Permanently expand your vocabulary — through crossword puzzles generated for you.
Lexi runs real spaced repetition underneath dynamically generated crosswords. Reviews are fill-in-the-blank sentences, not card flips. Grading is inferred from your solve speed. And every new word is introduced with an illustrated card before you're asked to recall it.
Download free on the App Store
iPhone & iPad · free · no account required
This is a review in Lexi
![A Lexi clue exactly as it appears in-game: 'Calling for a poetry truce in the middle of the bar fight was brave, if a bit [adj].' Hint: foolishly guided by noble ideals rather than practical reality.](/img/clue-quixotic-1.jpg)
A sentence with the word missing, plus a hint that evokes the meaning. You retrieve quixotic from a situation — the way you'll actually need it — with crossing letters as scaffolding when you half-know it.
Every word cycles through multiple differently-phrased clues under one spaced-repetition schedule. There is no fixed phrasing to memorize, so what sticks is the word.
Why not flashcards?
- Definition cards overfit. The prompt never changes, so you end up recognizing the definition's phrasing instead of commanding the word. Lexi varies the surface every repetition and keeps the schedule unified.
- Self-grading is decision fatigue. No Again/Hard/Good/Easy: your solve speed — normalized for clue and word length — raises or lowers each word's ease automatically.
- Cold first reps are brutal. Flashcards quiz you on words you've never seen. In Lexi, every first encounter starts with the word's illustrated card: image, definition, pictured example sentence, connotation tags.
- Clue quality can't be improvised. Each clue is produced by a creator → validator → guesser → reviser pipeline, up to seven revisions before acceptance — and keeps improving through in-app feedback.
What's inside
- 20,000 words ordered roughly by rarity — maximal real-world utility per unit time spent
- Synonym nuance: tap any two synonyms to read precisely how they differ
- Collections that steer generation: save words, and puzzles prioritize words with related meanings
- Multiplayer, leaderboards, streaks, achievements, an activity heat map
- Reminders fired from words actually due, not a fixed daily nag
- Profiles under one iCloud account — separate progress for you and your kid on the same iPad
- Typo detection: near-misses get a "likely a typo" toast, not a wrong answer
Who it's for
People who want a bigger English vocabulary and a system that actually runs itself: readers and writers, GRE/SAT preppers, advanced ESL learners going from fluent to eloquent, and word-game players who want the time to count for something. English, on iPhone and iPad.