Track Fasts, Ketosis & Daily Progress

Fast Smarter.
Feel The Difference.

The science-backed app for intermittent fasting. Start a fast, follow a program built around your goals, and watch your health improve one day at a time.

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You are now Fasting

Jan 23, 2025

Fasting Time 14:10:45 Time Remaining · 9 hrs until 7:00 PM

You are in Ketosis

Your fasting streak

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Ketosis Live status

Fasting 16:8 window

Learn Science articles

AI Coach WellFast AI

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Features

Everything Your Fasting Journey Needs

Science-backed fasting tools designed for managing chronic conditions and optimizing health.

Smart Fasting Tracker

Start a fast and watch your timer, ketosis status, and daily progress in one place. Log meals, water, activity, sleep, and mood with quick daily check-ins.

Eating & fasting windows
Live ketosis status
Daily log & fasting streaks

Programs for Every Goal

A plan for your blood pressure, your joints, your hormones, and more. Challenges like the 14-Day Fasting Challenge and Insulin Reset keep you on track.

WellFast AI Coach

Ask our AI and get intelligent, context-aware answers about fasting, your symptoms, and your goals - grounded in what you have logged.

See Inflammation Drop

Log symptoms like joint pain, fatigue, and headaches, then watch your inflammation score drop week after week. Feel the difference.

Learn & Community

Learn the science behind your success with expert articles, and stay motivated with challenges and a community that understands. Finally.

How It Works

Three Steps to Feeling The Difference

Pick Your Program

Find your perfect fasting plan and set your goal - from a classic 16:8 window to a 14-Day Fasting Challenge.

Start Your Fast

Track your fasting window, ketosis status, and daily log in one tap. Your streak grows with every completed fast.

Feel The Difference

Log symptoms, learn the science behind your success, and watch your inflammation score improve week by week.

Fast Smarter.Feel The Difference.