Reaction Time Test

Understanding the result

What a result means

Use repeated observations and compare the live indicators. A normal result means the browser received the expected events or values during this session.

A successful indicator means the expected event or stream reached this page. A missing or unusual value is a reason to repeat the action and compare conditions; it is not, by itself, proof that a component needs repair.

How to use this test

1. Press Start and wait without holding the button.
2. Click or tap only after the panel says GO.
3. Repeat several trials under the same conditions.
4. Compare the average rather than one unusually fast value.

What this test checks

• Randomized wait before the signal
• Latest, best and average response
• False-start detection
• Mouse and touch input

What this test cannot check

Results reflect events and values exposed by this browser.

This test does not certify hardware or replace professional inspection.

Browser scheduling, display latency and input hardware affect the result.

This is recreational and not a medical or neurological assessment.

Common problems and troubleshooting

Reload the page, confirm the test area has focus, check browser permissions and connection, then compare a current second browser. If the same fault remains across devices, contact the manufacturer or a qualified technician.

1. Confirm focus and support. Click inside the marked test area and review the compatibility status above.
2. Check the connection. Reconnect a cable, receiver, Bluetooth device or media device where relevant.
3. Review permission and settings. Check the browser site controls and operating-system privacy, input, output or scaling settings.
4. Remove competing conditions. Close another app using the device, keep timing pages visible and reduce heavy system load.
5. Compare safely. Repeat the same action in a second current browser or another port/computer when practical.

If a consistent problem remains across applications and connections, contact the manufacturer or a qualified technician with the repeatable observations.

Browser compatibility

Uses feature detection. Chrome, Edge, Firefox and Safari can expose different capabilities and permission behavior.

HTTPS is required for camera, microphone and some output-selection features. Background tabs can throttle animation and input timing. Mobile system gestures may reserve some touch combinations.

This table is editorial context. The live feature check above is authoritative for this browser and device.

Privacy information

Test values are calculated in this browser. Device Test Bench does not store a test result or create a device fingerprint.

The public analytics allowlist does not accept pressed keys, typed text, pointer coordinates, media labels, device IDs, recordings, video frames or controller input. Test results are not written to LocalStorage.

Primary technical references

These specifications define the browser signals used by this test. They document web-platform behavior; they do not certify a particular device.

• Pointer Events specificationW3C
• UI Events specificationW3C

Frequently asked questions