Athena Reader vs Koodo Reader
Updated 2026-11-05
Koodo Reader is a popular open-source reader for desktop, mobile and the web, with a long list of formats and export targets. Athena is built around asking questions about your own library and syncing it with no setup. Here is how they compare, and when Koodo is the better fit.
The short answer
- Choose Koodo Reader if you want open-source software, a native desktop app on Windows, macOS and Linux, comics, many export targets such as Notion and Obsidian, or sync through storage you already own — OneDrive, Google Drive, Dropbox, WebDAV and more.
- Choose Athena if you want sync that works the moment you sign in and is included in the free tier, and question answering across one item, a shelf or your whole library with a citation on every answer.
Side by side
| Athena Reader | Koodo Reader | |
|---|---|---|
| Licence | Proprietary | Open source (AGPL-3.0) |
| Platforms | iOS, Android, Windows, web browser | Windows, macOS, Linux, Android, iOS, web; Docker |
| Formats | EPUB, PDF; MOBI, AZW, AZW3, FB2, TXT, RTF, MD, DOC, DOCX, ODT, HTML converted to EPUB | EPUB, PDF, MOBI, AZW3, TXT, FB2, MD, DOCX, HTML, comics (CBR, CBZ, CBT, CB7) and more |
| Sync | Built-in account sync, automatic, included in the free tier | Through storage you choose (OneDrive, Google Drive, Dropbox, iCloud, WebDAV, SMB, S3 and others); listed as a Pro feature |
| 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; Pro AI voices with a daily quota; plugins for Azure, Amazon Polly, OpenAI, ElevenLabs and others with your own key |
| Ask AI about your books | One item, a shelf or the whole library; answers cite the passage; built in, uses credits | “Ask AI” on selected text and an AI chat window; official AI is a Pro feature with a daily quota; custom models with your own key. Whether it searches the whole book and cites sources is not documented |
| Translation and dictionary | AI translation of selected text; AI dictionary; offline local dictionaries | AI translation, AI dictionary and AI encyclopedia; full-text parallel translation; translation plugins |
| OCR for scanned PDFs | Yes | Yes; “OCR for PDF” is listed as a Pro feature |
| Notes export | Markdown, plain text | CSV, Markdown, HTML, TXT, PDF; sync to Notion, Obsidian, Readwise, Joplin and others |
| Pricing model | Free tier; Pro subscription and credit packs; no ads | Free; yearly Pro plan; the free tier is limited to 20 books on mobile |
Koodo Reader facts were checked on 5 November 2026 against its website, pricing page, changelog and GitHub repository (sources at the end). Where Koodo’s pricing page and changelog disagree, we followed the pricing page. Athena facts come from our user guide.
Where Koodo Reader is the better choice
Koodo is open source under AGPL-3.0 and runs natively on Windows, macOS and Linux as well as on phones, the web and Docker. It reads comics, exports notes to more formats, and pushes them straight into tools like Notion, Obsidian and Readwise. Its sync goes through storage you choose, so your files stay in your own drive. Its interface is translated into more languages than Athena’s 17.
Where Athena is the better choice
With Athena you do not configure anything to sync: sign in on a second device and your library, progress, notes and highlights are there, and that is part of the free tier. Question answering is built in and can span one item, a shelf or your entire library, with every answer pointing back to the passage it relied on. Words you look up can go into a vocabulary list with spaced-repetition review.
See Ask AI about your own books for how the AI part works and where its limits are.
Frequently asked questions
Is Koodo Reader free?
Koodo Reader has a free version and a yearly Pro plan. According to its pricing page, sync, official AI features and OCR for PDF are Pro features, and the free tier is limited to 20 books on mobile.
Does Koodo Reader have AI?
Yes. It offers AI translation, an AI dictionary, an AI encyclopedia and an “Ask AI” chat. The official AI service is a Pro feature with a daily quota; you can also connect your own model with an API key.
Is Athena Reader open source?
No. Athena is proprietary software. Koodo Reader is open source under AGPL-3.0.
Can I keep my books in my own cloud drive?
With Koodo Reader, yes: it syncs through storage you choose. Athena syncs through its own service and does not support WebDAV or third-party drives.