See what fasting is actually doing for you. Steadier heart rate, longer sleep, streaks you can watch grow. FivePhase finds the proof in your own data, entirely on-device.
Free timer · $9.99 unlocks everything, once · No account
Phased coaching
Pick a goal and your experience level. FivePhase walks you through five structured phases. Holding steady while you build the habit, then stepping the protocol up once you've earned it.
Lose weight
12:12 → 20:4 across levelsFrom cutting late-night snacks to deep fat-burning windows, one earned step at a time.
Mental clarity
12:12 → 18:6 across levelsStable morning energy first, then longer windows for steady, crash-free focus.
Gut health & autophagy
14:10 → 20:4 across levelsOvernight digestive rest, building toward real cellular-repair territory.
Why "FivePhase"
Fasting isn't one long wait. Your body moves through five metabolic phases. FivePhase puts them on the timer, so you always know what's happening inside and what's coming next.
Your last meal is still being processed.
Blood sugar settles; your body switches fuel sources.
Stored fat becomes the main energy source.
Ketones fuel your body and brain.
Cellular cleanup and repair kicks in.
On the timer, live. The ring marks each boundary, tells you the moment you cross it, and sends a nudge when you enter fat burning.
Predictive insights
FivePhase studies your own fasting history — no AI, no cloud, just your patterns. Then turns it into insights that keep you consistent:
Curious how it works? The app ships with a demo mode. Explore two months of sample data, insights and all, before your first fast.
Most fasting apps charge $50–$70 every single year. FivePhase never bills you again.
FivePhase