FlickerCheck: PWM Meter
Screen & LED Flicker Test
About
This utility uses your iPhone camera to detect and analyze screen and light flicker. It provides easy-to-understand results, including estimated frequency and modulation depth, with privacy-focused on-device processing.
What's New in FlickerCheck
1.0
September 1, 2026
Subscriptions & In-App Purchases
$4.99
Lifetime Pro
Unlock unlimited Screen and Light flicker tests
Developer apps
FAQ
What is FlickerCheck?
FlickerCheck is a utility app that uses your iPhone's camera to screen and analyze screen and light flicker. It provides an estimated dominant flicker frequency and modulation depth, along with a flicker level and measurement confidence.
How does FlickerCheck work?
The app samples brightness from your camera's image over time, checks signal quality, and looks for repeatable brightness variations. All camera analysis is processed locally on your device for privacy.
What are the limitations of FlickerCheck?
FlickerCheck is a screening utility, not laboratory equipment. Factors like camera frame rate, exposure, movement, and frequencies above the camera's sampling range can affect results. It does not diagnose eye strain or health conditions.
Is FlickerCheck free to use?
FlickerCheck offers two free measurements. A one-time purchase unlocks unlimited access to Screen and Light tests. Failed or indeterminate measurements do not count towards the free allowance.
Does FlickerCheck have ads?
No, FlickerCheck does not contain advertisements. The app is ad-free.
What devices does FlickerCheck support?
FlickerCheck is currently supported on iPhone devices. It was last updated on September 1, 2026, with version 1.0.
What is the age rating for FlickerCheck?
FlickerCheck has an age rating of 9+, making it suitable for a wide range of users interested in display and light analysis.
Can FlickerCheck measure very high frequencies?
High-frequency PWM may not be recoverable as its true physical frequency due to limitations in camera sampling rates. The app will indicate if a reliable measurement cannot be determined.
