Translation that understands context
Smart Translator reads the whole sentence, so idioms and set phrases are translated the way they are actually used — not word by word.
Booklex /ˈbʊk.lɛks/ noun a book you learn a language from
Learn languages by reading the books you love
Read Spanish, French, German or Italian books in the original. Tap any word for an instant translation in context, save it, and Booklex brings it back right before you forget.
- 50+ languages
- Works offline
Capítulo I
En un de la Mancha, de cuyo nombre no quiero , que vivía un de los de lanza en astillero, adarga antigua, flaco y galgo corredor.
1
lugarplace
noun
Tap a highlighted word
How it works
Your next book is your next lesson
01
Open a book
Import your own EPUB or PDF, or pick a classic from the free built-in library.
02
Tap any word
See the translation, meaning and pronunciation in context — without leaving the page.
03
Remember it
Saved words come back at the right moment — after 1, 3, 7 and 21 days — through quick games.
Inside the app
A reader, a dictionary and a word trainer — in one app
Why readers choose Booklex
Everything you need to read in a foreign language
Spaced repetition
Words return at growing intervals until they move into long-term memory.
How spaced repetition worksFive ways to practice
Turn saved words into a two-minute daily game.
Your books + a free library
Open any EPUB or PDF, or start with classics and graded articles in the app.
Offline, 50+ languages
Read and translate on the plane, in the metro, anywhere.
Highlights, notes, widget
Mark passages in five colors, share word lists and learn a word right from your Home Screen.
Free reading
Graded articles for every level
New texts every week, from A1 to C2. Read them here — or in Booklex, where every word is one tap away from its translation.
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Happy Mistakes: The Accidental Inventions That Changed the World
In September 1928, a Scottish scientist came back to his laboratory in London after a summer holiday. His name was Alexander Fleming,…
FAQ
Questions, answered
How do I learn a language by reading books?
Pick a book slightly above your level and read it in the original. Whenever a word stops you, tap it: Booklex shows the translation in context, saves it to your list and later brings it back for short reviews. Reading gives you real context; repetition makes the words stick. Why learn words by reading →
Which languages can I read in?
You can read books in more than 50 languages and translate words into any of them. The most popular are Spanish, French, German, Italian, English, Polish and Ukrainian.
Can I read my own books?
Yes. Open any EPUB or PDF from Files, AirDrop or iCloud Drive. There is also a free library of classics and graded articles from A1 to C2.
Is Booklex free?
Booklex is free to download. Every day you get free Smart translations and a practice session. Premium removes the daily limits and unlocks every exercise type.
Does it work offline?
Yes. Downloaded books, your vocabulary and word translations work without an internet connection.
Is it like reading a book with parallel translation?
Even better: instead of a fixed parallel text, you translate exactly the words and phrases you need — and keep them in your personal dictionary for practice.
Start reading in a new language today
Free on iPhone and iPad. Your first book is a tap away.
