WordFlow - Vocab Builder

Moonslide Inc.

In-app purchases

About this app

Learn English vocabulary faster—made for the books you love to read.

WordFlow is a smarter way to build English vocabulary—designed for readers. Whether you're a native speaker or learning English (ESL/EFL), WordFlow helps you master new words naturally through your favorite books: fiction, classics, fantasy, nonfiction, and more.

No more getting stuck on difficult words! WordFlow predicts the vocabulary you’ll need for each book and helps you learn it ahead of time—so you can read fluently, improve comprehension, and enjoy the story.

Perfect for:
✅ English learners (ESL, EFL, TOEFL prep)
✅ Native English speakers building advanced vocabulary
✅ Students and book lovers of all kinds

Features:
📚 Vocabulary guides for thousands of popular books
🔍 Personalized English word lists based on your books
⚡️ Quick, fun English quizzes and flashcards
🔁 Spaced repetition learning system (SRS)
📈 Track your progress and daily learning streaks

Whether you want to learn English faster, improve your vocabulary, or just enjoy books without interruptions—WordFlow helps you unlock the joy of reading.

Ratings and reviews

the best thing so far but it isn't working. this app has promise but its lacking in updates and I can't subscribe to it

I've tried every vocab app out there, but WordFlow really cracked the code. Knowing the words before you encounter them in your actual books makes learning feel purposeful. It also makes reading smoother and more enjoyable.

I updated this game & now it wont work! 😥 So disappointed cause I really loved this game, it helped learn more vocabulary m, I hope it's fixed soon.Please fix this word game!! 🫣🙅‍♀️

What’s new

Behind-the-scenes improvements to reliability and error handling, so we can catch and fix issues faster.