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You answer a short check-in about your goal, how your cycle usually runs, roughly where you are in it, and how much time and movement you can realistically give. FemFast uses that to time your fasting window, food, training and supplements to the phase you're in — then adjusts as you log.

Yes. Tell us you're not sure and FemFast starts you somewhere sensible and corrects itself as you log. Logging the first day of your next period is the single most useful thing you can do — after that, accuracy sharpens over the first six weeks.

No. Turn fasting off and FemFast still times your food, training and supplements to your phases — the timing is the point, not the fasting. If you keep it on, it starts gentle and lengthens only when you're ready.

FemFast is available for iPhone on the App Store. You can optionally connect Apple Health so weight, activity, heart rate and sleep import automatically instead of being logged by hand.

Because your physiology does. Insulin sensitivity, resting metabolism and appetite all shift across a cycle, so a plan that stays flat is wrong for roughly three weeks out of four. Yours moves the fasting window, the carbs and the training intensity to match.

Log or edit the start of your period in the app and the phase recalculates immediately, along with today's plan. If your cycle length has changed, FemFast picks that up over the next couple of cycles.

Any time, in settings. Food suggestions and protein and fibre targets update from the next day onward.

Energy and cravings usually shift within one cycle. Weight follows over two or three.

The check-in on our website is free and needs no signup. The app itself is a subscription: $9.99 for one month, $17.99 for three months (our most popular), or $47.99 for twelve months — about $4 a month. There's no free tier and no trial, but every plan carries a five-day money-back guarantee, so you can try it properly and get a full refund if it isn't for you.

Cancel any time in your App Store account settings; you keep access until the end of the period you've paid for. If you bought directly from us, email support@femfast.io from your account email and we'll cancel it. Cancelling stops future charges but doesn't refund the current period.

Yes — within five days of buying, for any reason. Email support@femfast.io from your account address and we'll refund you in full. After five days, purchases made through the App Store are handled by Apple's own refund policy via its "Report a Problem" page.

Open the app, go to settings and tap Restore Purchases while signed in to the same Apple ID you bought with. If it still doesn't appear, email us with the Apple receipt and we'll sort it.

Open My Account, scroll to Legal and tap Revoke my Consent & Delete Account. That withdraws your consent and removes your account and the data attached to it — no email required, nothing to wait for. We keep only what the law obliges us to keep, as set out in the Privacy Policy.

Yes. Request a portable copy from app settings or by emailing support@femfast.io, and we'll send it in a machine-readable format.

Yes. Cycle, symptom and nutrition entries are treated as special-category data and processed only with your explicit consent. They're never sold and never shared with advertisers. The Privacy Policy sets out exactly who processes what on our behalf.

Device tracking, yes — decline the prompt, or turn it off later in Settings › Privacy › Tracking on your device. The AI is not optional: it is what builds and rewrites your plan each day, so there is no version of FemFast without it. If you would rather it did not process your data at all, the way out is My Account › Legal › Revoke my Consent & Delete Account. What we process, and why, is set out in the Privacy Policy.