intermittent fasting tracker
Watch the flame grow with every hour you fast.
Burn is a clean, private intermittent fasting tracker. Start a fast and a live flame ring fills toward your fasting goal - anywhere from 12 to 48 hours, your choice - showing your projected end time and the metabolic phase you're burning through - from fat burning to ketosis to autophagy. Keep your streak alive, watch your weekly hours add up, and chart your weight and BMI over time. Everything stays on your device.
Built for anyone doing intermittent fasting - 16:8 and beyond. Track your fasting window, your streak, and your weight, all in one lightweight app that works offline.
Intermittent fasting tracker features
Live fasting ring
Every hour, right in front of you
Start a fast and a flame-colored ring fills in real time toward your fasting goal - pick anything from 12 to 48 hours in Profile. Fast past the goal and a hotter overflow lap keeps burning - so you always know exactly where you stand.
Metabolic phases
Know what your body is doing
As the hours pass, Burn labels the phase you're in: fed state, post-absorptive, glycogen depletion, fat burning, ketosis, autophagy, and deep autophagy.
Projected end time
See when your fast completes
The moment you start, Burn shows the clock time your fasting window closes - today, tomorrow, or later - and can send you a notification right when you hit it, so you don't have to keep checking. Toggle it off in Profile anytime.
Streaks & totals
Momentum you can see
Burn counts your consecutive fasting days and tallies your total fasting hours for the week, so consistency becomes its own reward.
Weight & BMI
Chart the trend, not the noise
Log weigh-ins and Burn plots a clean trend line of your recent entries, along with your current weight and BMI from your height.
Private by design
Your data stays with you
No account, no cloud, no server. Everything is stored locally on your device and works offline. Reset it all with one confirmed tap whenever you want.
Themes
Make it yours
Switch the whole app's look from Profile: Classic, a clean Light theme, a soft Pastel palette, or a cool Dark Blue. Your pick applies instantly and stays saved on your device.
lb or kg, automatically
No unit toggle to fumble with
Burn reads your phone's region and shows weight in the unit you already think in - pounds or kilograms - with no setting to dig through.
Bigger picture
A trend chart that grows with your screen
On a tablet or a wider window, the weight chart stretches out and plots up to 30 recent weigh-ins instead of 14, so long-term trends stay easy to read.
Screenshots
FAQ
How much does Burn cost?
Burn is a one-time $0.99 purchase on Google Play and the App Store. No subscriptions and no ads.
What fasting schedule does Burn use?
Burn defaults to a 16-hour fasting goal - a 16:8 style window - but you can set your own goal anywhere from 12 to 48 hours in Profile. Start a fast and the live ring fills as the hours pass, shows a projected end time, and keeps sweeping into an overflow lap if you fast longer than your goal.
What are the metabolic phases?
As your fast runs, Burn labels the metabolic phase you're in: fed state, post-absorptive, glycogen depletion, fat burning, ketosis, autophagy, and deep autophagy.
Can I track my weight?
Yes. Log weigh-ins and Burn plots a weight trend chart of your recent entries, plus your current weight and BMI calculated from your height and latest weigh-in.
Does Burn use the cloud?
No. Burn keeps all of your data stored locally on your device. There's no account and no server, and it works offline - it's your data, on your phone.
Does Burn show weight in kg or lb?
Burn detects your phone's region automatically and shows weight in whichever unit you already use - pounds or kilograms. There's no setting to configure.
Can I change how Burn looks?
Yes. Pick a theme from Profile - Classic, Light, Pastel, or Dark Blue - and the whole app recolors instantly. Your choice is saved on your device.
Does Burn notify me when my fast is done?
Yes - Burn can send a local notification the moment you hit your fasting goal, so you don't have to keep the app open and watch the clock. It's optional and can be toggled off in Profile at any time.