Episteme: PDF & eBook Reader

Episteme Dev

In-app purchases

About this app

Episteme Reader is an offline-first, privacy-focused document and e-book reader. It supports PDF, EPUB, MOBI, AZW3, FB2, ODT/FODT, DOCX, Comics, Markdown, HTML, and plain text files.

📖 Two Reading Modes
Switch between a paginated view for a traditional book-like experience and continuous vertical scrolling for quick reading. Both modes work across all supported formats.

✏️ PDF Annotations
Draw directly on PDF pages using pen, fountain pen, pencil, highlighter, and eraser tools. Add text boxes anywhere on a page with system or imported fonts. Annotated documents can be exported with full vector fidelity.

🔤 Custom Fonts
Import your own font files (.ttf, .otf) and use them while reading any ebook format. Embedded book fonts and system fonts are also fully supported.

🔍 Text Selection & Search
Select, copy, and search text across all formats. Full-text search with background indexing for large documents. built-in OCR support for scanned or image-based PDFs.

🎧 Text-to-Speech
Listen to any document using your device's TTS engine or use Cloud TTS powered by Gemini for realistic voices.

🧠 Smart Tools (Pro)
Get context-aware dictionary definitions for words and phrases. Generate concise summaries of chapters or pages to quickly understand complex material.

📚 Library & Organization
Manage your collection with custom shelves and collections. Sort by title, author, or reading progress. Jump back into recent books instantly.

📂 Local Folder Sync
Point Episteme at a folder on your device to automatically import and track books.

☁️ Cloud Sync (Pro)
Sign in with Google Drive to sync your library, reading progress, bookmarks, and shelves across multiple devices. Files are stored securely in your private Google Drive app storage.

🔒 Privacy
Episteme is designed to work entirely offline. No account is needed for any core feature. AI-powered\online features process data securely in memory without storing any user content.

Ratings and reviews

can modify real file metadata, not only in-app properties of a book! 😘 p.s.: please add a filter by series or the ability to edit file metadata tags (not only in-app tags). Just want to store my library properly, without being locked into one app (for example, I also check series and tags in moon+ reader). Of course, I use calibre for that, but sometimes you need a quick addition of a category (for filter purposes later) through a tag or series right here on android. thanks!

The absolute best app!!! I spent days looking for an app that let's me read pdfs without any extra fuss, but still with at least minimal editing option like highlighting. And this is it! It's simple looking, simple to use, works well, no pop-ups in your face, no extra bulk with features that I wouldn't ever want to use anyway, perfect for reading and highlighting which I think are the two essential things a mobile reader app needs to do.

I am currently using the Text-to-Speech (TTS) feature to listen to e-books on my Pixel 6 phone. However, I have encountered a rather frustrating bug with the TTS feature: it does not automatically pause when I receive an incoming phone call. Because of this, the audio keeps playing in the background during calls. TTS also has a bug with play/pause gesture of my Bluetooth headset. It does not pause but start to play next paragraph when I use pause gesture.

What’s new

- LaTeX math support in markdown files
- Text formatting toolbar in PDF reader is now drag-able
- PDF themes now apply to page thumbnails
- Smoother PDF rendering while scrolling and zooming
- Crisper text selection handles in PDF reader
- Fixed ANRs, OOMs, and crashes