Once a card comes up in a review session, there are two steps: flip it to see the back, then rate how well you remembered it. This article covers both, and what happens the moment you tap a rating.
Flipping the card
A card starts with only the front showing. Tap anywhere on the card to reveal the back.
Try to answer before you flip. Flipping early and then rating honestly still works, but it defeats the point: the rating is supposed to reflect what you actually recalled, not what you read a second ago.
The four ratings
Once the back is visible, four buttons appear: Again, Hard, Good, and Easy. Tap the one that matches how recall felt.
| Rating | What it means | Rough effect |
|---|---|---|
| Again | You didn't recall it. | The card is sent into (or back into) short, closely-spaced steps, regardless of what state it was in before. |
| Hard | You recalled it, but it took real effort. | The card advances, but by less than a Good would give it. |
| Good | You recalled it at the effort you'd expect. | The card advances on a normal schedule. |
| Easy | You recalled it with no effort at all. | The card advances further than Good, and skips ahead faster. |
This is a rough guide, not the full scheduling logic. The states these ratings move a card between (New, Learning, Review, Relearning) are defined in Card states and maturity. The FSRS calculations behind the scheduling itself, and why rating honestly matters, are covered in Learning methodology.
The interval preview
Above each button, a small number shows how long flangu expects to wait before showing you this card again if you pick that rating. For example, Good might show 3d while Easy shows 6d.
This isn't a fixed table. It's calculated live for the specific card in front of you, using its current progress and the deck's retention setting. Two cards can show completely different intervals for the same rating. To change how aggressive or conservative these predictions are for a deck, see Deck settings.
Note
If a preview can't be calculated, the button shows — instead of a number. This means the prediction wasn't available, not that the interval is zero.
Reviews are permanent
Once you tap a rating, that review is recorded and can't be edited or undone. There's no way to go back and change a rating after the fact, even from the card's detail screen.
This is why rating honestly matters more than it might seem. A card you didn't really know, rated Good anyway, doesn't disappear as a problem. It just resurfaces later, on a schedule that now assumes you know it better than you do.