Athena Reader vs Readest
Updated 2026-11-05
Both open EPUB and PDF on phones, computers and the web, and both sync your progress and notes. They are built around different things: Readest is an open-source reader with deep customisation and e-ink support; Athena is built around asking questions about your own library, with sync that needs no setup.
The short answer
- Choose Readest if open-source software matters to you, you read on an e-ink device, you read comics (CBZ), you want a native app on macOS or Linux, or you want your files to live in storage you control — WebDAV, Google Drive, OneDrive, iCloud Drive or S3 (on Readest that option needs a paid plan or a one-time unlock).
- Choose Athena if you want to ask questions across a shelf or your whole library and get answers that cite the page, need text recognition for scanned PDFs, or want sync that works the moment you sign in, included in the free tier.
Side by side
| Athena Reader | Readest | |
|---|---|---|
| Licence | Proprietary | Open source (AGPL-3.0) |
| Platforms | iOS, Android, Windows, web browser | iOS, Android, Windows, macOS, Linux, web |
| Opens directly | EPUB, PDF | EPUB, PDF, MOBI, AZW3, FB2, CBZ, TXT, HTML, Markdown |
| Converted on import | MOBI, AZW, AZW3, FB2, TXT, RTF, MD, DOC, DOCX, ODT, HTML → EPUB | DOCX and RTF through “Send to Readest” |
| Comics (CBZ) | Not supported | Supported |
| Sync | Built-in account sync, automatic, included in the free tier | Readest Cloud (free tier has a storage limit); your own WebDAV, Google Drive, OneDrive, iCloud Drive or S3 with a paid plan or one-time unlock; self-hostable |
| Read-aloud | Device speech engine by default (free, offline); sentence highlighting in EPUB; optional cloud voices with your own Azure or Volcano Engine key | System voices on mobile, Edge TTS online, paid Readest Voice, or a custom OpenAI-compatible service; word or sentence highlighting |
| Ask AI about your books | One item, a shelf or the whole library; answers cite the passage; built in, uses credits | An AI reading assistant exists in the source code — one book at a time, off by default, needs your own model or API key — but is not described in the official docs |
| Translation | AI translation of selected text | DeepL, Azure, Google or Yandex; whole-book parallel translation |
| OCR for scanned PDFs | Yes | Not found in the official docs |
| Notes export | Markdown, plain text | Markdown, plain text, JSON; Readwise, Hardcover and Notion integrations |
| E-ink mode | No dedicated mode | Yes |
| Pricing model | Free tier; Pro subscription and credit packs; no ads | Free tier; Plus and Pro subscriptions; one-time purchases |
Readest facts were checked on 5 November 2026 against its website, documentation, pricing page and GitHub repository (sources at the end). Athena facts come from our user guide. Prices are not compared because both apps vary them by plan and region — see each pricing page.
Where Readest is the better choice
Readest is free and open source under AGPL-3.0, so you can read its code, build it yourself and self-host its sync. It has native apps on every major desktop system including Linux, a dedicated e-ink mode, comic support, and an interface translated into more languages than Athena’s 17. If you want your books to sit in your own WebDAV or cloud drive rather than in a vendor’s cloud, Readest offers that (as a paid option); Athena does not.
Where Athena is the better choice
Athena is built for studying what you read. You can ask a question across one book, a shelf or your whole library, and every answer cites the passage it used so you can check it. Scanned PDFs can be run through text recognition so they become searchable and askable. Sync of your library, progress, notes and highlights is part of the free tier and needs no configuration. Words you look up can go into a vocabulary list that schedules reviews with spaced repetition.
See Ask AI about your own books for how the AI part works and where its limits are.
Frequently asked questions
Is Athena Reader open source like Readest?
No. Athena is proprietary software. Readest is open source under AGPL-3.0.
Can Readest answer questions about my books?
Readest’s source code contains an AI reading assistant that works on one book at a time, is off by default and needs your own model or API key. As of November 2026 it is not described in Readest’s official documentation. Athena’s question answering is built in and can cover one item, a shelf or the whole library, with citations.
Which one works on an e-ink reader?
Readest has a dedicated e-ink mode. Athena has no e-ink mode.
Do I need to set up my own cloud storage to sync?
Not with either. Athena syncs through your account automatically, including on the free tier. Readest syncs through Readest Cloud; using your own WebDAV or cloud drive instead requires a paid plan or a one-time unlock.