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

The app is head and shoulders above its competitors, it's excellent. It's also worth mentioning the integration of AI features and the flexible interface customization... but there are a couple of downsides. First, the words aren't highlighted correctly, either the wrong part or a completely blank character. Some books don't have covers, and I wish I could add them myself.

It's great e-book reader but I have an issue with reading some books in pdf format. The problem is the fact of reading it from tiny phone screen which is uncomfortable, so (it's necessary to zoom in, but it should be done for every single page manually, instead of universal and one time functionality) It would be great if lock symbol would (lock the position of the page with current zoom and it could be possible to turn pages, effectively reading as usual). I hope you will pay attention!

please fix the tts , it jumps over some paragraphs and skips them at random. Edit: it still skips or jumps over some sentences during tts when using third party tts engines even after the latest update. I realized this happens because for some sentences the engine takes longer to generate than usual, i hope this could be fixed by giving the engine the time it needs without skipping onto the next successfully generated sentence. also we need sleep timer ⌛

What’s new

• New continuous vertical scrolling mode for EPUBs
• Added support for reading CBT files
• You can now select and import multiple fonts at once
• Better font handling with automatic variation detection
• Open files from other apps in a temporary mode without adding them to your app storage
• Long-press books in your library or home screen to quickly save or share them
• New visual word replacement to swap out specific words while reading
• Fixed various bugs and crashes