We're the team behind Flips, a flashcard app built on the forgetting curve. A study habit we hear about constantly is the cover-and-recall method: you highlight key terms, then cover the answer with your hand, a sheet, or a strip of paper, and read down the page checking what you remember. It feels efficient — you can cover a lot of material quickly. But people who rely on it often hit the same wall: it goes fine while studying, then the words evaporate on test day.
If that's you, the problem isn't effort. It's that covering and reading mostly trains recognition, not recall — and recognition is the weaker of the two for long-term memory. Let's unpack why, and what to do instead.
Why covering feels like it works
The appeal is real: you can move through a whole page in minutes, and each time you uncover the answer it feels like a small win. That sense of fluency is exactly the trap, though. When you cover a word and then reveal it, your eyes often land on the answer before your brain has truly produced it — and the moment you see it, you think “yes, I knew that.” That feeling of knowing is not the same as being able to pull the word out of nowhere when the page isn't there.
In other words, the cover-and-recall method nudges you toward recognizing the answer once it appears, rather than retrieving it from scratch. Recognition is easy and reassuring, which is why studying this way feels productive even when little is sticking.
Recognition fades; retrieval lasts
The thing your brain strengthens is whatever you actually practice. If you practice spotting the right answer when it's shown, you get good at spotting answers — not at producing them. On an exam, in a conversation, or in real use, nobody hands you the answer to recognize; you have to generate it. That gap between “I recognized it” and “I produced it” is where cover-and-recall study quietly breaks down.
The fix is to make yourself fully commit to an answer before you reveal anything. The effort of digging a half-forgotten word out of memory is precisely the signal that tells your brain this information matters and should be kept. That effortful retrieval is called active recall, and it's the part the cover-and-recall habit tends to skip.
There's also no sense of timing
Even setting aside recognition versus recall, covering pages has a second blind spot: it treats every item the same. You sweep the whole page today, the whole page tomorrow, regardless of which words you already own and which keep slipping. Memory fades on a curve, and each word fades on its own schedule — so the smart move is to revisit a word right as it's about to fade, not to re-cover everything on a fixed loop. Cover-and-recall gives you no way to know when that moment is.
That's where we built Flips to help. First, it's built around real retrieval: in Card Mode you commit to the answer in your head, then flip to check; in Quiz Mode you choose from four options for instant feedback. Either way you produce the answer instead of merely recognizing it. Second, based on Ebbinghaus's forgetting curve, Flips schedules each word individually — words you get right get longer intervals, while words you miss or feel shaky on come back sooner, so your time goes to what's actually fading. Built-in decks for English, Spanish, Chinese and more, the option to make your own, review reminders, and it's free on iOS and Android.
The cover-and-recall method isn't worthless — covering an answer is a small step toward testing yourself. The limit is that it stops at recognition and ignores timing. Push it one step further: force yourself to recall before you reveal, and revisit each word right as it starts to fade. Do that, and the words stop evaporating the day after you study.
Flips
The flashcard app that shows you words right before you forget them. Review timing managed automatically by the forgetting curve. Free to start.
Learn more about FlipsFrequently Asked Questions
Is the cover-and-recall method completely useless?
No. Covering an answer is a step in the right direction because it asks you to test yourself. The limit is that it usually stops at recognizing the answer when revealed, rather than producing it from memory, which is what makes things stick.
What's the difference between recognition and recall?
Recognition is knowing an answer is right once you see it; recall is producing it with no prompt. Real exams and real use demand recall, so practicing recall is what builds durable memory. Covering pages tends to train recognition instead.
How do I turn covering into real recall?
Fully say or write the answer before you reveal anything. If you can't produce it, that word needs more review. Tools that force you to commit first, like flashcards or quizzes, make this automatic.
Why does timing matter on top of recall?
Each word fades on its own schedule, so reviewing everything on a fixed loop wastes effort. Revisiting a word right as it starts to slip strengthens it most. Flips schedules each word with the forgetting curve so you focus on what's fading.