# ShutterFinder — Flicker Detect — Shutter speed flicker detector

> Detects light flicker and recommends optimal shutter speed for flicker-free video. (iPhone/iPad app by Nuncha.)

- Source: https://appshunter.io/ios/app/shutterfinder-flicker-detect/id6760565737 (this page in markdown: same URL + `.md`)
- Developer: [Nuncha](https://appshunter.io/developer/371879216)
- Category: Photo & Video, Utilities
- Price: $2.99 (on sale, was $12.99)
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-03-20
- Data updated: 2026-09-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/shutterfinder-flicker-detect/id6760565737/reviews.md

## What is ShutterFinder?

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+.

## Key features

- Detects flicker frequency with precision
- Recommends exact shutter speed or angle
- Supports all common shooting frame rates
- Works with LED, fluorescent, HMI, and monitors
- Uses 240fps slow-motion capture
- FFT spectral analysis for accuracy


## Frequently asked questions about ShutterFinder

### 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.

## Version history (last 4 releases)

### 1.4 — 2026-06-10

Bug fixes

### 1.3 — 2026-06-01

UI updates

### 1.2 — 2026-03-20

Improved shutter detection.

### 1.1 — 2026-03-20

No release notes.

## More apps by Nuncha

- [Next Currency Converter Pro](https://appshunter.io/ios/app/next-currency-converter-pro/id487830868)
- [Next Currency Converter](https://appshunter.io/ios/app/next-currency-converter/id514532466)
- [Martini – Film Crew Hours](https://appshunter.io/ios/app/martini-film-crew-hours/id6778999985)

All apps by Nuncha: https://appshunter.io/developer/371879216

## Related topics

[flicker and flame](https://appshunter.io/ios/topics/flicker-and-flame)

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*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 2026-09-07.*