A commonplace book for the modern reader
Every book you read becomes knowledge you keep.
Track vocabulary, save passages, and master your reading with spaced repetition and AI. Turn fleeting encounters with words into lasting understanding.
How it works
Three steps to a sharper mind.
Read
Open any book. When a word or passage strikes you, save it.
Capture
Add words with definitions, quotes with context. AI fills in the rest.
Master
Spaced repetition, games, and flashcards turn captures into lasting knowledge.
Features
Tools that respect the reader.
Not another flashcard app. A complete reading companion that grows with you.
- 01
Word Vault
Every word becomes a permanent entry in your personal dictionary — definitions, pronunciation, etymology, mastery tracking.
- 02
Quotes & Passages
Save the lines that move you. Organize them into collections, rediscover them daily.
- 03
Spaced Repetition
A review queue that resurfaces each word exactly when you are about to forget it.
- 04
The Daily Puzzles
Crossword, scramble, word search, match, and flashcards — built nightly from your own vocabulary.
- 05
AI Assistant
Ask about any word or passage. Extraction, quizzes, summaries, and reading-level analysis with your own key.
- 06
Reading Clubs
Share discoveries, discuss books, and grow your vocabulary with fellow readers.
Built for momentum
Reading is better when growth is visible.
BookBrain turns the invisible work of reading into measurable progress. Streaks keep you consistent. XP makes mastery tangible. Achievements celebrate the milestones others never see.
- Spaced repetition that adapts to your pace
- Daily streaks that forgive one missed day a week
- An activity calendar of every day you showed up
- XP and levels that reward consistent learning
12
Level
248
Words
96
Mastered
Your next book is waiting.
Start capturing words and quotes today. Free, private, and built to grow with you.