Episteme: PDF & eBook Reader APK

Episteme: PDF & eBook Reader

The Comprehensive Document & E-book Reader

• Episteme Reader is a premier, privacy-centric application designed for users who prioritize total control over their digital libraries.

• Operating with an offline-first architecture, it provides a seamless reading experience across a vast array of formats, including PDF, EPUB, MOBI, AZW3, FB2, ODT, DOCX, comics, Markdown, and HTML.

Reading Experience and Customization

• Choose between paginated mode for a traditional layout or continuous vertical scrolling for efficient consumption.

• Import custom .ttf or .otf fonts to personalize your reading style, with full support for embedded and system fonts.

• Leverage professional PDF annotation tools, including various pen styles, highlighters, and text boxes, with the ability to export annotated files while maintaining vector fidelity.

Advanced Functionality

• Perform full-text searches across large documents with background indexing and utilize built-in OCR for scanned or image-based PDFs.

• Convert text to audio using local system engines or high-quality Cloud TTS powered by Gemini.

• Pro features include AI-driven summaries of complex material and context-aware dictionary lookups for instant vocabulary support.

Organization and Synchronization

• Effortlessly manage your library with custom shelves, sorting options, and direct folder synchronization trackers.

• Enable Pro Cloud Sync via Google Drive to keep your reading progress, bookmarks, and shelf organization synced securely across all your devices.

Privacy and Security

• Episteme is engineered for absolute privacy; all core features are functional without an account.

• The application operates locally by default, ensuring your content remains on your device.

• Any optional AI-powered features process data securely in volatile memory, strictly prohibiting the storage of your private content on external servers.

FAQ

Q: Does the application require an internet connection to work?

A: Episteme is built on an offline-first architecture, meaning you can access your entire library and utilize the majority of our reading tools without ever needing an active internet connection.

Q: What file formats does Episteme support?

A: You will find that Episteme is incredibly versatile, supporting a wide range of formats including PDF, EPUB, MOBI, AZW3, FB2, ODT, DOCX, comics, Markdown, and HTML files.

Q: Can I customize how I read my documents?

A: Yes, you have full control over your layout, as you can easily toggle between a traditional paginated mode for a classic book feel or a continuous vertical scrolling mode for faster, more efficient reading.

Version History

v1.0.52-oss——13 Jul 2026

Experience Episteme: the ultimate private PDF & eBook reader. Support for all formats, AI summaries, OCR, and cloud sync. Download the latest version of Episteme: PDF & eBook Reader to enjoy new features and updates immediately!

*1.0.52-oss

Here's what's new

Library improvements

• Optional, redesigned view of library with a more consistent and unified experience.

• Added options to sort books by newest or oldest.

• Fixed shelf syncing and improved general library sorting.

Reading improvements

• Markdown files are now split into chapters based on headings.

• EPUB sections linked from the table of contents are handled more reliably.

• Improved image sizing, wide-content handling, tables, and complex page layouts.

• Fixed touchpad scrolling.

Fixes

• Fixed reading position not being restored correctly in PDFs.

• Fixed text selection in paginated mode when using Arabic.

• Fixed some files not opening correctly from outside the app.

• Fixed keyboard spacing issues in the PDF reader.

• Improved TTS playback, stopping, navigation, and reliability.

• Fixed several crashes, freezes, and general stability issues.

*1.0.51-oss

Here's what's new

Reader and navigation

• Added search inside the Table of Contents

• Improved native vertical reader loading and prefetching

• Improved paginated reader restoration and page count caching

• Fixed text cutoff in pagination mode

• Pinned PDF top bar actions to the trailing side

Highlights and annotations

• Added more highlight styles like underline and strike through

• Added support for custom highlight colors in epub reader

• Fixed custom highlight colors persistence in PDF export

• Added support for exporting annotations as Markdown and plain text

Library and book management

• Added EPUB cover image editing

• Added support for deleting tags from the library

• Added bulk “Add to Shelf” in selection mode

• Improved selection mode UI in Home and Library screens

• Fixed recent books ordering so they stay sorted by recency

• Fixed custom book renaming and title resolution for PDF and comic files

• Pre-filled the rename bookmark dialog with the current title

Fixes

• Fixed crashes and ANRs

• Fixed premature TTS stream transitions

• Added retry handling for missing TTS chunks

*1.0.50-oss

Here is what is new in this update:

Major Changes

• Continuous Vertical Scrolling

The EPUB reader now features a continuous vertical scrolling variation. It runs on the same custom engine that handles pagination, allowing you to scroll seamlessly through an entire file without breaking pages.

reader screen > more > reading mode > vertical (native)

• Temporary External File Viewing

We added a "Temporary" option for external file behavior. When opening a file from an email or external file manager, it will open a standalone instance of the reader. This allows you to read the document without permanently adding it to your app storage.

home > more > external file behavior > temporary

• Visual Word Replacement

Added a new feature that allows you to visually replace specific words directly within the text of the books you are reading.

reader screen > more > book word replacement

Improvements & Additions

• CBT Support: Added full support for reading CBT files.

• Better Custom Fonts: You can now select multiple font files at once from the file picker when importing. The app also now detects and properly uses font file variations.

• Quick Share & Save: You can now easily share or save any file directly from the home screen or library by long-pressing the item.

• Fixes: Addressed several underlying bugs and crashes to improve overall stability.