PerfectFast vs Guided Fasting

PerfectFast helps you track intermittent and extended fasts with a calm, focused experience. Set up a fasting plan, follow your active fast, review your history, and see progress statistics without clutter. The app supports common fasting schedules, custom durations, reminders, fasting stages, history views, statistics, appearance settings, local data export, and Live Activity support on compatible devices. Log water, weight, blood glucose, and ketones beside your fasts, and read them on the fast's own clock in the Fast Timeline, with resting heart rate, heart rate variability, body composition, and sleep from Apple Health if you connect it. The Apple Watch companion lets you check your current or scheduled fast from your wrist, start or end a fast when your iPhone is nearby, and keep progress on your watch face with complications. Your fasting data stays on your device unless you choose to export or share it.

Guided Fasting is the simplest way to track your intermittent fast, day by day. START WITH ONE TAP Choose your plan — 16:8, 18:6, 20:4, OMAD, or a custom window — and tap "Start fast". A progress ring shows how long you've gone and how much is left, in real time. YOUR METABOLIC PHASES Track which phase your body is in while you fast: glucose, glycogen, ketosis, and autophagy, with an explanation of what's happening in each one. STREAK AND HISTORY Every completed fast adds to your streak. History keeps every log with a weekly recap — average, record, and a chart across the last 7 days, 30 days, or your entire history. ALSO ON APPLE WATCH Start or break your fast from your wrist, synced instantly with your iPhone. REMINDERS Get notified when your fast ends and when it's time to start the next one, so you never miss it. EXTRA FEATURES Use advanced plans (20:4, OMAD, and custom) whenever you like, add a home screen widget with your live progress, save your streak if you break a fast early, and read the detail behind each metabolic phase — by watching a short ad, always optional and never required to use the app. YOUR DATA STAYS ON YOUR DEVICE Your entire history is stored locally on your iPhone. No account required. AVAILABLE IN ENGLISH AND SPANISH The app automatically detects your device's language, and you can change it manually anytime from Settings. No scales, no diets to follow, no clutter. Just you and your eating window.