Light Detector
A free browser-based light detector that uses your device camera to measure ambient brightness and converts it into an audio tone. Designed for blind and visually impaired users to independently detect light levels in any room or environment.
Turn your camera into an accessible light sensor
100% in-browser. No video or images are sent to any server.
Features
How to Use
Press the Start Camera button to activate your device camera.
Point the camera at the area you want to check for light.
Listen to the tone: higher pitch and louder means more light.
Adjust sensitivity if the readings seem too high or too low.
Switch to Tap to Check mode if you prefer on-demand readings instead of continuous sound.
Frequently Asked Questions
How does the light detector work?
The tool uses your device camera to capture video frames, analyzes the average brightness of each frame, and maps that value to an audio tone. Brighter light produces a higher pitch and louder volume.
Is it accurate enough for daily use?
It provides a reliable relative measure of brightness. While not a calibrated lux meter, it clearly distinguishes dark, dim, moderate, bright, and very bright conditions — enough for tasks like finding windows, checking if lights are on, or locating light sources.
Does it work on mobile phones?
Yes, it works on any device with a camera and a modern browser. On mobile phones, it prefers the rear camera for better light measurement. Vibration feedback is also available on supported devices.
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