Features

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No annoying onboarding process, no useless questionnaire, no credit card required for trial. Create your flashcards and start practicing in seconds.

Create an unlimited number of dual card decks, with an unlimited number of dual cards.
A dual card is a card with 2 sides. For each side, you can upload an image, and/or add text in plain text, markdown or HTML. You can choose to have swappable sides (practice in both directions).
Generate text-to-speech audio for either side of your cards, in bulk with one click.
You can see what practice sessions with dual cards look like on the Geography quizzes page.

Create an unlimited number of checkbox card decks, with an unlimited number of checkbox cards.
A checkbox card has 3 parts:
1. Prompt: add text or images using plain text, markdown, or HTML.
2. Propositions: add 1-9 options and mark the correct answer(s).
3. Details (optional): add text or images to explain the answer(s).
You can see what practice sessions with checkbox cards look like on the JavaScript quizzes page.

In any deck, you can create dozens of cards at once.
You can name and rename your decks.
You can also name and rename your cards if you want to. Card names are practical for sorting your cards by name within a deck. However, card names do not appear in practice sessions.

Each card saves a mastery score.
For dual cards: you indicate whether you master the card or not, by clicking either on the "To review" or "I master" button.
For checkbox cards: we automatically detect if you got the right answer or not, based on the checkboxes you clicked and submitted.
These mastery scores let you use practice strategies that prioritize cards you do not master yet.

All of your cards and decks are private by default. No one else can see them.
With paid access, you can export and import cards via CSV files, a simple way to share cards with other OptiLeague users or back up your work.
The format of the CSV to import cards is detailed on the import page when you are logged in with your account.

Practice in any modern web browser on desktop, tablet, or mobile. Works on Chrome, Safari, Firefox, Brave, Opera, and more
Practice cards from a specific deck, or practice cards from all decks at once.
You can tag your decks with 1 or several tags. You can target the decks to practice with by tag.
You can set cards or decks to inactive, so that they are not used in your practice sessions.
You can customize your practice session by setting the practice strategy you want to use.
In practice sessions for checkbox cards, we also automatically randomize the order of the propositions.