Learn English with flashcards and an AI tutor

Know the words before you need them

Duck finds the words you don’t know yet — at your level — and makes sure you remember them.

Cards from any text you paste Spaced-repetition flashcards AI tutor built in

Built on proven learning science

Just above your level — where you learn fastest
Real context, not word lists — you remember where you met the word, and the word comes with it
Spaced repetition, built in — the most proven method there is, with just two answers: know it, or still learning
Learn from what you love — strong feelings make strong memories

Your tutor learns your vocabulary word by word — and the zone moves with you.

Ask in the chat about any phrase and get a quick answer. Want to keep it for good? The card is already made — one tap adds it to your deck.

The rest of your cards live in the chat too:

Put it in your own words — type straight into the card before you save
Edit by asking — “shorten the back”, “add an example”, “delete the card about tax” — the chat shows the change and waits for your OK
Paste a text, get the words — the chat picks the vocabulary out of any text you paste, and the cards land in your deck to sort

Prefer a list? There is a plain cards page too.

The parts we built because we wanted them ourselves.

Works with

1
Connect your agent over MCP
2
Ask it to:
- add a word you met, with its sentence
- make cards from any text
- fix a card

Free to start, free forever. Go Pro when you want more.

forever

$4.99/mo

or $34.99/yr · 5 months free · $2.92/mo

Everything in Free
A much higher monthly limit for your tutor, explanations, and examples
Study-ready cards from any text you paste — built for your level, so you skip the manual work

Cancel anytime. 14-day money-back guarantee.