Your fasting app should know why you're fasting.
StayFasted coaches you through every hour with on-device AI that knows your mood, your body stage, and your reasons. No account. No cloud. Just you.
Join 247 fasters on the waitlist. Lifetime deal drops April 1st.
Every other fasting app does the same thing.
You deserve more than a countdown clock.
A coach that knows what
hour 36 feels like.
On-device AI that responds to your exact situation — your fasting stage, your mood, your reasons. Not canned quotes. Real coaching.
"I'm starving. All I can think about is food. I don't know if I can make it to 18 hours."
"I feel flat. Not hungry really, just... empty. Like what's the point of pushing further?"
"I'm standing in the kitchen. I just need one bite. One won't hurt."
Know exactly what's happening
inside you.
Your body goes through 8 distinct stages during a fast. StayFasted teaches you each one in real time — so you know exactly why you feel what you feel.
Fed State
Your body digests and absorbs nutrients. Blood sugar rises, insulin is active. Energy is readily available from your last meal.
Early Fasting
Insulin drops. Your body taps glycogen stores in the liver. Blood sugar stabilizes. First cravings appear — your brain asking for easy fuel.
Glycogen Depletion
Liver glycogen runs low. Your body begins mobilizing fat stores. Ghrelin waves peak and fall. This is where most people quit — but the magic is just starting.
Metabolic Switch
Glycogen depleted. Your body converts fat into ketones for fuel. Mental clarity increases. This is the breakthrough most people quit before reaching.
Deep Ketosis
Full fat-burning mode. Growth hormone increases up to 5x. Your body becomes incredibly efficient at using stored energy. Many report feeling euphoric.
Autophagy Begins
Cells begin recycling damaged components — literally cleaning house. This is the cellular repair process that researchers believe may slow aging.
Peak Autophagy
Maximum cellular cleanup. Old immune cells break down. BDNF (brain-derived neurotrophic factor) increases. Your body is rebuilding from the inside out.
Immune Reset & Stem Cells
Stem cell production increases. The immune system regenerates. Deep healing happens here. This is the frontier of fasting science.
Built for people who
actually fast.
Features you won't find in any other fasting app. Because we built the app we wished existed.
Schedule Next Fast & Rhythm Planner
Plan your fasting rhythm weeks ahead. Set repeating schedules — 16:8 Mon-Fri, 24h on Sundays, 48h once a month. Your calendar, your rhythm, your life.
28-Day Adherence Grid
See your fasting consistency at a glance. Green for completed, yellow for partial, empty for missed. Patterns emerge. Streaks motivate. Accountability becomes visual.
Refeed Guide
Breaking a fast matters as much as the fast itself. Get personalized refeed recommendations based on your fast duration — what to eat, what to avoid, and when.
Your data never leaves
your phone.
StayFasted runs entirely on your iPhone. Your health data, your fasting history, your AI conversations — nothing leaves your phone. Ever.
On-Device AI
Your coaching conversations never leave your iPhone. No cloud processing, no data collection, no compromises. The AI runs locally, period.
No Account Required
No email. No login. No sign-up wall. Download the app and start fasting. Your data is yours from the first second.
Apple Health Integration
Syncs with Apple Health for weight, heart rate, and activity data. Everything stays in Apple's encrypted ecosystem. No third-party servers.
Stop renting your
fasting app.
Other apps charge $80-180 every year. On April 1st, StayFasted launches with lifetime access for the first 50 people. One payment. Yours forever.
Your next fast doesn't
have to be alone.
Whether it's your first 16-hour fast or your tenth 72-hour fast — StayFasted is the partner that stays with you through every hard moment.
Stay with it.