ClickBook is an offline ereader for EPUBs and readable PDFs that turns every book into a language-learning companion. Tap any word while you read and get an instant, context-aware explanation powered by on-device AI.

★ TAP ANY WORD
One tap shows what a word means in the exact sentence you’re reading. The AI understands context, so you get the right meaning without digging through unrelated dictionary entries.

★ EPUB AND PDF SUPPORT
Import EPUB files and readable PDFs from your device. ClickBook prepares PDFs for its reader so you can tap words, read comfortably, and keep your place. Complex layouts or scanned image-only PDFs may not convert perfectly.

★ OFFLINE AFTER SETUP, PRIVATE BY DESIGN
After the AI model downloads, word explanations run on your phone. Your books, reading progress, and lookups stay on your device during normal use. No account, no ads, no cloud AI processing.

★ BUILT FOR LANGUAGE LEARNERS
Reading in another language is one of the best ways to build vocabulary, but only if looking up words does not interrupt your flow. ClickBook makes that friction disappear. Tap, understand, keep reading.

★ INCLUDED CLASSICS
ClickBook includes hand-picked public-domain classics to get you started: Pride and Prejudice, Little Women, and Alice’s Adventures in Wonderland.

★ OPTIONAL PRO UPGRADE
ClickBook includes core offline reading and tap-to-explain features. ClickBook Pro is an optional one-time upgrade that unlocks extra AI tools, including deeper explanations and customizable AI answer order. No subscriptions.

★ DESIGNED FOR READING
Adjust font size, reading style, and themes including light, sepia, mint, and dark. ClickBook keeps the interface clean and remembers your reading position so you can always pick up where you left off.

★ WHO IT’S FOR
• Language learners reading in a second language
• Curious readers who want to understand every word without losing the thread
• Readers importing EPUBs or readable PDFs
• Anyone tackling classic literature with unfamiliar vocabulary
• Readers who value privacy and offline-first tools

Requirements: EPUB files or readable PDF files, enough storage for the on-device AI model, and an internet connection for initial model download and optional Pro purchase or restore.

ClickBook — tap to understand.