InnerFast - Fasting Companion
Track Your Fasting Journey
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Transform Your Fasting Journey
InnerFast is your elegant companion for intermittent fasting and extended fasts. With beautiful visual progress tracking and intelligent stage monitoring, reaching your fasting goals has never been more intuitive.
Visual Progress Tracking
Watch your fast unfold with stunning activity rings that show your progression through each fasting stage. From the initial anabolic phase to deep ketosis, see exactly where you are in your journey at a glance.
Smart Goal Setting
Set personalized fasting goals from 16 hours to multiple days, or track without limits. Choose preset durations or pick a custom end time that fits your schedule. The app automatically adjusts your progress visualization based on your goals.
Five Fasting Stages
- Anabolic (0-4h): Post-meal nutrient processing
- Catabolic (4-16h): Glycogen depletion begins
- Fat Burning (16-24h): Ketone production starts
- Ketosis (24-72h): Deep fat adaptation
- Deep Ketosis (72h+): Maximum metabolic benefits
Comprehensive History
Every fast is saved with detailed information including duration, stages reached, and timestamps. Review your progress, identify patterns, and celebrate your achievements.
Flexible Notifications
- Stage change alerts at key milestones
- Motivational messages to keep you inspired
- Choose from 8 different motivational styles
- Customize frequency to match your needs
Beautiful Design
Crafted with care, InnerFast features a premium interface with smooth animations and an elegant color palette. Dark mode optimized for comfortable viewing any time of day.
Key Features
- Interactive activity rings for each fasting stage
- Toggle between time elapsed and time remaining
- Real-time percentage tracking
- Detailed stage information and descriptions
- Complete fasting history
- Edit start times if needed
- Statistics and progress insights
- No subscription required
Privacy Focused
Your fasting data stays on your device. No account required, no data collection, complete privacy.
Whether you're practicing 16:8 intermittent fasting, doing OMAD (One Meal A Day), or exploring extended fasts for deeper health benefits, InnerFast provides the clarity and motivation you need to succeed.
Download InnerFast today and make every fast count.
Bug fixes
The developer, S Boersma, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- S Boersma
- Size
- 4.7 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Sander Boersma