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Intermittent Fasting Timer

Fast smarter. Know exactly what your body is doing.

Track your fasting phases in real time, see when you enter fat burning and ketosis, and build lasting habits. Zero bloat. Available in 26 languages. No account required.

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4.8 rating · Free to use · No account required

Fasted timer screen showing fasting progress
How It Works

Start fasting in seconds

No setup, no account, no friction. Three steps to a healthier you.

1

Choose Your Protocol

Pick from 6 built-in protocols like 16:8, 18:6, or 20:4 — or create your own with Pro.

2

Start Your Timer

One tap to begin. Watch your fasting phases progress in real time on the circular timer.

3

Track Your Progress

Build streaks, review your history, and see how your body adapts over time.

Features

Everything you need, nothing you don't

A focused fasting timer built for simplicity and results.

Beautiful Circular Timer

A stunning ring timer that fills with color as you progress through each metabolic phase. Glanceable and motivating.

6 Fasting Protocols

16:8, 18:6, 20:4, 14:10, OMAD, and 36-hour extended fast. Choose what works for your lifestyle.

Streak Tracking

Build momentum with daily streaks. Complete your fasting window to keep the streak alive and stay consistent.

Fast Buddy

Pair with a friend to fast together. See each other's live timer, send cheers and reactions, and stay accountable with daily comments.

Hunger Map

Log hunger spikes during your fasts and discover your personal hunger pattern. See exactly when cravings peak and when they fade.

Achievements

Unlock badges for milestones like your first fast, streak records, and duration goals. Celebrate every win on your fasting journey.

History Calendar

Review every fast in a clean calendar view. See completed fasts, durations, and patterns at a glance.

Smart Notifications

Get notified when you enter a new fasting phase or when your fast is complete. Stay informed without obsessing.

Body Tracking

Log weight, water intake, blood levels, and body measurements to see how fasting impacts your body over time.

Real-time metabolic tracking

See what's happening inside your body

Fasted tracks 5 metabolic phases in real time so you always know where you are in your fast.

Fed State 0 – 4 hours

Your body is digesting and absorbing nutrients from your last meal. Blood sugar and insulin levels are elevated as energy is stored in cells.

Catabolic 4 – 8 hours

Blood sugar and insulin levels begin to drop. Your body starts using stored glycogen for energy as it transitions away from digestion.

Fat Burning 8 – 12 hours

Glycogen stores are depleting and your body increasingly switches to burning stored fat for fuel. This is where the metabolic shift begins.

Ketosis 12 – 16 hours

Your liver ramps up ketone production from fatty acids. These ketones become a primary fuel source for your brain and muscles.

Deep Ketosis 16+ hours

Autophagy accelerates — your cells recycle damaged components and repair themselves. Growth hormone levels rise, supporting cellular renewal.

Your fasting journey, visualized

See your consistency at a glance with a GitHub-style heatmap, detailed fast history, and weekly stats that show real progress.

Heatmap shows fasting consistency over months
Weekly and monthly streak summaries
Personal hunger map to learn your craving patterns
Weight, water, blood levels & body measurement tracking
Unlockable achievements and personal records
Export your data anytime (Pro)
Fasting Activity
142
Total Fasts
15.2h
Avg Duration
87%
Completion
Built Different

Why fasters choose Fasted

Other Fasting Apps

  • Fasting phases locked behind subscription
  • Require account creation to use
  • Bloated with recipes, articles, and meal plans
  • Ads and upsells throughout the app
  • No social accountability features
  • Require internet connection

Fasted

  • All 5 fasting phases included
  • No account needed — download and go
  • Focused timer only — no bloat
  • Zero ads, zero upsell nags
  • Fast Buddy — pair with a friend for accountability
  • Hunger Map — learn your personal hunger pattern
FAQ

Frequently asked questions

What is intermittent fasting?
Intermittent fasting (IF) is an eating pattern that cycles between periods of fasting and eating. It doesn't specify which foods to eat, but rather when you should eat them. Popular protocols include 16:8 (16 hours fasting, 8 hours eating), 18:6, and 20:4. Research suggests IF can support weight management, metabolic health, and cellular repair processes like autophagy.
Is Fasted really free?
Yes! The core experience is completely free — the fasting timer, all 6 protocols, metabolic phase tracking, streak counting, achievements, and smart notifications. Pro unlocks extras like the fasting buddy, hunger map, history heatmap, detailed analytics, custom protocols, notes, and data export.
Which fasting protocol should I start with?
If you're new to intermittent fasting, we recommend starting with 16:8 — fast for 16 hours and eat within an 8-hour window. It's the most popular and sustainable protocol. Most people simply skip breakfast and eat from noon to 8 PM. Once you're comfortable, you can try longer fasts like 18:6 or 20:4.
What are fasting phases?
As you fast, your body transitions through distinct metabolic phases: Fed State (0-4h) where your body digests food, Catabolic phase (4-8h) where blood sugar normalizes, Fat Burning (8-12h) where your body switches to burning fat, Ketosis (12-16h) where ketone production ramps up, and Deep Ketosis (16h+) where autophagy and cellular repair accelerate. Fasted tracks these phases in real time — for free.
Does Fasted work offline?
Yes, Fasted works 100% offline. Your timer runs locally on your device, and all data is stored on-device. No internet connection is ever required.
Do I need to create an account?
No account is needed. Download the app, pick a protocol, and start fasting immediately. Your data stays on your device — private and secure.
How many languages does Fasted support?
Fasted is available in 26 languages including English, Spanish, French, German, Portuguese, Japanese, Chinese, Korean, Arabic, Hindi, and more. The app automatically uses your device language.
How do I cancel my subscription?
You can cancel anytime through your device's App Store or Google Play subscription settings. You'll keep Pro access until the end of your billing period. The free tier remains fully functional after cancellation — you'll never lose access to the timer, phases, or streaks.

Start your fasting journey today

Download Fasted and see what your body is truly capable of.

Download on the App Store
Get it on Google Play