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You don't have to - you can enter your cycle details manually. But we strongly recommend it. Apple Health integration keeps your cycle data accurate automatically, which means better, more personalised fasting recommendations from day one.

In most cases, yes, through Apple Health. FastingBestie reads your period data from Apple Health, so any tracking app that saves to Apple Health will flow through to us automatically once you give permission. We never connect to other apps directly, which keeps your data private and in your control.

Any app that saves your period data to Apple Health. That includes Apple's own Cycle Tracking, Clue, Natural Cycles, and Stardust. Flo no longer offers Apple Health sync, so Flo data can't be brought across automatically. If your app isn't listed, check whether it has an Apple Health connection in its settings.

No. It's set and forget. After the one-time setup, each period you log in your other app saves to Apple Health, and FastingBestie picks it up on its own, even when the app is closed. There's no sync button to remember and nothing to repeat.

Only your menstrual flow data, which is what we need to work out your cycle phase and tailor your fasting recommendations. We don't read anything we don't need. Your data stays on your device, and you can turn the connection off any time in your iPhone's Health settings.

Two quick steps, done once. First, in Clue, turn on the Apple Health connection (Clue settings, Connect to Apple Health). Then in FastingBestie, connect Apple Health and allow read access to your cycle data. After that, anything you log in Clue flows through automatically. You won't need to sync again.

Not automatically. When you switch on Clue's Apple Health connection, Clue starts saving new entries from that point forward, but it doesn't send across what you logged before. That's why we ask for your most recent period start date when you set up FastingBestie, so your recommendations are accurate from day one. Your cycle picture then fills in naturally as you keep logging.

Flo has removed its Apple Health connection, so there isn't a way to bring Flo data across automatically right now. The good news is you can enter your cycle details manually in FastingBestie in under a minute, and everything works fully from there.

Absolutely. Just enter your most recent period start date and your usual cycle and period length when you set up the app. That's all we need to start giving you phase-based recommendations. No other app or device required.

Welcome, this is a lovely place to begin. Enter your best estimate of your last period start date to get going, and the app will guide you from there. If you'd like it to stay accurate automatically, you can start logging in Apple Health (or Apple's Cycle Tracking), and FastingBestie will keep itself up to date for you.