Flicker Insight: PWM Test
LED, Screen & Light Meter
Only for iPhone
$0.99 · Designed for iPhone
iPhone
Use your phone’s rear camera to check in just 3 seconds whether a light source or screen is flickering.
Desk lamps, eye-care lamps, LED bulbs, computer monitors, and smartphone screens may appear steady, while actually producing brightness fluctuations—flicker—that are difficult to detect with the naked eye.
Prolonged exposure to flickering light may contribute to eye fatigue, eye strain, headaches, or even dizziness.
This app helps you detect flicker that may otherwise go unnoticed.
【QUICK FLICKER TEST】
Point your camera at a light source or screen. The app collects adaptive samples at multiple shutter speeds for about 3 seconds and continuously updates the screening result.
• Screening result: Flicker detected / No significant flicker detected / Unable to determine
• Eye comfort assessment: Low, medium, or high risk based on the measured flicker level
• Detailed metrics: Flicker index, modulation depth, dominant frequency, and brightness waveform
【MORE THAN FLICKER DETECTION】
• Ambient illuminance estimate: Provides an approximate brightness range to help you assess whether the environment is suitable for visual tasks.
• Color temperature estimate: Provides an approximate color temperature for reference.
【EXPORT AND SHARE】
Generate a PDF report containing the waveform, frequency spectrum, light source image, and test conclusion, or export the raw data as a CSV file.
【PRIVACY FIRST, FULLY OFFLINE】
• No ads, no analytics SDKs, and no account required.
• The app does not actively connect to the internet. All data remains on your device.
• Videos created during measurement are processed temporarily and deleted immediately after analysis. Only measurement results and notes are retained.
• You can clear all locally stored data at any time from Settings.
【AVAILABLE IN 12 LANGUAGES】
Simplified Chinese, Traditional Chinese, English, Japanese, Korean, French, German, Spanish, Portuguese, Russian, Arabic, and Hindi.
【IMPORTANT NOTICE】
This app provides consumer-grade screening of lighting conditions. Results may be affected by your phone camera’s frame rate, exposure, rolling shutter, and ambient light. It is not a substitute for professional photometric testing, standards compliance certification, or medical diagnosis.
Privacy Policy: https://wwmmkk.github.io/Flicker-Insight/Privacy%20Policy
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Improved stability when deleting history records.
If you have any suggestions for improving the app, feel free to contact me through the feedback option at the bottom of the Home screen!
The developer, 名楷 王, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 名楷 王
- Size
- 2.6 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 11 more
- English, Arabic, French, German, Hindi, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- Copyright © 2026 Mingkai Wang. All rights reserved.
