HealthyFast

HealthyFast is a clean intermittent fasting tracker. Start a fast with one tap and let the live fasting ring guide you through 7 metabolic zones — from Fed State to Deep Renewal — with practical, science-backed information at every stage.

Track 16:8, 18:6, 20:4 and more. Get a notification the moment you enter a new zone or reach your goal. No ads.
7 SCIENCE-BACKED FASTING ZONES

Fed State, Early Fast, Glycogen Burning, Metabolic Switch, Fat Burning, Autophagy and Deep Renewal
The live ring shows exactly where your body is right now
Tap any zone to read what's happening inside you and the science behind it
Milestone notifications that arrive on time

WEAR OS APP
Track and control your fast right from your wrist.

Start, stop and adjust your fast, and see your current zone at a glance.
Watch face complications — show elapsed or remaining fast time; tap to jump straight into the app. Also comes with a tile


AI MEAL LOGGING (PREMIUM)
Describe your meal in plain words — "2 eggs, a slice of bread and coffee with milk" — and on-device AI estimates calories, protein, carbs and fat instantly. 100% private: the AI runs on your phone, so your food data never leaves the device. No account, no cloud.
Meal AI needs a phone with on-device generative AI. Best supported:

Google Pixel 8, Pixel 9 and newer — Tensor chip with Android AICore
Samsung Galaxy S25 and S26 series, Z Fold6 / Z Fold7, Z Flip6 / Z Flip7 — on-device Galaxy AI

On other devices the timer, zones, journal and Wear OS features all work as normal.
JOURNAL & STATS

Monthly calendar with your complete fasting history — free
Daily summary: hours fasted and calories eaten at a glance
Premium stats: longest fast, averages and totals by month, quarter or year

MORE PREMIUM FEATURES

Health Connect — completed fasts and meals sync automatically to your other health apps
Custom fasts up to 14 days and custom milestone alerts

WHY HEALTHYFAST?

Free fasting timer with zero ads
Private by design — your data stays on your phone
Built for Android: Material You design, Wear OS and Health Connect
One affordable subscription unlocks everything

Download HealthyFast and make your next fast your best one.
Note: HealthyFast is a wellness and education tool and is not a substitute for professional medical advice. Talk to your doctor before starting any fasting routine, especially if you are pregnant, have a medical condition, or take medication.