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On the home screen, tap ‹ next to "Today" to step back a day (up to a year), then tap ✓ or ✗. You can also open a habit and tap any day in its calendar: tap once for green, twice for red, three times to clear.

A streak is the number of green days in a row, ending today. If you haven't marked today yet, your streak still counts through yesterday, so you have all day to check in. A red day or an unmarked past day breaks it. Rest days are skipped.

Yes. Turn on Settings → Home Screen → Single Check Button. Tap once for done, twice for missed and three times to clear.

In Sync counts the days in a row that every habit was green together, with rest days allowed. It's at the bottom of the home screen. Tap it to expand it, or pin it to the top.

Long-press a habit on the home screen for Reorder Habits, Archive and Delete, or swipe left on it. Archived habits keep their history and can be restored from Settings → Archived Habits.

Each habit earns them with its own streak: Wood at 14 days, Bronze at 30, Titanium at 50, RGB at 100 and Crystal at 365. With Auto-Apply Streak Rewards on (the default), the habit switches to the new finish when it gets there. You can always pick a finish it has earned in the habit's editor.

Yes. Go to Settings → Streak Rewards and turn off Achievement Popups or Animate Finishes. Animations also pause when Reduce Motion is on in your iPhone's Accessibility settings.

Touch and hold an empty spot on your Home Screen, tap Edit → Add Widget and search for Square Streak. To choose which habit a widget shows, touch and hold the widget and tap Edit Widget.

Reminders only appear if that day isn't marked yet and isn't a rest day. Check that notifications are allowed in your iPhone's Settings → Notifications → Square Streak. Opening the app now and then keeps a week of reminders scheduled ahead.

Up to 100 habits (the free version has 1), advanced stats, rest days and days-in-a-row goals. It's a one-time $3.99 purchase with no subscription.

Open Settings and tap Restore Purchase, making sure you're signed in with the same Apple Account you bought it with. Pro also works on any iPhone signed in to that account.

Purchases are processed by Apple, so refunds are requested through Apple at reportaproblem.apple.com.

Yes. Your habits and history sync through your iCloud account, so they're there on a new phone or after reinstalling. Make sure you're signed in to iCloud in your iPhone's Settings. You can also export everything as a CSV file from Settings → Data → Export History.

No. See the privacy policy.