Your Body Loves
Unpredictability
Escape the monotony of fixed fasting schedules. Our intelligent randomization keeps your metabolism engaged, preventing adaptation plateaus while you see sustained results.
Free to start. No credit card required.
Adaptive Windows
16:8 today, 18:6 tomorrow. Your fasting schedule adapts to prevent metabolic slowdown and keep results coming.
Track Progress
Monitor weight, energy, mood, and more. Beautiful charts reveal patterns you never knew existed.
Gentle Guidance
Timely reminders, educational insights, and encouragement when you need it most. Your wellness companion.
Why Most Fasting Apps Fail You
The Problem
Fixed schedules like "always 16:8" let your body adapt. After a few weeks, weight loss stalls, energy dips return, and you wonder if fasting even works. It's not you — it's metabolic adaptation. Your body is smarter than your schedule. Learn about metabolic health →
Our Solution
Random Fast varies your fasting windows intelligently. Some days 16 hours, some days 18, occasionally 14. Your metabolism can't predict it, so it can't adapt. You get results that last instead of another plateau.
Everything You Need to Fast Smarter
Simple tools that work. No bloat, no complexity, no subscription required.
Smart Randomization
Algorithm-generated fasting schedules that prevent metabolic adaptation while respecting your lifestyle constraints.
Progress Tracking
Log weight, mood, energy, and hunger. See trends over time with clear charts that show what's working.
Works Offline
Install on your phone like a native app. Track fasts even without internet — syncs when you're back online.
Smart Notifications
Get reminded when your fast ends. Customize notification timing and sounds to match your preferences.
Mood & Energy Logging
Track how fasting affects your day-to-day wellbeing. Discover patterns between fasting and how you feel.
Export Your Data
Your data belongs to you. Export everything as JSON or CSV anytime. No lock-in, ever.
How Random Fast Works
Set Your Preferences
Tell us your preferred fasting range (like 16-20 hours) and any scheduling constraints. Random Fast respects your lifestyle — we won't suggest a 20-hour fast on your busiest day.
Get Your Daily Schedule
Each day, we generate a fasting window within your parameters. Different enough to prevent adaptation, manageable enough to actually complete. No extreme swings, just smart variation.
Track and Improve
Log how you feel each day. Over time, you'll see patterns emerge — which protocols work best for your body, what times suit your energy, and how fasting affects your life.
"The body adapts to predictability. Introduce variety, and you give it something new to respond to."
The principle behind metabolic flexibility. Explore the research →
Common Questions
Is Random Fast really free?
The core fasting tracker is free — we believe basic fasting tracking should be accessible to everyone. Premium features like schedule randomization and data export are available with an optional subscription.
How random is 'random'?
Intelligently random. We don't suggest a 24-hour fast followed by a 12-hour fast. The algorithm keeps variations reasonable and respects the preferences you set — think gentle waves, not chaotic spikes.
What if I can't complete a suggested fast?
No problem. End your fast early if needed — we track actual completion, not just plans. Random Fast adapts to reality, not the other way around. There's no guilt here.
Do I need to create an account?
Yes, an account lets us save your data across devices and keep your history. We only ask for an email — no personal information required beyond that.
Can I use this on my phone?
Absolutely. Random Fast is a Progressive Web App — add it to your home screen and it works just like a native app, including offline mode. No app store download needed.
Is my data private?
Your fasting data stays private. We don't sell your information, and you can export or delete everything at any time. You own your data.