You've tried cutting carbs.
You haven't tried this.
Intermittent fasting works — but only when you track it. Atara shows you exactly which metabolic phase your body is in, in real time. No diet. No supplements. Just a window.
Most diets fail before week two. Here's why.
It's not your discipline. It's not your genes. It's that every diet asks you to fight your biology — count calories, resist cravings, change everything you eat. Your brain is not wired to sustain that. Intermittent fasting works with your biology instead of against it. You don't change what you eat. You change when. And that changes everything.
Not a diet.
A biological window.
Every hour you fast, your body moves through distinct metabolic phases. Atara visualizes these milestones as you reach them.
Sugar Burning
Body burns recent dietary glucose.
Transition
Liver starts hunting for alternate fuel.
Ketosis
Body switches to burning stored fat.
Autophagy
Cellular cleanup and repair kick in.
A 16:8 window reaches both ketosis and autophagy — every day, no supplements.
Fasting works for everyone.
Your reason makes it yours.
Tap or hover to explore different reasons
One less thing to think about. Every day.
Every meal is a decision — what, when, how much. Fasting collapses that to a window. No breakfast debate, no 11am snack guilt.
The fast you track
compounds.
Memory is unreliable. Intention without data is just hope. Tracking turns fasting from a habit into a system.
Start Tracking FreeIntention without data is just hope — and hope is why most fasting streaks end at day 3.
Level Up Your Fast
without spending a dime.
Fasting does 80% of the work. These three ancient tools (used by Stoics, SEALs, and top biohackers in 2026) do the rest — with zero extra time or money.
That's it. No gadgets. No $300 stacks. Just simple reminders to your body.
Sauna
20–30 min, 4–7× week
40–66% lower risk of heart disease & dementia (2026 data)
Heat shock proteins + deeper autophagy when done post-fast.
Cold Exposure
2–3 min cold shower
Activates brown fat, massive dopamine boost, faster fat burn
Perfect finisher on fasting days.
Wim Hof Breathwork
10 min morning
Cuts inflammation, calms the nervous system, skyrockets energy
Best done at the start of your fast.
Unlock the Blueprint
Want the exact protocols, weekly schedule, safety notes + all the March 2026 studies? Get our definitive guide for free.
Download Free BlueprintNo Email Required • Instant Access • PDF Guide
Choose Your Protocol
Whether you are a beginner starting with Circadian rhythms or an expert following the Warrior protocol, Atara provides the perfect structure for your goals.
Beginner friendly
Easy start
Most popular
Experienced
Expert level
Your own plan
Insights Powered by AI
Atara doesn't just track time. It analyzes your habits. Our AI Coach provides personalized metabolic insights based on your unique fasting history.
78
Day Streak
91%
Goal Success
Celebrate Your Streaks
Your discipline deserves recognition. Atara generates gorgeous, minimalist share cards for Instagram and beyond, so you can inspire others with your journey.
With regular fasting you increase your wellbeing
See how you start on low energy and poor sleep, but end up reaching the peak with high energy, sharp mental clarity, and deep, restorative sleep.
Your fasting journal, reimagined
Track not just hours, but how you feel. Note your energy levels, mood, cravings, and breakthroughs. Build a personal record of your metabolic journey.
- Quick mood & energy check-ins
- Track cravings and how you overcame them
- Celebrate wins with personal notes
- AI-powered insights from your patterns
Everything You Need
Built for serious fasters who want to understand what's happening inside their body.
Know exactly where your body is — right now
Watch your body shift from sugar-burning to fat-burning to autophagy in real time. No guessing. No biology degree required.
See what's working before you feel it
Streaks, completion rates, weekly trends — your data tells you what's improving before your body does.
A plan matched to where you are — not where you wish you were
From 12-hour Circadian to 20-hour Warrior. Start where you are. Progress when you're ready.
On your home screen in 3 seconds. No App Store.
Tap Share → Add to Home Screen on iOS. Tap Install on Android. Done. No account. No tracking by Apple or Google.
Bulgarian & English
Fully localized in Bulgarian and English. Switch languages instantly without losing your data.
Share Your Progress
Generate gorgeous share cards for Instagram, TikTok and Pinterest directly from the app.
Start free. Upgrade when you're ready.
No hidden fees. Cancel anytime. Your data stays yours.
Atara Core
Free forever
- Core fasting timer
- 2 preset plans
- Last 30 days history
- Basic metabolic phases
Monthly
Not available yet
- AI Metabolic Coach
- All fasting plans
- Unlimited stats
Launching soon — join the waitlist to get 3 months free at launch.
Install Atara in 3 seconds
(no App Store required)
Atara is a Progressive Web App. That means zero App Store fees, total privacy, and instant installation directly to your home screen.
How to Install →Ready to start fasting smarter?
Join Atara. Your body has been waiting for this.
Start Your Free Trial →Common Questions
I've tried fasting before and quit. Why would this be different?
Most people quit because they track mentally — checking the clock, estimating, guessing. Atara removes all of that. You start a timer. You get a notification when you hit each phase. You see your streak. The app does the cognitive work so you don't have to. Tracking doesn't make fasting harder — it makes quitting feel worse than continuing.
What is a PWA and why do you use it?
A Progressive Web App (PWA) looks and feels like a native app but runs in your browser and on your home screen. We use it to bypass the 30% App Store 'tax' and because it keeps your data 100% private, without Apple or Google tracking your fasting habits.
Can I suggest new features?
Yes! Atara is in active development. You can reach out directly to the creator on X (Twitter) @builtbygeo or via email. We love hearing from our metabolic practitioners.
Getting into fasting is one of the top 3 most important things I've done in my life.
— Phil Libin
former CEO of Evernote
Intermittent fasting is the #1 free biohack.
— Gary Brecka
biohacker & founder of 10X Health
The best of all medicines are resting and fasting.
— Benjamin Franklin
Founding Father & Polymath