Box breathing timer. Four seconds a side, in your browser, free.

hold hold breathe in breathe out

Ready?

 

 

Start breathing − 4s per side +

Breathe in as the dot climbs, hold across the top, breathe out on the way down, hold along the bottom. Four rounds take about a minute.

Runs in your browser. Nothing is tracked, nothing is sent anywhere.

The iPhone app adds haptics, streaks, and Siri.

Free. Requires iOS 26.

Press start and follow the dot: breathe in up the left side, hold across the top, breathe out down the right, hold along the bottom. Four rounds is about a minute. Change the seconds per side with the plus and minus; 4 is the classic box, 3 is gentler, 5 or 6 for a longer, slower breath. More about the app and why it is built for ADHD, or read where the technique comes from.