Recto

The answer is on the other page.

Verso · closed
Scroll to openPull up to open

Flashcards that unfold, for iPhone Duo. Open the phone, and the answer arrives letter by letter. Stop when you know it: the letters you needed schedule the card.

RectoVerso$14.99, once · no subscriptionNo account, nothing collected Coming to the App Store this autumn

Open it like a book.

RectoThe question stays on the left page.

VersoThe answer comes in on the right, as the hinge opens.

01 Closed A card fills the outer display.
02 Book The question on the left page, the answer on the right.
03 Tabletop Stood up: the question above the fold, the answer below.
04 Closed again After you answer, close it: the page turns.

The less you reveal, the later it comes back.

Comes back
Answered withLetters · rating
Right before a letter, rated Easy: comes back latest.
Right with 5 of 14 letters, rated Good: comes back later.
Right with 9 of 14 letters or more, rated Hard: comes back sooner.
Wrong, at any depth, rated Again: comes back soonest.

Illustrative: the real interval also depends on the card's history. From the ninth letter to the last it's the same rating.

What's known, and what's ours

On any iPhone, pull it up.

RectoVerso on iPhone 18 Pro Max, the answer pulled half up: la bibli and seven dotsRectoVerso on iPhone 18 Pro Max, the answer pulled half up: la bibli and seven dots

The same cards and the same measure. Slide the answer up with your thumb, as far as you need, then answer. The next card turns the page under it.

Portrait, one hand

Cards your way.

  1. 01

    Write them

    A prompt on the recto, the answer on the verso, with a hint, an example, a note or a picture.

  2. 02

    Make them from a text

    Notes, an article, a word list: Apple Intelligence drafts the cards on your iPhone.

  3. 03

    Import from Anki

    Your decks, pictures, sounds and schedule come across. Export back any time.

  4. 04

    Cards that lean

    Cards you only get with most of the answer showing are noticed; split or rewrite them.

  5. 05

    Practice

    Study a deck outside the schedule, before an exam. Nothing it does is kept.

  6. 06

    For everyone

    VoiceOver, Voice Control, Larger Text, Dark Mode and Reduce Motion, all the way through.

Nothing collected.

No account, no tracking. Your cards stay on your iPhone, and the app works offline. This website doesn't track you either. Privacy policy

RectoVerso $14.99, once. CHF 15 · €14.99. iPhone, iOS 27.1 or later.

Everything in it, for good: no subscription, no in-app purchase, no account.