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Comparison · Ebook reader apps

calibre vs Readest: which is better in 2026?

calibre83.0#6 in best ebook reader appsReadest86.5#3 in best ebook reader apps

Readest ranks higher in our list of ebook reader apps (#3 against #6, score 86.5 against 83.0).

How we rank Share

  • 83.0
    Editorial score
    86.5
  • 3
    Platforms
    6
  • Yes
    Free to use
    Yes
  • Yes
    Open source
    Yes

Which should you choose?

Choose calibre if you want

Managing and converting a large personal library.

Free and open source library manager that converts books between formats on Windows, macOS and Linux. It is a desktop tool with no phone reading app, so it complements a reader rather than replacing one.

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 iOS.
  • Only Readest runs on Android.
  • Only Readest runs on Web.

Side by side

calibreReadest
Score83.086.5
Rank in list#6 of 10#3 of 10
PriceFree and open sourceFree and open source under GPL-3.0Free and open sourceFree and open source under AGPL-3.0
Free to useYesYes
Open sourceYesYes
PlatformsWindowsmacOSLinuxWindows, macOS, LinuxmacOSWindowsLinuxAndroidiOSWebmacOS, Windows, Linux, Android, iOS, Web
Made byNot statedNot stated
Phone appNoYes
Best forManaging and converting a large personal libraryOpen-source reading across phones and desktops
Strengths
  • Free and open source under GPL-3.0
  • Manages a personal library on the desktop
  • Converts books between formats
  • Free and open source under AGPL-3.0
  • Apps for desktop, phone and the web
  • Highlights, notes and cloud sync
Limits
  • No phone app, so reading on a phone needs another tool
  • Desktop tool rather than a reading app
  • Less established than Kindle or Apple Books
  • Cloud sync is listed on the homepage without pricing detail
LinksVisit site Visit site

Questions about calibre vs Readest

Is Readest better than calibre?
Readest ranks higher in our list of ebook reader apps (#3 against #6, score 86.5 against 83.0). calibre is best for: managing and converting a large personal library. Readest is best for: open-source reading across phones and desktops.
Which is cheaper, calibre or Readest?
calibre: Free and open source under GPL-3.0. Readest: Free and open source under AGPL-3.0.
Do calibre and Readest run on the same platforms?
calibre supports Windows, macOS, Linux. Readest supports macOS, Windows, Linux, Android, iOS, Web.

Choosing between the two

Learning Center
1:17Beginner · 4 min readHow to decide between two good optionsSettle a close call by sorting it by how hard it is to undo, setting a deadline, scoring the criteria as a tie-breaker and writing down why you chose.1:20Beginner · 6 min readHow to compare products fairly: what to keep in mindDefine the job, cap the must-haves, compare like with like, count total cost over one period and weigh the criteria. Includes a worked example.

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