Fastinghour is your smart fasting companion built entirely on Apple Shortcuts. Set your window, track your fast, and let your body do the rest — no willpower diet required.
No crash diets. No calorie counting. Just proven biology working in your favor.
After 12–14 hours of fasting, your body depletes glycogen stores and switches to burning stored fat for fuel — a process called ketosis. This is when real, lasting fat loss happens.
Fasting keeps insulin levels low for extended periods, allowing fat cells to release energy freely. Stable insulin also reduces cravings and afternoon energy crashes.
Around the 16-hour mark, your body triggers autophagy — it clears out damaged cells and recycles cellular waste. This is why fasting is linked to longevity and clearer skin.
During the fasting state, your brain runs on ketones — a cleaner, more efficient fuel than glucose. Many users report remarkable mental clarity and focus during their fasting window.
You finish dinner. Your 8-hour eating window ends. Your body starts digesting and absorbing nutrients.
Blood sugar normalizes. Insulin drops to a low baseline. Fat storage mode begins switching off.
Glycogen is depleted. Your liver begins converting fat into ketones. Fat burning is now active.
Cellular repair is in full swing. You've hit the sweet spot. Now enjoy your 8-hour eating window guilt-free.
Fastinghour lives right in your Apple Shortcuts. Tap once — your whole fasting day is managed.
Start and stop your fast with a single tap. Fastinghour logs your start time, calculates your 16-hour target, and sends you a notification when you hit the goal.
Every fasting session is automatically recorded. View your streak, total fasting hours, and completion rate in a clean daily or weekly summary — all inside Shortcuts.
Get notified when your eating window opens, when you're halfway through your fast, and when you've reached the 16-hour milestone. Stay on track without obsessing.
Staying hydrated is key during a fast. Fastinghour reminds you to drink water at smart intervals throughout your fasting window — keeping hunger at bay naturally.
See how many days you've fasted this week, your longest streak, and your average fasting duration. Small wins build big momentum.
Know exactly how long your eating window lasts. Fastinghour shows a live countdown so you can plan meals without stress — no more guessing if it's "too late to eat."
No paid promotions. Just honest stories from people who made 16:8 a habit.
I've tried every diet — keto, calorie counting, meal prep. Nothing stuck. Fastinghour is the first thing that felt sustainable. I lost 14 lbs over 3 months without feeling deprived once.
As a software engineer I'm always at my desk. Fastinghour's reminders kept me accountable and the mental clarity during my fasting hours made me genuinely more productive at work.
Post-pregnancy weight loss felt impossible. My doctor mentioned intermittent fasting and I found Fastinghour. Super easy to use, fits around my schedule. Down 18 lbs in 4 months!
It takes 30 seconds to set up. No app store. No account. Just tap and go.
🔒 No account required · No personal data collected · Open source
Fastinghour started as a personal project. We were frustrated that every fasting app was bloated, full of subscriptions, and required yet another account. So we built something different.
Using Apple Shortcuts, we created a lightweight, privacy-first fasting companion that lives on your phone without being another app. No sign-up, no tracking, no upsells.
Our mission: make the world's most effective eating pattern accessible to everyone — for free, forever.