Folius: Books & Languages

Kassus Recordings LLC

In-app purchases

About this app

Turn every book into language practice.

Folius is an ebook reader built for language learners. Read real books without constantly leaving the page: tap a word for an instant translation, understand phrases in context, save useful vocabulary, and practice it later until it becomes part of your own speech.

Read without breaking your flow
• Tap any word for an instant translation
• Translate phrases and full sentences
• Listen to words and text with text-to-speech
• Copy text whenever you need it

Turn new words into active vocabulary
• Save words and expressions while you read
• Review them in the context where you found them
• Practice with simple vocabulary exercises
• Explore useful grammar and phrasal verbs from the text

Go deeper with AI
• Understand meaning, nuance, and context
• Get grammar explanations based on what you are reading
• Practice using new vocabulary in your own sentences
• Build confidence with AI-powered language practice

Made for real books
• Read EPUB, FB2, PDF, and TXT files
• Keep your reading progress
• Add bookmarks and search inside books
• Choose the reading style that feels comfortable for you

Folius is for learners who want more than a dictionary. Instead of stopping at “What does this word mean?”, it helps you move toward “How can I use this myself?”

Read more. Understand more. Use more of the language you learn.