A calm language-learning toolkit · 34 languages
Learn languages by reading and writing — not just flashcards.
Lex combines leveled reading, AI essay feedback, and your own vocabulary in one calm workspace — for 34 languages.
Check your essay. Get your level.
Paste an essay in any of 34 languages and we'll estimate your CEFR level with specific corrections — no account needed.
The problem
Vocab apps drill cards but leave nowhere to actually use the language.
Duolingo gives you streaks. Anki gives you cards. Neither gives you a text to read or a place to write. So you end up bouncing between three tools — and never quite using the language. Lex puts reading, writing, and vocabulary in one place, so each one feeds the next.
Reading
Leveled texts. Tap any word to save it.
Read short pieces calibrated to your level — A1 through C2. Tap a word, get a translation, and add it to your vocabulary in one motion. Your reading becomes the source of what you study, instead of a separate app.
Writing
Essays with feedback on structure, mistakes, and level.
Pick a prompt, write an essay, and Lex gives you back specific feedback: where your structure breaks, which mistakes are blocking you, and how your level reads. The point isn't a grade — it's the next thing to fix.
Vocabulary
Saved words come back as exercises.
Every word you save — from a text, from a translation, from an essay — feeds into spaced-repetition exercises. You stop needing a second app, because the words you actually met are already there.
Coverage · 34 languages
The language you're learning is probably already here.
- 🇬🇧English
- 🇫🇷French
- 🇪🇸Spanish
- 🇩🇪German
- 🇮🇹Italian
- 🇵🇹Portuguese
- 🇳🇱Dutch
- 🇵🇱Polish
- 🇸🇪Swedish
- 🇳🇴Norwegian
- 🇩🇰Danish
- 🇫🇮Finnish
- 🇮🇸Icelandic
- 🇨🇿Czech
- 🇸🇰Slovak
- 🇭🇺Hungarian
- 🇷🇴Romanian
- 🇬🇷Greek
- 🇧🇬Bulgarian
- 🇭🇷Croatian
- 🇺🇦Ukrainian
- 🇷🇺Russian
- 🇹🇷Turkish
- 🇮🇱Hebrew
- 🇸🇦Arabic
- 🇮🇷Persian
- 🇮🇳Hindi
- 🇨🇳Chinese (Mandarin)
- 🇯🇵Japanese
- 🇰🇷Korean
- 🇮🇩Indonesian
- 🇻🇳Vietnamese
- 🇹🇭Thai
- 🇹🇿Swahili
11 languages have curated starter content right now — vocabulary by CEFR level, reading texts, and essay prompts. The other 23 are fully supported, you just bring your own words and texts.
Why not Duolingo, Anki, or LingQ
One quiet place, instead of three loud ones.
| Feature | Lex | Duolingo | Anki | LingQ |
|---|---|---|---|---|
| Read real texts at your level | ||||
| Writing with AI feedback | ||||
| Spaced repetition review | ||||
| One calm place — no juggling |
Pricing
Three tiers. Pick whatever fits.
The 3-day trial covers everything. After that, pick a tier or stop — Lex never charges you without you explicitly subscribing.
BasicVocabulary, exercises, all 34 languages.
$4/month
- Build vocabulary in any of 34 languages
- 5 exercise modes — flashcards, match-pairs, fill-blanks, multiple choice, typing
- Curated starter words across 11 languages
- Per-language CEFR tracking, A1 to C2
- No ads. No tracking.
- Most popular
ProAdd reading and writing.
$9/month
- Everything in Basic
- Write essays with 70+ curated prompts
- Reading section with a 60+ leveled library
- One-tap word lookup while reading
- Markdown export of your essays and texts
MaxAdd AI feedback and generation.
$19/month
- Everything in Pro
- AI essay feedback — up to 20 essays per day, with mistake list and CEFR estimate
- AI prompt generation — up to 30 prompts per day, calibrated to your level
- AI reading-text generation — up to 30 texts per day, your topic and length
- AI word translation while reading — up to 500 lookups per day
No card needed for the trial. Cancel anytime from the billing portal.
Questions
The things people usually ask first.
Do I need a card for the 3-day trial?
No. The trial lasts three days and doesn't require any payment details. If you want to keep using Lex after, you can subscribe at $4–$19/month. Nothing is charged automatically.
Can I cancel anytime?
Yes. Cancel from the Stripe billing portal in two clicks. You keep access until the end of the period you've already paid for, then it stops cleanly — no follow-up charges.
Which languages have curated starter content?
Eleven so far: English, French, Spanish, German, Italian, Portuguese, Russian, Turkish, Arabic, Japanese, and Mandarin. Each has six CEFR levels of vocabulary, ten reading texts per level, and essay prompts. The other 23 languages are fully supported — you just bring your own words and texts.
Does Lex work for absolute beginners?
Yes. A1-level vocabulary and short reading texts are calibrated for first-time learners. You don't need any prior knowledge to start a language from scratch.
What's the difference between Basic, Pro, and Max?
Basic ($4) is vocabulary and exercises in all 34 languages. Pro ($9) adds the writing and reading sections. Max ($19) unlocks the AI features — essay feedback with a CEFR estimate, AI text generation, smart word translations — all with generous daily caps so you can actually use them.
Where does the AI feedback come from?
Essay feedback, prompt generation, and word translations are powered by OpenAI's models. Your essays are sent to the model only when you ask for feedback — never to train it.
Start
Three days of Lex, free. No card.
Pick a language, save a few words, write your first essay. If it isn't for you, the trial ends on its own.