Booklern vs Readlang for reading books
Readlang translates a word or phrase you click on any web page and turns it into a flashcard; Booklern shows a whole book with a translation aligned under every sentence, with audio and pronunciation scoring. Choose Readlang to read articles across the web in a hundred languages, Booklern to read English books with support.
What each one is
Booklern is a bilingual book reader for learning English: 1,093 classics or your own EPUB, in English with a translation into Russian, Spanish, Brazilian Portuguese, Japanese, Chinese, Turkish or Arabic under every sentence, plus audio, a dictionary, vocabulary and pronunciation scoring, in the browser.
Readlang is a web app and a Chrome extension. The extension translates a word, or a phrase you drag across, in place on any web page; the web app is an e-reader for uploaded texts. Every translation becomes a flashcard reviewed with spaced repetition. It supports over a hundred languages.
Reading
On Readlang you read the original and click what you do not know; the translation appears inline, and phrases are capped at 6 words on the free plan and 12 on the paid one, with 10 phrase translations a day free. On Booklern the whole translation is on the page, under each sentence or beside it, and can be hidden; hovering a word highlights its phrase in the translation.
Readlang's real advantage is the web: any article, in place, without copying. Booklern has no extension and reads books, not pages.
Books and uploads
Readlang's home page offers articles in fiction, non-fiction and songs plus user uploads; its library page could not be checked from outside, so we do not know whether it holds full-length classics. Uploads are TXT or DRM-free EPUB, not PDF. Booklern's library is 1,093 classics with a level each, and uploads are EPUB up to 30 MB or pasted text, also without PDF.
Audio, vocabulary, speaking
Readlang's high-quality voices for words and phrases are a paid feature, and voices for whole texts sit on the top plan; pronunciation practice is not listed. Booklern reads every chapter aloud with the current sentence highlighted on all books, and scores a read-aloud passage word by word.
For vocabulary, Readlang is stronger: every translation is a flashcard, reviewed by an adaptive spaced repetition schedule, with practice and export per book on the paid plan. Booklern saves words with one tap and practises them through generated stories, without an interval queue.
Which to choose
Choose Readlang if you read the web in a foreign language, learn something other than English, or want flashcards to grow out of everything you click. Choose Booklern if you learn English and want to read whole books with the translation, the audio and the speaking practice in one place.
| Booklern | Readlang | |
|---|---|---|
| Built for | Learning English by reading real books | Reading any web page or text in 100+ languages |
| Library | 1,093 classics with an estimated level | Articles and user uploads; full-length classics not confirmed |
| Import | EPUB up to 30 MB, pasted text; no PDF | TXT, DRM-free EPUB, any web page via extension; no PDF |
| Translation | Under every sentence or side by side, or hidden | Word or phrase on click; 6 words free, 12 paid; 10 phrases a day free |
| Audio | Read-aloud per chapter, sentence highlighted | Voices for words and phrases paid; whole texts on the top plan |
| Vocabulary | One-tap save, practice with generated stories | Flashcards with adaptive spaced repetition |
| Pronunciation | Scored per word from a read-aloud passage | Not listed |
| Platform | Browser, installable | Browser and Chrome extension; no native apps |
| Free plan | First chapters without an account; free account with daily AI allowance | 10 phrase translations and 10 context explanations a day |
Booklern is our product. The other columns come from the products' own public pages on the date above.
