The best AI tools for studying foreign-language books in 2026

I tested seven AI reading tools on the same three books — a García Márquez novel in Spanish, a Camus essay in French, and a German intro linear-algebra textbook — over about six weeks. Below is what actually happened with each one. Full disclosure up front: I work on Translify, which is one of the seven. I've done my best to be useful about where the others win, because nothing kills a comparison post faster than obvious axe-grinding.

If you're in a hurry: Translify if you sit down to actually study a book; Readlang if you read Spanish news for fun and want word lookups; Immersive Translate if you live in your browser and translate across everything; DeepL Pro if you only need raw translation and you'll do the reading somewhere else. Skip Kindle Translate unless your books happen to live in the Kindle Store and your language pair is English ↔ Spanish or German → English.

That covers the decision for maybe 90% of readers. The longer version, with what each one actually felt like to use, is below.

Translify

Yes, I built it. So take the praise with whatever salt is appropriate. What I'll say is what it's actually for.

You upload a PDF or an EPUB. It rebuilds the book in your target language — keeping the original layout intact, which matters more than you'd think for textbooks and anything with footnotes. Then you can chat with the whole book (every answer cites the page), highlight a passage to get an AI explanation in your language, and generate quizzes from chapters you've actually read. The point of the thing is comprehension, not translation.

If you're reading Hegel for class or a Japanese business book you've been putting off for a year, that combination is hard to find elsewhere. If you mostly want to read web articles in Spanish and build vocabulary, you're overpaying. €11–27/mo, 14-day trial, 30-day money-back. Onward.

Readlang

Readlang is the tool I'd recommend to my sister, who's been learning Spanish casually for three years. She reads articles, she clicks on words she doesn't know, the flashcards build themselves, and she's slowly accumulating a real vocabulary without doing anything that feels like studying. It costs $5 a month. It's been refined for a decade. The r/languagelearning crowd reveres it for a reason.

The catch — and it's the reason it's not the only thing I use — is that Readlang reflows text. Books lose their layout. For a novel that doesn't matter; for a textbook with figures, equations, and footnotes, it's a dealbreaker. Readlang also doesn't do chat. You can look up words, you can't ask the book what an argument means. For its intended audience, that's a feature, not a bug. (Full comparison: Translify vs Readlang.)

Immersive Translate

Ten million users, and you can see why the moment you install it. It's a browser extension that translates basically everything — web pages, PDFs, EPUBs, YouTube subtitles, Zoom captions, manga panels, image text. You can swap between twenty-plus translation engines. The bilingual side-by-side display is genuinely nice.

Where it doesn't quite fit my workflow: it's a translation overlay, not a study tool. You can read a German EPUB bilingually, but you can't ask “what's the author's argument across these three chapters” — there's no whole-book chat, no highlight-and-ask, no quiz mode. I use it for browser stuff and YouTube videos. $9.99/mo or $70/yr. (Full comparison: Translify vs Immersive Translate.)

DeepL Pro

DeepL is the gold standard for European-language translation, full stop. If you need a German document translated to English and the quality has to be right the first time, it's hard to do better. Document Translator preserves formatting reasonably well, the API is excellent if you're building something, and the desktop app lives in my menu bar.

It's not really a reading tool, though. DeepL gives you a translated file. What you do with it from there is your problem. A lot of us use DeepL alongside something like Translify rather than instead of it — DeepL translates, Translify reads. Pricing starts at $8.74/mo and goes up from there based on how many docs you push through it. (Full comparison: Translify vs DeepL.)

Linga and Parallel Books

These belong together because they solve the same problem differently than everyone else on the list: they don't let you upload anything. Instead, you pick from a curated catalog of bilingual books — graded readers, public-domain classics, the kind of thing language teachers recommend.

For early-intermediate learners who want to read “a French novel” without sourcing one, this is perfect. For anyone who needs to read this specific book — a textbook, a paper, anything outside the catalog — it doesn't help. Both are free or freemium; Parallel Books charges per individual title.

MyReader

MyReader is a general document-AI tool that happens to do translation. You can upload books, papers, web links, YouTube videos and chat with them, get summaries, convert anything to audio in 50+ voices. The chat is solid. The audiobook generation is actually impressive.

It's worth knowing about, but if your primary task is “read a German textbook in English,” the translation features feel bolted on rather than built in. Better for varied input — papers, articles, videos — than for sustained book reading.

Amazon Kindle Translate

Launched November 2025, baked into the Kindle reading experience. If your book is in the Kindle Store and your language pair is English ↔ Spanish or German → English, this is the easiest path you'll find — translation is one tap, you stay in the device or app you already know.

Three limitations make this a no-go for most of us. The catalog is Amazon-only. The language coverage is narrow (no French, no Japanese, no Arabic, no anything except those three pairs). And there's no chat, no highlight-explain, no quizzes — it's a translation layer over the existing Kindle reading experience, not a study tool. Worth keeping an eye on as it expands. (Full comparison: Translify vs Kindle Translate.)

The boring side-by-side table, for completeness

One last thing

Most of the readers I know — including me — use two tools rather than one. Immersive Translate for the everyday browser stuff, Translify for the books I actually sit down with. That stack is about $20 a month and it covers every foreign-language reading situation I run into. If I had to pick one and only one, the question I'd ask is: do you read books, or do you read everything else? Most people read everything else. A meaningful minority sits down with books, and for those people the trade-offs flip.

Whatever you pick, the worst move is to keep using Google Translate on copy-pasted paragraphs. We're past that. Pick something built for the way you actually read, give it two weeks, and decide.

If “the way you actually read” sounds like the books case, try Translify free for 14 days. 30-day money-back, no questions.