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Browse our collection of 6,000,000+ books using search, genres, or curated shelves. Tap any book to open its detail page, then tap "Read" to start reading. Your progress syncs automatically across all your devices — phone, tablet, desktop, and web.

Tap the search icon in the navigation bar to search by title, author, or genre. You can also browse by genre, explore curated shelves, or check out collections like Empire Builders and Classics Cafe. Lex has over 6 million books and 30,000+ audiobooks.

Yes. When you're signed in, your reading position, highlights, bookmarks, notes, and bookshelves all sync automatically across every device — iOS, Android, desktop app, and web browser.

Go to Settings and choose from four themes: Midnight (dark, default), Daylight (light), Parchment (warm sepia), and Dusk (soft grey). The theme applies everywhere — the app, the reader, and your bookshelves.

The Premium Catalogue is a growing collection of exclusive Lex editions — new English translations of classic works, beautifully typeset and proofread. These are books you won't find anywhere else, published by Lex and included free with your Premium subscription. Browse the catalogue at lex-books.com/premium-catalogue.

The catalogue focuses on works that deserve better English editions — classic texts where existing translations are outdated, clunky, or hard to find. Each Lex edition is a fresh translation with modern English, clean formatting, and full AI intelligence (X-Ray, chapter summaries, character maps). New titles are added regularly.

Yes. Lex's free library has over 6 million public domain books from sources like Project Gutenberg and the Internet Archive. Premium Catalogue books are original Lex publications — new translations and editions that we produce in-house. They're exclusive to Premium subscribers.

Tap the "+" button on your homepage and select "New bookshelf" to create one. You can also create a shelf on the fly when adding a book — tap the three-dot menu on any book, choose "Add to bookshelf," and tap "Create new bookshelf." Lex automatically creates three status shelves for you: Currently Reading, Want to Read, and Read. You can pin up to 3 shelves to the top of your library for quick access.

Create a bookshelf (your reading list), then add books to it from any book's detail page using the three-dot menu or the "Add to bookshelf" button. You can reorder books by dragging and dropping, or use the sort dropdown to sort by date added, title, or author. You can also ask Lex AI to research and create a reading list for you on any topic.

Yes. Open the bookshelf, tap the menu, and toggle it to public. You'll get a shareable link that anyone can open to see your shelf and the books on it. Other Lex users can save your public shelf to their own library.

Go to Settings and scroll to "Import your library." Lex supports imports from Goodreads (profile link or CSV export), Kindle (Amazon data export), Apple Books, Calibre (reads your metadata.db directly), and CSV files from StoryGraph, Literal, or LibraryThing. Your imported books are matched to Lex editions and organized into shelves automatically.

Tap the heart icon on any book's detail page. All your liked books are collected in a special "Liked Books" shelf accessible from your library's quick access grid.

Yes. Lex supports EPUB and PDF files. Tap the "+" button on the homepage and select "Upload book," or drag and drop files on the web. Lex will look up metadata (title, author, cover) automatically. Your uploads sync across all your devices.

Yes. When you upload a PDF, Lex can convert it into a reflowable EPUB so it reads like a real ebook with adjustable fonts and layout. You can choose between fast, balanced, and high-quality conversion modes. Conversion progress is shown in real time.

While reading, tap the gear icon in the top bar to open the settings panel. You can choose from 7 fonts (including Merriweather, Atkinson Hyperlegible, and Source Code Pro), 6 text sizes from XS to 2XL, three line spacing options (Compact, Normal, Loose), and left or justified alignment.

Lex offers five reading modes. Scroll: continuous scrolling (default on mobile). Pages: paginated reading (default on desktop). Blitz (Premium): speed reading at up to 750 words per minute, word-by-word or sentence-by-sentence. Bilingual (Premium): side-by-side translated text. Listen: synced audiobook playback with highlighted text. Switch modes from the gear icon in the reader.

Select any text while reading to see the highlight menu. Choose from five colors (yellow, red, purple, blue, green) and four styles (highlight, underline, strikethrough, box). Tap an existing highlight to add a note, change its color, or delete it. View all your highlights and notes in the reader sidebar under the Highlights tab, where you can filter by color, style, or tag.

Tap the bookmark icon in the reader toolbar to bookmark your current position. View all bookmarks in the reader sidebar under the Bookmarks tab — each shows the chapter name, your percentage through the book, and the date. Tap any bookmark to jump to that position.

Select a word and tap the dictionary icon (Aa) in the selection menu. You can also use Web Search from the same menu to look up the selected text online.

Yes. Select the text you want to share, then tap Share in the selection menu. Lex generates a styled quote card with several template options. You can share it directly to social media, messaging apps, or save the image.

If a book has an audiobook available, you'll see a "Listen" button on its detail page. Tap it to open the audio player with chapter navigation, playback speed control, and a seek bar. On mobile, playback continues in the background with lock screen controls.

Yes. Switch to Listen mode from the gear icon in the reader. The text scrolls automatically and highlights each word as it's spoken. You get a mini player at the bottom with play/pause and speed controls while following along in the book.

Lex AI is your personal reading companion. It can answer questions about the book you're reading, recommend new books based on your taste, research reading lists on any topic, and generate study materials. Access it from the sparkles icon in the header (for general questions and recommendations) or the AI icon in the reader toolbar (for questions about the book you're reading).

In the reader, Lex AI can answer questions about the book using the actual text — it cites specific passages you can tap to jump to in the book. It can also generate flashcards, quizzes, vocabulary lists, character maps, timelines, discussion questions, chapter summaries, and key quotes for any book.

Yes. Lex AI learns your reading taste from your library and reading history. Ask it for personalized recommendations, or get specific — "What books did Napoleon read?", "Books that influenced The Lord of the Rings", or "Build me a reading list on stoic philosophy." It researches across the web and matches results to Lex's catalog.

Yes. Ask Lex AI to create a shelf on any topic ("Create a shelf of the best books on medieval history"), build a structured reading plan, or research what books a historical figure read. It creates the shelf, populates it with books from the Lex catalog, and adds it to your library.

Yes. From any book's detail page, tap "Translate" and choose from 23 languages including Spanish, French, German, Portuguese, Italian, Russian, Chinese, Japanese, Korean, Arabic, Hindi, and more. Lex creates a new translated edition that you can read just like any other book. Translation progress is shown in real time.

Yes, on the iOS and Android apps. Tap the download icon on any book's detail page to save it for offline reading. Premium subscribers get up to 50 GB of offline storage. View and manage your downloads from the Downloads page in your library.

X-Ray gives you AI-generated intelligence about a book — chapter-by-chapter summaries, a character map with roles and descriptions, and a deep analysis of themes with supporting evidence. You'll find X-Ray on the book's detail page under the intelligence tabs. Editions and Quotes tabs are free; Chapters, Characters, Themes, Illustrations, and Lessons require Premium.

Lex Premium gives you access to the Premium Catalogue (exclusive Lex editions and new translations), Lex AI (your reading companion), Blitz mode (speed reading), Bilingual mode (side-by-side translations), book translation into 23 languages, PDF to EPUB conversion, offline downloads, X-Ray intelligence, higher upload limits (50 GB), and a verified profile badge.

Premium is $9.99/month or $95.88/year (equivalent to $7.99/month). Both plans include a 7-day free trial.

Go to Settings in the app and tap on the subscription options. On iOS, payments are processed through the App Store. On Android, payments go through Google Play. On the web, you can subscribe directly with a credit card via our secure payment processor.

On iOS, go to Settings > [Your Name] > Subscriptions on your device, find Lex, and tap Cancel Subscription. On Android, open Google Play Store > Menu > Subscriptions > Lex > Cancel. On the web, go to Settings and click "Manage Billing" to cancel through our payment portal. You'll continue to have access until the end of your billing period.

If you've previously subscribed and need to restore your purchase (for example, after reinstalling the app or on a new device), go to Settings and tap "Restore previous purchases."

Yes. Go to Settings and find your personal referral link under "Invite Friends." When 3 people sign up using your link, you earn 1 free month of Premium.

Go to Settings, scroll to "Account management options," and tap Delete Account. This permanently removes all your data including reading progress, highlights, bookshelves, and uploads.