FastFlow
Fasting tracker that reads your Garmin live
FastFlow launched on August 5, 2026 with 3 votes, #2,940 of 23,274 launches that month and more than 50% of that year's launches.
What it does
FastFlow is the only fasting tracker that connects to your Garmin and Apple Watch in real time over BLE. Instead of a countdown, it coaches you through six metabolic stages — Fed, Clearing, Shifting, Burning, Cleansing, Renewing — while showing live heart rate, HRV, Body Battery and stress. iOS Live Activity + Dynamic Island keep your fast a glance away. Built for people 40+ who want to work with the body, not against it.
FastFlow is the only fasting app that reads your Garmin and Apple Watch in real time — and coaches you through every metabolic stage. Free with Premium.
The only fasting app that reads your Garmin and Apple Watch in real time — and coaches you through every metabolic stage. You don't just see a timer. You see your fast working. Connect your Garmin or Apple Watch and FastFlow reads your body in real time — so every stage transition reflects what's actually happening inside you, not just a clock. FastFlow maps your fast through six metabolic stages and tells you what's happening in your body — and what to do with each stage. Tap a stage to explore. Every feature is built to make fasting a sustainable habit — informed, calm, and personal. After each fast, the Coach reviews it against your own baseline — "your HRV held 9ms above your usual" —…from fastflowapp.com
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