What is Merrilin?
Merrilin is an AI-powered e-reader for EPUBs and PDFs. It includes a context-aware AI chat that can answer questions about what you’re reading, stay spoiler-safe for fiction, and connect ideas across books in your library.
Merrilin
Read Anywhere, Ask Anything
A reading app with an AI companion that adapts to what you're reading, protecting fiction from spoilers while answering non-fiction with full context.
Get it onGoogle Play
Coming soon onApp Store
Reading is the point. Everything else follows.
Merrilin is a reading app first. The AI companion, the analytics, the sync — they all exist to help you read more and read better.
Built-in reader
Read EPUB and PDF files directly in your browser with 71 themes to choose from. Highlights, bookmarks, and AI chat live right beside the text.
Reading analytics
Not "110 hours to finish" — instead, "30 days at 30 minutes a day", tailored to your actual reading velocity. See when you read most, how your sessions trend, and build a sustainable habit.
Bring your own books
Upload your EPUBs and PDFs. Merrilin is a platform, not a store — your library, your files, your reading experience.
AI that respects how you read
Toggle between fiction and non-fiction modes. Fiction keeps spoilers gated to your reading position. Non-fiction goes all in. Either way, every answer cites specific passages.
Series & cross-book Q&A
Think playlists, but for books. Group any combination — a trilogy, a reading list, books that share nothing but your curiosity. Then ask questions across all of them at once.
Every platform, one library
Available on Android, iOS, and the web — and optimized for e-paper devices running Android. Start on your Boox, continue on your phone. Everything syncs.
Frequently asked questions
Is Merrilin spoiler-safe?
Yes. For fiction, Merrilin can limit answers to your current reading position so you can ask questions without revealing later plot points.
What book formats does Merrilin support?
Merrilin supports EPUB and PDF books.
Does Merrilin support technical books?
Yes. Merrilin is designed with technical books in mind, including careful support for code snippets, inline code, and tabular data in EPUBs and PDFs.
Can Merrilin answer questions across multiple books?
Yes. You can ask questions across a series, reading list, or other groups of books in your library.
Can I use Merrilin on mobile?
Yes. Merrilin works on the web and can be installed as a PWA. Users can opt in to Android testing now, and native iOS support is in progress.
Is Merrilin a bookstore?
No. Merrilin is for reading your own EPUB and PDF files; it is not a bookstore.
How does Merrilin use AI?
Merrilin uses AI to answer questions grounded in your books, cite relevant passages, and adapt responses based on whether you are reading fiction or non-fiction.
See it in action
Screenshots and walkthroughs from the latest build.
Library
View your collection in the form of books rendered on a shelf, thumbnails or a simple list.
Reader
Enjoy native experience across a series of platforms, android, ios, web and even epaper displays.
Technical & Coding Books
Programming books deserve a real code experience. Merrilin detects code blocks in EPUBs and PDFs, adds syntax highlighting with line numbers, and gives you one-tap copy and a full-screen view.
Reading Analytics
Your statistics stay out of your way, but here's a peek under the hood. Merrilin uses time-tested statistical process control methods to tell you, with confidence grounded in your past reading, that you can finish War and Peace in 30 days at 30 minutes a day.
Start reading with Merrilin
Create an account to join the preview, or sign in if you already have one.
