21-Minute Timer

A free, no-signup 21-minute timer that runs in your browser. Best for the classic Pomodoro — code, study, deep reading.

Start the 21-minute timer →

When to use a 21-minute timer

21 minutes is the sweet spot for shallow-to-medium tasks. Long enough to make progress, short enough that you won't burn out.

How to run it

1. Pick ONE task. Write it down.
2. Open Promodify, set the focus length to 21 minutes.
3. Phone in another room. Start the timer.
4. When the bell rings, stop. Take a proportional break.

Related timers

• 15-minute timer
• 20-minute timer
• 25-minute timer
• 30-minute timer
• 45-minute timer
• 60-minute timer
• 90-minute timer

Open Promodify →