ShutterFinder — Flicker Detect
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| Rating | Price | |||
|---|---|---|---|---|
| Netherlands | 50%1 | 5.00 | €2.99 $3.46 | |
| United States | 50%1 | 5.00 | $2.99 | |
| United Arab Emirates | <1%0 | — | AED 12.99 $3.54 | |
| Afghanistan | <1%0 | — | $2.99 | |
| Antigua And Barbuda | <1%0 | — | $2.99 | |
| Anguilla | <1%0 | — | $2.99 | |
| Albania | <1%0 | — | $3.99 | |
| Armenia | <1%0 | — | $3.99 | |
| Angola | <1%0 | — | $2.99 | |
| Argentina | <1%0 | — | $2.99 |
Description
Stop guessing your shutter speed on set. ShutterFinder detects light flicker instantly and tells you the exact shutter speed to eliminate it.
HOW IT WORKS
Point your iPhone at any flickering light source — LED panels, fluorescent tubes, HMI lights, monitors, practicals — and tap MEASURE. ShutterFinder uses your iPhone's 240fps high-speed camera and real-time FFT analysis to detect the precise flicker frequency. Within seconds, you get the optimal shutter speed to shoot flicker-free.
BUILT FOR FILM PROFESSIONALS
Detects flicker frequency with precision using FFT spectral analysis
Recommends the exact shutter speed in time (1/50) or shutter angle (180°) — switch with one tap
Supports all common shooting frame rates: 23.98, 24, 25, 29.97, 30, 50, 60 fps — plus custom input
Change shooting frame rate after measurement and see shutter recommendation update instantly
Works with any flickering source: LED, fluorescent, HMI, neon, monitors, practicals
Identifies the source type (50Hz mains, 60Hz mains, PWM LED, etc.)
ONE-TAP WORKFLOW
No complicated menus or settings. Point at the source, tap MEASURE, get your shutter speed. That's it. The app automatically stops measuring when it has a confident reading.
TECHNICAL DETAILS
Uses 240fps slow-motion capture for high-resolution temporal sampling
FFT (Fast Fourier Transform) analysis via Apple's Accelerate framework
Sub-Hz frequency accuracy with parabolic interpolation
Automatic exposure adjustment for difficult lighting conditions
Detection range: 40–500 Hz
Requires iPhone XS or later with iOS 17.0+.