The Terminus widget shows one card from your set on the Lock Screen. Answer it in your head, tap to check, and rate it there.
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Free. For iPhone and iPad with iOS 26 or later. In English only.
Answer with no app to open
Tap the widget to see the answer over four buttons: Again, Hard, Good and Easy. Your pick sets when the card comes back, and the widget asks the next card.
On a locked iPhone, Face ID unlocks it before the tap works.
Which card it asks
The widget asks the card you are closest to forgetting. If you do not tap, the answer shows by itself 15 minutes later. When nothing is due, it says All caught up.
Home Screen too
Terminus also has Home Screen widgets, and a round Lock Screen widget with your daily goal and streak.
Add the widget
Touch and hold the Lock Screen, tap Customize, then Lock Screen.