How to Use the Reaction Time Test

2. How to use the Reaction Time Test

Here is the whole process, step by step.

1. 1Measure how quickly you react to a visual signal.
2. 2Play using the on-screen controls — your score is tracked as you go.

Your result updates as you type — there is nothing to press and nothing to wait for.

Everything runs in your browser — your files and text never leave your device.

3. Tips for best results

1. Your text never leaves your device — The tool runs entirely in your browser using JavaScript. Nothing is uploaded, so you can paste private documents without worry. That also means there is no account to create and no file to upload.
2. It works on your phone too — Open the tool in any modern browser on Android or iPhone. The layout adjusts to the screen and everything works the same way on a small screen as on a desktop.

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