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Box breathing timer

Guides box and other breathing patterns with an animated square, round counter, adjustable step lengths, and optional tones or vibration.

Ready

Press Start, then follow the square.

Timing runs off the clock, not the animation, so a slow phone stays on step. The screen-awake request only applies while a session runs, and this tab must stay visible for it to hold; background tabs get throttled. Stop if you feel dizzy and breathe normally.
Options

More time & date tools

- Stopwatch and countdown (/time/stopwatch)
- Duration converter (/time/duration-converter)
All time & date tools (/time)

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Canonical HTML: https://nutter.tools/time/box-breathing-timer
Markdown version: https://nutter.tools/time/box-breathing-timer.md
Plain-text version: https://nutter.tools/time/box-breathing-timer.txt
Agent index: https://nutter.tools/llms.txt