Intermittent Fasting Timer App for iPhone
TrackFasts is an intermittent fasting timer app for iPhone that makes fasting simple — tap once to start any protocol (16:8, 18:6, 20:4, OMAD), get notified when you're done, and watch your streak grow. 100% private with no accounts, no cloud, and no tracking. Works offline, always.
Download on the App StoreFree · iPhone, iPad, Apple Watch · iOS 17+
Key Features of TrackFasts
TrackFasts supports 4+ intermittent fasting protocols, streak tracking, Apple Watch integration, and science-based fasting education — all processed on-device with zero data collection.
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4+ Fasting Protocols with One-Tap Start
Choose from 16:8, 18:6, 20:4, or OMAD (One Meal A Day) and start your fast with a single tap. Switch between protocols at any time to find what works best for your lifestyle and goals.
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Visual Progress Ring & Smart Notifications
A beautiful progress ring shows exactly where you are in your fast. Smart notifications alert you when your fasting window is complete — no need to keep checking the app.
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Streak Tracking & Milestone Predictions
Build consistency with streak tracking that keeps you motivated. Daily reminders prevent missed fasts, and milestone predictions show what's ahead based on your progress.
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Apple Watch Companion App
Start, stop, and monitor your fasting timer directly from your wrist. Home screen and lock screen widgets on iPhone give you at-a-glance progress without opening the app.
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Science-Based Fasting Education
Learn what happens at each stage of your fast: when fat burning begins, when autophagy starts, and the science behind each phase. Hydration reminders help you stay safe throughout your fast.
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Weight Tracking with Trend Charts (Pro)
Track your weight alongside your fasting progress. Visual trend charts show how intermittent fasting affects your weight over time, with complete fasting history and statistics.
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100% Private — No Accounts, No Cloud
All your fasting data stays on your device. No account creation, no cloud sync, no tracking. TrackFasts works completely offline so your health data is always under your control.
How to Start Intermittent Fasting with TrackFasts
Download Free
Get TrackFasts from the App Store. No account creation needed — open and go.
Pick a Protocol
Choose 16:8, 18:6, 20:4, or OMAD. Not sure? 16:8 is the most popular starting point.
Tap to Start
One tap begins your fast. The progress ring and notifications handle the rest.
Build Your Streak
Complete fasts, grow your streak, track your progress. Consistency is the key to results.
Who Uses TrackFasts?
Beginners Starting Intermittent Fasting
If you've never tried intermittent fasting before, TrackFasts makes it easy. Start with the popular 16:8 protocol, follow the progress ring, and let notifications tell you when to eat and when to fast.
Experienced Fasters Tracking Progress
Already fasting regularly? TrackFasts adds streak tracking, weight trend charts, and science-based insights on autophagy and ketosis stages so you can optimize your fasting routine.
Apple Watch Users
Control your fasting timer from your wrist. The Apple Watch companion app lets you start and monitor fasts without pulling out your phone — perfect for busy days.
Privacy-Conscious Users
TrackFasts processes everything on-device. No account required, no cloud uploads, no data tracking. Your health data stays on your iPhone — period.
TrackFasts Pricing
TrackFasts is free to download with core fasting timer features. Premium unlocks weight tracking, science-based insights, and complete fasting history.
Free
$0
- ✓ Fasting timer (all protocols)
- ✓ Streak tracking
- ✓ Notifications
- ✓ Apple Watch app
- ✓ Widgets
Annual
$19.99/year
- ✓ Everything in Free
- ✓ Weight tracking & trends
- ✓ Science-based insights
- ✓ Full fasting history
Lifetime
$29.99
- ✓ Everything in Premium
- ✓ One-time payment
- ✓ All future updates
Frequently Asked Questions
What is the best free intermittent fasting app for iPhone?
TrackFasts is a free intermittent fasting timer app for iPhone that supports 4+ fasting protocols (16:8, 18:6, 20:4, OMAD) with one-tap start, streak tracking, and Apple Watch support. It works 100% offline with no account required. Premium features like weight tracking and science-based insights are available via optional upgrade.
What fasting schedules does TrackFasts support?
TrackFasts supports 4+ intermittent fasting protocols: 16:8 (16 hours fasting, 8 hours eating), 18:6, 20:4, and OMAD (One Meal A Day). You can start any protocol with a single tap and switch between them at any time.
Does TrackFasts work with Apple Watch?
Yes. TrackFasts includes an Apple Watch companion app so you can start, stop, and monitor your fasting timer directly from your wrist. It also supports home screen and lock screen widgets on iPhone for at-a-glance progress.
Is TrackFasts private? Does it collect my data?
TrackFasts is 100% private. All data stays on your device — no accounts, no cloud sync, no tracking. It works completely offline. The only data collected (usage data) is not linked to your identity, as disclosed on the App Store.
How much does TrackFasts cost?
TrackFasts is free to download and use with core fasting timer features. Premium features (weight tracking, science-based insights, full history) are available for $2.99/month, $19.99/year, or a one-time $29.99 lifetime purchase.
What happens to my body during intermittent fasting?
During intermittent fasting, your body transitions through several stages: fat burning typically begins after 12 hours, autophagy (cellular cleanup) starts around 16–18 hours, and deeper ketosis occurs at 20+ hours. TrackFasts provides science-based education on each stage so you understand what's happening during your fast.
Can I track my weight with TrackFasts?
Yes. TrackFasts Pro includes weight tracking with visual trend charts so you can see how intermittent fasting affects your weight over time. Milestone predictions show what's ahead based on your progress.
Start Your First Fast in Under 10 Seconds
Free on iPhone, iPad, and Apple Watch. No account required.
Download TrackFasts — Free