You already fast every night.
FastMode makes it count.
A simple intermittent fasting tracker that shows what your body is doing — hour by hour. Free to start.
Download Free
Did you know you're already fasting right now?
If your last meal was at 7pm and you woke up at 7am, you just completed a 12-hour fast. FastMode picks up where you left off — and shows you what your body is doing while you sleep.
Three phases.
One ring.
Total clarity.
Start your fast
Set your eating window once. FastMode does the rest — tracking your fast from there.
Watch your body shift gears
At 12 hours, you enter Fat Burn. At 16, Peak Fat Burn. Your ring timer changes color as your body shifts gears — no guessing required.
Build the habit
Your streak grows every day you complete a fast. Life happens? Streak Freeze has your back. No all-or-nothing pressure.
Everything you need.
Nothing you don't.
Live Metabolic Phases
Your ring timer changes color as your fast deepens. Know exactly where you are, always.
Your Personal Goal Date
Enter your weight and goal once. FastMode calculates a realistic date — not "a few months," but the date.
No Calorie Counting
Track your eating window, not every gram. It's about when you eat, not what.
Streak System
Build a daily fasting habit. The longer your streak, the more you want to protect it.
Streak Freeze
Life happens. Freeze your streak for one day without breaking it. No all-or-nothing pressure.
Smart Notifications
Get notified when you hit Fat Burn, when your eating window is closing, or when your streak is at risk. Contextual, never spammy.
Weight Tracking & Trends
Log your weight daily. Watch the trend line move toward your goal. Over time, the data tells a story that the scale alone never could.
This isn't a trend.
It's biology.
Intermittent fasting triggers measurable metabolic changes — not theories, not influencer claims. After 12 hours without food, your body begins burning stored fat as its primary fuel.
After 16 hours, it enters peak fat-burning mode and begins autophagy — the cellular cleanup process recognized by the Nobel Prize in 2016.
FastMode shows you exactly when these thresholds happen. In real time. On your wrist.
2016 Autophagy research awarded Nobel Prize in Physiology
Referenced from Harvard Health Publishing and peer-reviewed research on intermittent fasting and metabolic health.
"Other fasting apps made me feel like I failed every time I missed a day. FastMode feels different — and Streak Freeze means I don't have to be perfect."
Monika, 34
Your body already knows how to fast.
FastMode just makes it visible.
Free to download. Available on iPhone and Android.
Download Free