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Publishing · head to head

Calibre vs Evergreen ILS

Calibre logo

Calibre

Publishing

Ebook library management and format conversion

From
Free
Rated
-
Full reviewWebsite
Evergreen ILS logo

Evergreen ILS

Libraries

Highly scalable open source library software

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Calibre the interface is dense and widely described as unintuitive, with a great deal exposed at once; Evergreen ILS server installation is supported only on Debian 10, 11, 12 and 13 and Ubuntu 22.04 and 24.04
  • They diverge on capability: Calibre covers Format conversion, Evergreen ILS covers Circulation management.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Calibre and Evergreen ILS actually diverge.

Attributes where Calibre and Evergreen ILS differ
AttributeCalibreEvergreen ILS
Pricing modelOpen source, no licence feeopen-source
PlatformsWindows, macOS, LinuxWeb, Desktop, Api
CategoryPublishingLibraries
FoundedUnknown2006

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Calibre

  • Format conversion
  • Library management
  • Device sync
  • Content server

Only in Evergreen ILS

  • Circulation management
  • MARC cataloging
  • Acquisitions
  • Serials management
  • OPAC with faceted search
  • Patron management
  • Offline circulation
  • Consortia support

What people use each for

The jobs each tool is most often brought in to do.

Calibre

  • Converting books between formats for different e-readersnot Evergreen ILS
  • Managing a large ebook library with proper metadatanot Evergreen ILS
  • Authors preparing files for several storefrontsnot Evergreen ILS

Evergreen ILS

  • Running a consortium-scale library catalogue and circulation systemnot Calibre
  • Self-hosting an open source integrated library system across multiple branchesnot Calibre

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Calibre

  • The interface is dense and widely described as unintuitive, with a great deal exposed at once
  • Conversion between formats is imperfect, and complex layouts degrade
  • Cannot remove DRM, so purchased books from most stores will not convert without third-party plugins
  • Heavy for someone who only wants to read rather than manage a library

Evergreen ILS

  • Server installation is supported only on Debian 10, 11, 12 and 13 and Ubuntu 22.04 and 24.04
  • PostgreSQL 14 is the minimum supported version
  • OpenSRF 3.3.0 or later must be installed separately before Evergreen itself
  • Installation is a manual multi-service process requiring a dedicated PostgreSQL superuser account and shell access

Pricing, plan by plan

Calibre

Free
  • CalibreFree
    • Full functionality
    • Commercial use permitted
    • Community support

Evergreen ILS

Free
  • Self-HostedFree
    • Full ILS functionality
    • Circulation system
    • OPAC
  • Hosted (via partners)$200/month
    • Everything in Self-Hosted
    • Managed hosting
    • Professional support

Which should you pick?

Choose Calibre if

  • You need format conversion.
  • You want to start without paying.
  • You work on Windows, macOS, Linux.
  • You also want library management.
Calibre review

Choose Evergreen ILS if

  • You need circulation management.
  • You want to start without paying.
  • You work on Web, Desktop, Api.
  • You also want marc cataloging.
Evergreen ILS review

Questions people ask

Is Calibre or Evergreen ILS better?
Neither clearly leads. Calibre starts at Free and Evergreen ILS at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Calibre or Evergreen ILS?
Calibre starts at Free and Evergreen ILS at Free.
Does Calibre or Evergreen ILS run on more platforms?
Calibre runs on Windows, macOS, Linux. Evergreen ILS runs on Web, Desktop, Api.
Can I use Calibre for free?
Both have a free tier, so you can try either at no cost before committing.
What is Calibre best used for?
Calibre is most often used for converting books between formats for different e-readers, managing a large ebook library with proper metadata, authors preparing files for several storefronts. Of those, converting books between formats for different e-readers and managing a large ebook library with proper metadata are not what Evergreen ILS is typically brought in for.
What can Calibre do that Evergreen ILS cannot?
Calibre covers Format conversion, Library management, Device sync, Content server. Evergreen ILS covers Circulation management, MARC cataloging, Acquisitions, Serials management.

Answered from the vendors’ own pages

Calibre: Is Calibre free?

Yes, open source under the GPL.

Evergreen ILS: Is Evergreen ILS free?

Yes, Evergreen ILS is a free open source library management system. The software is available at no cost for libraries and organizations to install, deploy, and customize according to their needs.

Source
Calibre: Can Calibre convert DRM-protected books?

No. It does not remove DRM, so most store-purchased books cannot be converted with Calibre alone.

Evergreen ILS: Does Evergreen ILS offer commercial support or hosting?

Evergreen ILS website does not list commercial hosting or support services. As an open source project, it relies on community contributions and institutional deployments. Libraries may arrange custom support through integrators or consultants, but no official commercial offerings are detailed on the website.

Source
Calibre: Does it work with Kindle?

Yes, it transfers to Kindle and most other e-readers and converts to the formats they use.

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