FastZen - Fasting Tracker

Track your intermittent fasting with a beautiful, privacy-first timer. See your fasting zones in real time and build healthy habits with streak tracking.

FastZen is a beautifully designed intermittent fasting tracker that helps you fast smarter, not harder. Built with privacy at its core, all your data stays on your device.

FASTING TIMER Start and stop your fasts with a single tap. A stunning circular progress ring shows your elapsed time, remaining time, and current fasting zone in real time. Watch your progress as you move through each metabolic phase.

FASTING ZONES Understand what happens to your body at each stage of your fast:

• Fed (0-4h): Digestion and absorption
• Early Fast (4-12h): Blood sugar stabilizes
• Fat Burn (12-18h): Fat oxidation increases
• Ketosis (18-24h): Ketone production ramps up
• Deep Ketosis (24h+): Maximum autophagy benefits

FLEXIBLE PLANS Choose from popular intermittent fasting schedules:

• 16:8 Intermittent (most popular)
• 18:6 Extended
• 20:4 Warrior
• OMAD (One Meal A Day)
• Custom duration

TRACK YOUR PROGRESS Review your fasting history with completion percentages. See how consistently you reach your fasting goals and track your streak of consecutive successful fasts.

SMART NOTIFICATIONS Get notified when you complete your fast or enter a new fasting zone. Haptic feedback keeps you informed of important milestones without needing to check your phone.

100% PRIVATE FastZen collects zero data. No analytics, no servers, no accounts. Everything stays on your device. Your fasting data is yours alone.

DESIGNED FOR YOU Dark mode first design with beautiful gradient backgrounds that change based on your current fasting zone. Clean, focused interface that helps you stay motivated.

Whether you're new to intermittent fasting or a seasoned faster, FastZen gives you the tools to build and maintain a healthy fasting practice.