01
Keyboard Test
Test keyboard keys, inspect repeated inputs and review a local test summary. Get clear…
Ambient Light and Sensor Check
Reports which environmental sensors your device exposes to the browser, and explains why most of them are deliberately unavailable.
Device Tests
Nothing uploaded
No sign-up
Free, unlimited
The test starts automatically — follow the prompts above.
In short
Ambient Light and Sensor Check is a free online tool on inputtesthub.com that reports which environmental sensors your device exposes to the browser, and explains why most of them are deliberately unavailable. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Ambient Light and Sensor Check
- The test starts on its own — no button to press and nothing to install.
- Follow the prompt in the test panel and watch the readings update live.
- Press Reset to start over with a clean slate.
About the Ambient Light and Sensor Check
The Ambient Light and Sensor Check reports which environmental sensors your device exposes to the browser, and explains why most of them are deliberately unavailable. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Finding out which sensors a web page can and cannot reach on your device.
- Checking sensor support before building something that depends on it.
Where this tool stops
This reports capability, not readings. Light and proximity values are not available to web pages in current browsers.
Frequently asked questions
Why can I not read the light sensor directly?
Browsers removed the Ambient Light Sensor API from general web pages because readings could be used to infer what was on screen and to fingerprint devices. It now sits behind a permission and is unavailable in most browsers, which is a privacy decision rather than a hardware limitation.
What about the proximity sensor?
The same applies. Neither sensor is reachable from an ordinary web page in current browsers.
Do I need an account to use the Ambient Light and Sensor Check?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the page.
Is what I paste into the Ambient Light and Sensor Check stored?
No. The Ambient Light and Sensor Check runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What do people use the Ambient Light and Sensor Check for most?
In practice it gets used for three things: finding out which sensors a web page can and cannot reach on your device. Checking sensor support before building something that depends on it. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything the Ambient Light and Sensor Check cannot do?
This reports capability, not readings. Light and proximity values are not available to web pages in current browsers. Knowing where a tool stops being trustworthy matters more than the cases where it works.
Does the Ambient Light and Sensor Check need an app or a driver?
No installation, no extension and no driver. The Ambient Light and Sensor Check uses the browser's own device APIs and begins as soon as the page loads, so there is nothing to press first. Press Reset at any point to start over with a clean slate.
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