frequently updated, it remains a stable tool for its intended purpose. ### What is the age rating for FLICKERfree Calculator? FLICKERfree Calculator has an age rating of 4+, making it suitable for a wide range of users. ### Does FLICKERfree Calculator offer offline functionality? The app's description does not specify internet requirements, but its core functionality of calculation suggests it can be used offline. ## Version history (last 5 releases) ### 2.0.0 — 2018-02-19 This app has been updated by Apple to display the Apple Watch app icon. Updated for iOS 11.0 ### 1.45 — 2013-01-07 iOS 6 Support iPhone 5 Retina Screen Support ### 1.42 — 2012-06-01 -iPad Compatibility (Retina) -Zoomable FLICKERfree Cards ### 1.32 — 2011-10-08 Updated to work with iOS 5 ### 1.31 — 2011-09-13 -First Time User Optimization ## Apps similar to FLICKERfree Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [f8 Lens Toolkit](https://appshunter.io/ios/app/f8-lens-toolkit/id887877435) | 5.0 (8) | $9.99 | Photo & Video | | [ARRI ECS](https://appshunter.io/ios/app/arri-ecs/id1555674483) | — | Free | Photo & Video | | [CameraKit: Camera Tools](https://appshunter.io/ios/app/camerakit-camera-tools/id890528993) | 4.7 (318) | Free | Photo & Video | | [LensKit: Lens Tools](https://appshunter.io/ios/app/lenskit-lens-tools/id1523521746) | 4.9 (54) | Free | Photo & Video | | [CineLenses](https://appshunter.io/ios/app/cinelenses/id1237505707) | 2.6 (22) | Free | Photo & Video | | [pCAM Pro - Camera Tools](https://appshunter.io/ios/app/pcam-pro-camera-tools/id1308057201) | 4.9 (219) | $34.99 | Photo & Video | ## More apps by Thomas Barton - [CineTape AIR](https://appshunter.io/ios/app/cinetape-air/id688092462) All apps by Thomas Barton: https://appshunter.io/developer/447247059 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-06.*