Learn English with the shows you already watch

Know the words before you press play

Pick tonight’s episode. Duck finds the words you don’t know yet — at your level — and teaches them to you before you watch.

Start free
Coming soon to the App Store
Real decks from real subtitles Spaced-repetition flashcards AI tutor built in

See for yourself

A tiny sample deck — four cards, one minute.

1 · Set your level

A2 B1 B2 C1+

2 · Pick a title

Stranger Things Stranger Things Fallout Fallout The Office The Office A Knight of the Seven Kingdoms A Knight of the Seven Kingdoms Better Call Saul Better Call Saul Ted Lasso Ted Lasso Pulp Fiction Pulp Fiction Forrest Gump Forrest Gump Soul Soul Don't Look Up Don't Look Up The Fifth Element The Fifth Element
100,000+ movies and episodes inside

3 · Pick the words to learn

B2

would-be assassin

a person who tried to murder a public figure

Added Ignored
B2

fine and dandy

perfectly fine

Added Ignored
B2

sniper

a soldier who shoots from a hidden position

Added Ignored
B2

sole purpose

the one and only reason

Added Ignored
Your deck · 0

Learn before you watch

Preview the words

B2

sole purpose

the one and only reason

Pick your episode — we’ll suggest words and phrases from it, just above your level.

Enjoy — and notice

Frame from Forrest Gump

Gump! What's your sole purpose in this Army?

You catch the words you previewed — and that joy of recognition is a huge learning boost.

Remember forever

memory sole purpose 3 days 2 weeks 2 months forever

Each card comes back right before you’d forget it. The gaps grow until the word doesn’t need Duck anymore.

Built on proven learning science

  • Just above your level — where you learn fastest
  • Real scenes, not word lists — you remember the scene, 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
learning speed too easy your zone not yet ✓ dog ✓ week half measures lay low perfunctory obfuscate

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

Ask about a phrase. It’s already a card.

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.

For the word nerds

The parts we built because we wanted them ourselves.

  • FSRS-6 scheduler — state of the art, zero knobs to tune
  • CLI access to your deck, for your own tools and scripts
  • Export everything as JSON — your data is yours
  • Open API for adding cards from anywhere

$ duck cards add "hunker down"

✓ card built — hunker down (C1, phrasal verb)

$ duck deck export --json > my_words.json

✓ 1,284 cards exported

Ready for tonight’s episode?

Free to start. The words are waiting.

Start free