How do I start and finish a fast?

Start tracking

Open Fasty's timer and tap Start Fast. The timer starts from now and uses your current goal. Starting and finishing in the iPhone app do not require Pro. If a widget or Live Activity button opens the Pro screen, see why the paywall appears.

If you already began fasting, you can correct the start time. For a fast that already ended and was never recorded, add a missing fast.

End and save a fast

Tap End Fast, or Complete Fast if you reached the goal.
Review Started fasting and Ended fasting. Tap Edit beside either time if you forgot to start or stop the timer at the right moment.
Tap Save. You can find the record in Statistics → Data (tray icon, top-left corner) → Fasting.

If you opened the finish dialog accidentally, close it with × or swipe it down. The fast continues. Use Delete in that dialog only if you want to discard the active fast without adding it to your completed records.

If you continue past your goal

Reaching the goal does not finish or save your fast automatically. The timer continues counting. End it and tap Save when you want to keep the record.

An alert or daily reminder does not start or stop it for you. To automate those actions, see Shortcuts automations.

What appears afterward

Fasty can show an eating-window countdown or time since the last fast. See what the timer shows for how those displays work.