Derin — Deep Work Timer

Derin is a focus timer built for people who do real work — developers, writers, freelancers, and anyone who needs uninterrupted time to think. Pick a session, start focusing, and see your progress live — right on your Lock Screen and Dynamic Island. No need to unlock your phone or check a tab. Just glance and keep going.

• Live Dynamic Island & Lock Screen countdown
• Calm, distraction-free design
• Fixed focus lengths