Both focus timers and Pomodoro use time boxes to create urgency and endpoints. ADHD benefits from that structure because “work until done” is a trap door into hours of drift.
Classic Pomodoro: 25 on, 5 off
Pros: predictable rhythm, easy to explain, built-in breaks. Cons: wrong length on low-energy or hyperfocus days; breaks can derail if transitions are hard.
If you fight the 25-minute block, the technique is not failing. You may need a different length.
Flexible focus timers
Choose 12-20 minutes when starting is hard; 30-45 when you are in flow. The principle is the same: one task, one window, one break.
CleanMyMind links the timer to Live tasks so you do not finish a block and wonder what was next.
Which should you use?
Use Pomodoro when 25 minutes feels natural most days. Use a flexible focus timer when your energy swings widely, or when breaks need to be longer after deep work.
Measure success by started sessions, not perfect adherence.