The simplest intermittent fasting tracker — built for real life, backed by science.
Free to download
We designed FastFit around the struggles real fasters face.
Calorie counting is exhausting. Fasting is simpler and backed by science.
Our smart window timer tells you exactly when to eat — and when to stop.
Alternating fasting protocols breaks plateaus without extra effort.
Optimised fasting windows restore metabolic flexibility and mental clarity.
Simple tools that keep you consistent and informed.
One-tap start & stop with real-time progress ring and completion alerts.
Visual charts for weight, BMI, and body-fat trends over weeks and months.
Personalised eating-window meal suggestions and hydration reminders.
Expert-curated protocols from beginner 12:12 up to advanced OMAD.
Intelligent scheduling that syncs your fasting window with your sleep cycle.
Start fasting in three simple steps.
Free on iOS and Android. No account required to start.
Pick from 12:12, 14:10, 16:8, 18:6, 20:4 or OMAD.
Your personalised countdown begins immediately.
Log weight, review insights, and hit your milestones.
From beginner-friendly to advanced — pick what fits your lifestyle.
Fast for 12 hours, eat within a 12-hour window. A gentle start for beginners.
Fast for 14 hours, eat within a 10-hour window. Great for building the habit.
Fast for 16 hours, eat within an 8-hour window. The most popular method.
Fast for 18 hours, eat within a 6-hour window. For experienced fasters.
Fast for 20 hours, eat within a 4-hour window. Advanced level.
Science-backed guides to help you fast smarter.
A beginner-friendly introduction to IF and how it works.
Stay hydrated without breaking your fast.
Know exactly what keeps you in — and kicks you out of — a fasted state.
The biology behind why fasting transforms your metabolism.
Understanding the metabolic condition that drives weight gain.
What the research says about IF's impact on your health.
Intermittent fasting (IF) is an eating pattern that cycles between periods of fasting and eating. The most popular method is 16/8 — fasting for 16 hours and eating within an 8-hour window. FastFit makes it easy to track your fasting schedule, monitor weight progress, and stay consistent with smart reminders.
Download FastFit free and start your first fast today.