ShutterFinder — Flicker Detect
Shutter speed flicker detector
Price history
About
Instantly detect light flicker from various sources and get the precise shutter speed needed to eliminate it. Built for film professionals, this tool uses your iPhone's high-speed camera and advanced analysis for flicker-free shooting.
What's New in ShutterFinder
1.4
June 10, 2026
Bug fixes
Charts
Developer apps
FAQ
What is ShutterFinder?
ShutterFinder is a tool that detects light flicker from sources like LEDs and fluorescent lights. It then provides the exact shutter speed or angle needed to eliminate this flicker for smoother video footage.
How does ShutterFinder work?
It uses your iPhone's 240fps high-speed camera and real-time FFT analysis to measure the flicker frequency of light sources. The app then calculates and recommends the optimal shutter speed to avoid flicker.
What types of lights can ShutterFinder detect flicker from?
ShutterFinder can detect flicker from a wide range of sources including LED panels, fluorescent tubes, HMI lights, monitors, and other practical lights.
What devices does ShutterFinder support?
ShutterFinder requires an iPhone XS or later running iOS 17.0 or newer. It is designed for the iPhone platform.
How much does ShutterFinder cost?
ShutterFinder is available for a one-time purchase price of $2.99. There are no in-app purchases or subscription fees associated with the app.
Is ShutterFinder suitable for beginners?
While built for professionals, ShutterFinder features a one-tap workflow. Simply point at the light source, tap measure, and get your shutter speed, making it accessible.
How accurate is ShutterFinder's flicker detection?
The app achieves sub-Hz frequency accuracy with parabolic interpolation and uses 240fps slow-motion capture for high-resolution temporal sampling, ensuring precise readings.
Does ShutterFinder have ads?
No, ShutterFinder is ad-free. As a paid application, it provides an uninterrupted user experience without any advertisements.