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Sign in with the same Apple Account, open Sitlight, tap the gear on Today to open Settings, then tap Restore Purchases.

In Sitlight, open Settings and tap Manage Subscription. You can also open the Settings app on your iPhone, tap your name, then Subscriptions. Cancel at least 24 hours before the renewal date to avoid the next charge.

The Annual and Family plans start with 14 days free for new subscribers. If you cancel at least 24 hours before the trial ends, you won't be charged. Each person can have one free trial.

Apple handles payments and refunds. Request one at reportaproblem.apple.com.

The Family plan shares Pro with up to five other people in your Family Sharing group. They open Sitlight on their own device. If Pro doesn't show, they can tap Restore Purchases in Settings.

Check that Sitlight is installed on your watch: open the Watch app on your iPhone, tap My Watch and scroll to Sitlight. Wear the watch, unlocked, and check that Use Apple Watch during sits is on in Sitlight's Settings. The first time it opens, the watch asks for Health access; allow it.

Connect Apple Health in Sitlight (Settings › Apple Health) and allow Heart Rate. With the Sitlight watch app, your watch reads your heart rate every few seconds. Without it, watches and other devices measure only every few minutes, so a short sit may have no readings. Readings can also arrive late, so Sitlight checks again for two days.

Open the Health app, tap your profile picture, then Apps, then Sitlight.

No. Everything works on iPhone and iPad. The watch adds heart rate every few seconds and a tap on your wrist for each prompt and bell.

No. Your sits stay on the device where you recorded them. Anything saved to Apple Health appears in Health on your other devices as usual.

In Sitlight, Settings › Delete all sits removes your history, and deleting the app removes everything it stored. Anything saved to Apple Health stays there until you delete it in the Health app. See the privacy policy for more.