About ReactionTests

Why we built it

One quick click can feel like a personal best. A full session shows whether you can repeat it. We built ReactionTests around that difference: take the test, see every round, and compare complete sessions over time.

The visual test and sound reaction time test are available without signing up or paying. Each has its own instructions and result history, so scores from different tasks are kept separate.

What goes into your score

After a random wait of one to three seconds, the visual test turns green or the sound test plays its cue. The timer measures the time until your click, tap, or key press is registered. Finish five visual rounds or seven sound rounds to see your average: all valid response times added together, divided by the number of rounds.

Responding before the signal asks you to retry that round. Switching away from the page pauses an active round. Neither adds a score to your average.

The timer uses elapsed time, rather than counting animation frames. Both the 3D display and the simpler 2D version use the same timing and scoring rules.

How accurate is the test?

Your result depends on the display or audio output and how your mouse, keyboard, or touchscreen reports a response. The visual test does not subtract hardware delays; the sound test uses the browser’s estimated audio output timing. A score shown in milliseconds does not mean the whole setup is accurate to one millisecond.

Sound calibration applies a personal offset after you verify and confirm it. Your sound history keeps both the adjusted scores and original timings. This setting includes your tapping habits and device timing; it does not measure hardware delay in isolation.

For tracking progress, use the same device, input method and calibration setting. Compare several complete sessions. Changing from a phone to a computer can change your scores even if your reaction speed has not changed.

These tests measure a response to a known visual or sound signal. They do not assess medical reflexes, driving ability, or performance in a sport.

Where the reference data comes from

The homepage links to the published research behind its comparisons, including MindCrowd studies and the Woods study used for the age table. Dates, age groups, and test methods matter: a laboratory result and a browser result are not measured under identical conditions.

These references are not averages collected from ReactionTests visitors. We do not assign a population ranking to your score. You can read the studies alongside the average reaction time table.

Your results stay with you

Completed sessions are saved in the browser you use for the test. There is no account or cloud sync. Sharing a result downloads an image; you decide where to send it. The Privacy Policy explains local storage and other information handled when you visit the site.

Audio credits

Piano samples for the sound reaction time test come from Salamander Grand Piano by Alexander Holm, licensed under CC BY 3.0. Playback trims leading silence, transposes some notes, normalizes volume, and adjusts the attack and release envelope.

Contact the project

For questions about ReactionTests, a problem with the test, or a correction to the reference material, email support@reactiontests.org. If you spot a data error, include the passage and a link to the source so we can check it.