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Related tools

• ⬛ Black screenA full-screen black panel — the one that shows dust, smears and reflections a bright picture hides. Also the quiet way to leave a screen on without lighting the room.
• 👏 BPM counterTap along and read the tempo. The number is the median gap between taps, not the average, so one late tap does not move it — plus a steadiness figure.
• 📐 Timer accuracyThree ways of building a countdown, measured in a frozen tab against the system clock. One of them loses 119 seconds out of 150; ours loses none.
• ♟ Chess clockA two-sided chess clock with increment, move counts and a flag. Tap your own side to end your move — increment is added on the press, which is how Fischer timing works.
• 🏫 Classroom timerA timer built to be read from the back of a room: full-screen digits, amber under a minute and red under ten seconds, so it works with the sound off.
• ⏳ 1 hour timerA 1 hour timer that rings from a background tab and keeps the screen awake. Press start — nothing to install, no account, and the countdown sits in the tab title.