Choose KOReader if you want
E-ink devices and many document formats.
Open-source reader for many formats that runs on Kindle, Kobo, PocketBook, Android and desktop Linux. It reads files you already have, but it does not sell books, so it suits readers who manage their own files.
Choose Readest if you want
Open-source reading across phones and desktops.
Open-source EPUB and PDF reader with apps on macOS, Windows, Linux, Android, iOS and the web, plus highlights, notes and text-to-speech. Kindle and Apple Books have longer track records.
The main differences
- Only Readest runs on Windows.
- Only Readest runs on macOS.
- Only Readest runs on iOS.
- Only Readest runs on Web.
Side by side
 KOReader |  Readest | |
|---|---|---|
| Score | 85.0 | 86.5 |
| Rank in list | #4 of 6 | #3 of 6 |
| Price | Free and open sourceFree and open source under AGPL-3.0 | Free and open sourceFree and open source under AGPL-3.0 |
| Free to use | Yes | Yes |
| Open source | Yes | Yes |
| Platforms | AndroidLinuxAndroid, Linux | macOSWindowsLinuxAndroidiOSWebmacOS, Windows, Linux, Android, iOS, Web |
| Made by | Not stated | Not stated |
| Phone app | Yes | Yes |
| Best for | E-ink devices and many document formats | Open-source reading across phones and desktops |
| Strengths |
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| Limits |
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| Links | Visit site | Visit site |
Questions about KOReader vs Readest
- Is Readest better than KOReader?
- Readest ranks higher in our list of ebook reader apps (#3 against #4, score 86.5 against 85.0), but the gap is small and the better choice depends on what you need. KOReader is best for: e-ink devices and many document formats. Readest is best for: open-source reading across phones and desktops.
- Which is cheaper, KOReader or Readest?
- KOReader: Free and open source under AGPL-3.0. Readest: Free and open source under AGPL-3.0.
- Do KOReader and Readest run on the same platforms?
- KOReader supports Android, Linux. Readest supports macOS, Windows, Linux, Android, iOS, Web.