SOL — Fasting Timer & Tracker
Know what's happening inside
Only for iPhone
Free
iPhone
SOL reveals what your body is doing at every stage of your fast - backed by real science.
SOL (솔) — Korean for Pine Tree. Like the pine that endures through every season, SOL stands with you through every fast.
WHAT MAKES SOL DIFFERENT
Most fasting apps just show a timer. SOL shows you what's actually happening inside your body — in real time.
As you fast, SOL guides you through each biological phase:
Fed State → Insulin Dropping → Fat Burning → Ketosis → Autophagy → Deep Autophagy → Growth Hormone Surge → Immune Reset
FEATURES
• Beautiful minimal timer with progress ring
• Real-time body phase updates with scientific sources
• Full body timeline — see all 8 phases and your progress
• Tap any phase for in-depth science and PubMed sources
• Smart notifications at each milestone
• Stats dashboard — track your fasting journey
• Background timer — keeps running when you close the app
• Light & dark mode with handcrafted watercolor textures
• Home screen widget
• Community pulse — you're not fasting alone
• Share your results with a beautiful card
FASTING GOALS
Choose from 16h, 18h, 20h, 24h, 36h, 48h, 72h, or go Open with no time limit. Hit your goal? Extend to the next level.
DESIGNED WITH INTENTION
SOL is inspired by the simplicity of nature. No clutter, no ads, no unnecessary features. Just you, your fast, and the knowledge of what your body is doing.
All body phase information is based on peer-reviewed scientific research with direct links to PubMed sources.
Begin your fast. Know your body. Grow like the pine.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
What's new in SOL 1.1:
- Gong sounds when you begin and complete a fast
- Started Earlier - dial in when you actually stopped eating
- Navigate home during a fast without losing your timer
- Check-in cards at 24h, 36h, and 48h milestones
- Beautiful watercolor card buttons
- Perks teaser - rewards coming soon
- Widget now clears properly when fast ends
- Share button now uses native iOS share sheet
The developer, Danny Linsner, 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
- Danny Linsner
- Size
- 6.1 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 16 or later.
- iPhone
Requires iOS 16 or later. - iPod touch
Requires iOS 16 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Danny Linsner