Ready when you are.
No fast running. Start one in a single tap — no account, no setup.
Fasting
0:00
elapsed
🧂 Extended fast guide
Milestones
This fast, hour by hour
Tap any hour for what's typically happening. Drag to scrub.
Calculators
Instant answers, no signup. Every result can become your schedule in one tap.
Your rhythm
No fasts yet — your rhythm starts here.
Every streak, insight, and record on this page grows from your first fast.
Rhythm score–
Windows kept (7d)–
Routine streak–
Grace shields–
Lifetime fasted–
🥊 Personal records
Longest hold–
Hold streak–
Private — only you see this board.
Calendar
Month
Day
Your plan
🔥 Fitness Mode
The challenge layer: workout logging, fasted-workout bonuses, and duration milestones — on top of the same free app.
🎯 7-day hold challenge
Protocol
Eating window–
Fasting–
Week
Weekdays and weekends can differ. Tap a day to set its window.
Pulse & progress
Balance0
LevelTick
This week's quests–
Settings
Theme
Big type
Reminders
Test notification
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Science notes describe typical ranges and were reviewed Mar 2026 — not medical advice.