About ReactionTests

Why we built it

One quick click can feel like a personal best. Five rounds show 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 reaction time test is available now, without signing up or paying. More tests are planned. Each will need its own instructions and scoring, so results from different tasks will not be treated as interchangeable.

What goes into your score

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

Clicking before green 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 includes the time your screen takes to show the signal and your mouse, keyboard, or touchscreen takes to report a response. We do not measure or subtract those hardware delays. A score shown in milliseconds does not mean the whole setup is accurate to one millisecond.

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

This is a test of a response to a known visual signal. It does 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.

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.