Intermittent Fasting - Window
Autophagy and Metabolic Timer
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
One tap starts your fast. Metabolic states shift live, from fat burn to autophagy. Log, streak and eating window tracked in one clean ring. No ads, no noise.
Window is the intermittent fasting timer built for people who take their health seriously. A clean circular ring tracks every hour of your fast - no clutter, just calm focus.
START FASTING IN SECONDS
Tap once to start. Your fast timer begins, your metabolic state updates in real time, and your streak grows with every completed fast. 16:8, 18:6, 20:4, OMAD - Window supports every protocol.
KNOW YOUR METABOLIC STATE
Watch your body shift through distinct phases: Fed, Ketosis, Fat Burn, and Autophagy. See exactly where you are and what is happening inside your body at each stage.
TRACK YOUR STREAK
A daily streak keeps you consistent. See your current streak, longest streak, total fasts, and total fasting hours - all updated automatically.
YOUR EATING WINDOW, CLEARLY MARKED
When your fast ends, Window opens your eating window. An amber indicator shows exactly when to eat and when to stop. Start your next fast when the window closes.
LOG HOW YOU FEEL
Record hunger, energy, and mental clarity during each fast. Over time, see your personal patterns in the Pattern Analysis section.
WINDOW PRO - GO DEEPER
- Pattern Analysis: understand your hunger, energy, and clarity trends across all your fasts
- Weight Tracking: log your weight after each eating window, see a 7-day moving average
- AI Fasting Coach: ask anything about fasting - protocols, science, troubleshooting
- Full history: all your fasts, no 30-day limit
WHAT MAKES WINDOW DIFFERENT
Clean. No ads. No gamification. No noise. Just your fast, your ring, and your streak. The design is built around the timer - because the timer is the product.
FASTING SCIENCE BUILT IN
- Metabolic state timeline: Fed, Ketosis, Fat Burn, Autophagy
- What breaks a fast: reference guide always one tap away
- Protocol guide: 12:12 through ADF explained
- Electrolyte and hydration reference
- Beginner progression guide
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Welcome to Window - your intermittent fasting timer. Track your fast, streak, and metabolic state in real time. Clean design, no noise.
The developer, Karol Jaworski, 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 Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Karol Jaworski
- Size
- 8.4 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18 or later.
- iPhone
Requires iOS 18 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Window Pro Yearly $39.99
- Window Pro Intro Year $39.99
- Window Pro Monthly $4.99
- Copyright
- © 2026 Karol Jaworski