Why FastZen
Free core, forever
All preset plans, the timer, history, streaks and notifications are free.
Flexible Pro
Custom goals and insights via monthly, yearly (7-day trial when eligible), or lifetime. Free forever stays complete. No ads.
Stage timeline
See the phases commonly associated with each hour of your fast.
Fully private
No account, no server — your fasting history stays on your device.
Privacy
Your fasting history never leaves your iPhone. Privacy Policy
FastZen is a timer and logging tool, not medical advice. Consult a healthcare professional before starting any fasting practice.