Composr CMS:
Your Data, Your Privacy, Your Control

Do you need to build a website? Are you tired of being locked down by third-party website builders and software? Composr CMS gives you full control and full autonomy over your website and its data!

The Composr software is Free and Open Source, so anyone can download and use it. Build any website you want, from a simple informational site to a complex eCommerce platform and anything in-between.


What is Composr CMS?

Composr is a very flexible CMS with advanced social, interactive and dynamic functionality.

Hundreds of features and building blocks are available out of the box. You don't need to rely on sketchy and potentially unmaintained third-party addons any longer.

Composr is embraced by a wide variety of industries, from Fortune-100 companies, government agencies, small startups / hobby sites, and much more! We make all the best ideas available to everyone.

Create smarter web properties; accelerate time to market

  • Huge integrated feature-set
  • Supportive community
  • No licensing costs
  • Cloud-compatible
  • Mobile responsive
  • HTML5, CSS3, WCAG

Latest News

Announcements

Now back on GitHub

We are now mirroring our GitLab repository to GitHub. Read more for more information.

General

Composr.app New Features

Read more to see a video outlining some of the new features in composr.app compared to compo.sr.

New releases

Composr 10.0.51 released

10.0.51 released. Read the full article for more information, and upgrade information.

Older news

21st Mar 2025, 6:19 PM Temporarily going back to Mantis bug tracker 0 comments
17th Mar 2025, 3:23 PM Stepping down as Composr's lead developer 3 comments
16th Mar 2025, 8:26 PM What happened to compo.sr? 0 comments
14th Mar 2025, 5:53 PM 11 beta8 coming in a week or two 1 comment
13th Mar 2025, 12:00 PM Composr 11 beta7 released 1 comment

Get an Early Preview of Composr CMS v11

Check out these sites running Composr CMS v11 who opted in to be featured:


If you have a Composr CMS v11 site, you can opt-in (or out) to have it featured when installing (on step 2) or in your configuration in the Admin Zone > Setup > Configuration > Privacy / legal compliance options. See the site showcase for more information.

Remember, version 11 is still in beta. We do not recommend running it in production unless you are aware of the responsibilities and implications (e.g. you will probably have some bugs which could affect operations or even corrupt data, and v11 might have undetected security issues).