1
Allow camera access
The app needs camera permission to capture high-speed frames for flicker analysis. Grant access when prompted, or enable it later in iOS Settings → Flicker Meter → Camera.
By HighApps · iPhone
Measure LED and PWM light flicker with your iPhone camera.
Flicker Meter uses your iPhone's camera at up to 240 fps to detect light flicker. See peak frequency in Hz and flicker intensity as a percentage. Lock AE and white-balance for stable readings. An educational reference estimate — not a laboratory or medical instrument.
App Store soon
See how a measurement works
240 fps camera capture
Free · Remove Ads IAP
Peak Hz & intensity %
Hold-still guidance
iOS-first
How it works
Four steps. One flicker reading.
Flicker Meter analyzes rapid brightness changes from your iPhone's camera. High-speed capture at up to 240 fps on capable devices detects flicker up to approximately 120 Hz (Nyquist limit). Hold the phone still and point at the light or an evenly lit surface under it.
2
Point at the light
Aim the camera at the LED, fluorescent tube, monitor, or an evenly lit wall under the light. The app shows a live preview and frame rate indicator.
3
Hold still & start
Tap Start Analysis and hold the phone steady. The app captures frames and analyzes brightness over time. Hold-still guidance helps you maintain a stable reading.
4
Read the results
See peak flicker frequency in Hz, flicker intensity percentage, and a confidence rating. Lock AE and white-balance for more consistent measurements.
What's in the app
Built for education and reference, not certification.
Flicker Meter is a tool for understanding light flicker in everyday environments. It is not a laboratory instrument, not a medical device, and not for compliance testing.
Peak flicker frequency
Displays the dominant flicker frequency in Hz detected from the camera's brightness time-series. 240 fps capture on capable iPhones enables detection up to approximately 120 Hz (Nyquist limit).
Flicker intensity %
Shows how much the brightness varies as a percentage. Higher intensity means more pronounced flicker. Useful for comparing different light sources.
Confidence rating
Each reading includes a confidence level (High, Medium, Low) based on signal clarity, frame rate consistency, and hold-still stability. Low confidence suggests trying again with better lighting or a steadier hold.
Hold-still guidance
Real-time feedback helps you keep the phone steady during capture. Motion reduces measurement accuracy; the app alerts you if movement is detected.
AE & white-balance lock
Lock auto-exposure and white-balance to prevent the camera from adjusting mid-capture. Locked settings produce more stable brightness readings and cleaner frequency analysis.
Common light sources
Designed to measure home and office LEDs, fluorescent tubes, dimmable bulbs, and monitors or screens that may use PWM dimming. Not intended for strobes, lasers, or extremely high-frequency industrial lighting.
Free with Remove Ads
Download and measure for free. See ads on result and history screens. Optional Remove Ads in-app purchase unlocks an ad-free experience while keeping all measurement features available.
Educational estimate
Results are for education and reference only. Camera hardware, ambient lighting, distance, angle, and hold steadiness all affect accuracy. Not for legal, medical, regulatory, or professional certification use.
No account required
Open the app and start measuring. No sign-in, no name, no email. Measurement history stays on your device and is never uploaded to HighApps servers.
Be clear about limits
An estimate. Not a laboratory or medical instrument.
iPhone cameras vary by model and generation. Frame rates, exposure control, and sensor characteristics differ. Environmental factors — ambient light, distance, angle, surface reflectance, hand steadiness — all influence the reading.
Do not use Flicker Meter for legal compliance, regulatory certification, IEEE or IEC standards verification, workplace safety assessments, medical diagnosis, or professional lighting-quality reports. It does not claim to meet any laboratory or medical device standards.
No medical claims. Flicker Meter does not diagnose, treat, prevent, or cure any medical condition. It is not intended to assess migraine triggers, epilepsy risks, or any health-related light exposure. For health concerns related to light, consult a qualified healthcare professional.
For critical assessments — workplace lighting compliance, professional quality control, photometric certification — use calibrated, professional-grade equipment.
- iPhone camera only Requires a physical iPhone with camera access. Frame rates and flicker detection capability vary by device model. Older iPhones may not support 240 fps capture.
- Up to ~120 Hz detection At 240 fps, the Nyquist limit is approximately 120 Hz. Flicker above that frequency may alias or not be detected at all. The app reports what it can measure, not necessarily what is present.
- Environmental sensitivity Ambient light, distance to the source, angle, and how still you hold the phone all affect the result. The same light measured twice can yield different readings if conditions change.
- Educational & reference use Use the app to learn about flicker, compare light sources in your home or office, or satisfy curiosity. Do not rely on it for decisions that require certified accuracy.
Ready to check your lights?
Free on iPhone with optional Remove Ads purchase. Measure LED and PWM flicker in Hz and %. Camera required. Educational reference estimate.
App Store soon
Privacy & studio
Your measurements stay with you.
Privacy policy
Camera frames are analyzed for brightness and flicker, then discarded. Nothing is saved to your photo library or uploaded to HighApps servers. Ads via AdMob; Remove Ads IAP available. No account required.
Read the privacy policyMade by HighApps
Flicker Meter is published by HighApps. See the rest of the catalog, including Tint Meter, Light Meter Pro, and other tools and games, on the studio site.
Visit HighAppsGet the app
Start measuring light flicker today
Free on iPhone with optional Remove Ads in-app purchase. Camera required. Educational reference estimate — not a laboratory or medical instrument.
App Store soon