TapLab waits for a randomized visual signal and measures the time from that signal to your click in the browser.
Open interactive TapLab ↗Human reaction, mouse switch latency, USB polling, display refresh, browser scheduling and system load all contribute.
Run multiple attempts and focus on a repeatable range rather than one lucky outlier.
The interactive site can attach best results to a nickname. With the optional backend enabled, scores can appear in a shared Top 50.