An AI Tutor for the books you actually want to read.
Bring your own EPUB. When a word, sentence, or tone becomes difficult,
AI Tutor explains the exact passage in context. Turn what you choose into
learning cards, spaced review, writing, and speaking—so every book expands
what you can read next.
Free and open-source Early Preview · Sign in with a ChatGPT account that has
Codex access; no separate API key for AI Tutor · macOS and Windows
AI Tutor answers from the reading context you select—without leaving the book
or repeatedly copying and pasting.
Stop piecing together a reader, chatbot, and flashcard app.
VocabReader keeps the original text, AI Tutor, learning cards, and spaced
practice in one reading flow. Understand what blocks you now, then keep what
is worth learning for later.
AI Tutor understands the passage—not just the word.
Select the reading context you want help with, then ask about a word,
sentence, structure, or tone. AI Tutor explains how the language works here,
so you can understand the passage and keep reading.
Turn unfamiliar language into something you can understand
Ask AI Tutor about unfamiliar words, phrases, sentence structure, or grammar.
It uses the surrounding context to help you understand how the passage works,
so challenging language becomes part of a book you can keep reading.
Ask beside the book without repeatedly copying and pasting the source text.
Keep asking about meaning, grammar, or tone until the passage truly makes sense.
Use your ChatGPT sign-in for AI Tutor—no separate API key
Sign in to Codex with a ChatGPT account that has Codex access, and VocabReader reuses that local sign-in for AI Tutor—no extra API key to create or configure.
IMPORTANTA ChatGPT subscription that includes Codex access is required to use AI Tutor.
Use AI to turn reading discoveries into learning cards
AI turns the words and phrases you have just understood into review-ready
learning cards, preserving how they were used in the book so one moment of
understanding can grow into long-term memory.
Skip manual copying and card setup, and spend your time understanding and reviewing.
Each card keeps the meaning and example that help you recall how the word was used.
Remember longer with AI examples and spaced repetition
AI creates a fresh example sentence from each learning card, so you recall
the meaning in a new context every time. Spaced repetition brings it back at
the right time, gradually turning new vocabulary into long-term memory.
Learn English, Japanese, Korean, and Traditional Chinese.
Use the same AI-assisted reading, learning-card, and spaced-review flow for every supported language you want to learn.
Read one book. Grow into the next.
A reading-first loop: try it yourself, make unfamiliar language
comprehensible, save what matters, then review and use it over time.
1
Read a book worth growing into
Import your own EPUB and follow the meaning at your pace. Mark what gets in the way without stopping for every unfamiliar word.
2
Make the difficult parts comprehensible
After reading, ask AI to explain the vocabulary, sentence structure, grammar, and tone in context until the passage becomes clear.
3
Keep the words and phrases worth learning
Let AI prepare the useful details, then save the words and phrases worth learning with their precise meaning and examples.
4
Review, practise, and expand what you can read next
Use spaced repetition to strengthen memory, then practise writing, retelling, and speaking until recognition becomes usable language.
Practice that grows out of what you read.
VocabReader keeps comprehension, long-term memory, writing, and speaking as
distinct practices—while letting them share the same learning material.
Move from recognition to expression
Use several saved items in one passage, or listen and repeat natural chunks.
Writing and speaking activity stay separate from your spaced-review schedule.
For readers with a foundation—and books they want to grow into.
You can already follow the main idea, but unfamiliar words and structures
still interrupt you. VocabReader supports deliberate reading—not automatic
translation or passive vocabulary collection.
You want to learn from novels, nonfiction, or specialist EPUB books you chose yourself.
You want difficult language explained in the exact context where it appears.
You want spaced repetition to bring useful vocabulary back after the book has moved on.
You want every book to expand what you can read next, then carry that vocabulary into writing and speaking.
Bring the book you want to grow into.
Download VocabReader for macOS or Windows. AI Tutor uses your ChatGPT sign-in
through Codex when your account has Codex access—no separate API key. The
install guide walks you through setup.
