HealthyFast: Calorie & Fasting

Fasting, calorie and strength training — in one clean, ad-free app:


* Fasting timer with 7 science-backed zones
* AI meal logging — describe or photograph for instant calories & macros
* Guided strength training — Programs with form guides
* Full Wear OS app — track fasts and log workouts from your wrist
* Journal & Insights — history, trends and weight tracking
* Health connect integration


THE FASTING TIMER IS FREE. FOREVER.

Start a fast with one tap and let the live ring guide you through 7 metabolic zones — from Fed State to Deep Renewal — each with practical, science-backed information. Track 16:8, 18:6, 20:4 and more, and get a notification the moment you enter a new zone or reach your goal. No ads, ever.

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


CALORIE & MACRO LOGGING


Log a meal by describing it in plain words — "2 eggs, a slice of bread and coffee with milk"
Or snap a photo of your plate — the same on-device AI reads it and fills in the description for you
On-device AI estimates calories, protein, carbs and fat instantly
100% private: both text and photo are processed on your phone, so your food data never leaves the device — no account, no cloud
See today's intake against your estimated daily burn at a glance
A quick 6-question Energy Profile estimates the calories you burn each day


STRENGTH TRAINING


5 proven programs from beginner to advanced — full-body, upper/lower, push-pull-legs and a classic split
Automatic weight progression and deloads handled for you
Built-in form guides with illustrations and cues for every exercise
Log full guided sessions, or quick-log any workout in seconds
Sessions survive navigation — pause and resume anytime


WEAR OS APP

Track and control everything from your wrist — the watch app runs on its own:


Start, stop and adjust your fast and see your current zone at a glance
Log a full strength workout — pick your program, workout and sets right on the watch
Tile, watch face complications and an ongoing activity that keep your fast one tap away


JOURNAL & INSIGHTS


Monthly calendar with your complete history — free
Daily summary: hours fasted and calories eaten at a glance
Premium Insights: longest fast, averages, calorie and training trends by month, quarter or year
Weight trend, nutrition patterns and estimated micronutrient coverage


PRIVATE BY DESIGN

Your data stays on your phone. The meal AI runs fully on-device. No account required.

Meal AI — both text and photo logging — 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 you can still log meals in text, and the timer, zones, training and Wear OS features all work as normal.

MORE PREMIUM FEATURES


Health Connect — fasts, meals and workouts sync both ways with your other health apps
Custom fasts up to 14 days and custom milestone alerts
One affordable subscription unlocks everything


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
Fasting, food and training in one app instead of three


Download HealthyFast and make your next fast — and your next workout — 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 or exercise routine, especially if you are pregnant, have a medical condition, or take medication.