A journeyman who has travelled this path, won't steer you one way or the other, but if you choose to stop and ask about an aspen, he will tell you about it, granted you don't ask about the treasure lurking in its branches, for that is only for your eyes to behold.
Read naturally, ask freely
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.
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 over 60 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.
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.
AI Chat — Single Book
Upload any book and make it AI-ready in minutes. Ask questions grounded in the text, with answers bounded by your reading progress, or limitless if you want the non-fiction mode.
Series
Group books into series, a book can be part of any number of series, and ask questions across series while you're reading, to gain insights into character development across a multi-part series, or to empower your non-fiction reading.
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.
Get early access updates
Follow development progress, new features, supported books, and early access invites.