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 v11 News

Announcements

Temporarily going back to Mantis bug tracker

I experimented with using GitLab issues for composr.app but decided to make a temporary revert to our old software (Mantis). Read for more information.

Announcements

Stepping down as Composr's lead developer

I (Patrick Schmalstig) will be stepping down as Lead Developer of Composr CMS as of April 1, 2025 (this is not an April Fool's Day joke). Please read more for important information.

Announcements

What happened to compo.sr?

Compo.sr is now read-only, and I am working hard to get composr.app to a state it can accept registrations. Please read more to see what happened and why.

Older news

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
12th Mar 2025, 10:42 PM Composr 11 beta7 released 2 comments
3rd Mar 2025, 11:06 PM Where is version 11 beta7? 0 comments
1st Jan 2025, 7:02 PM Happy New Year 2025! 0 comments

Get an Early Preview of Composr CMS v11

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


You can opt-in (or out) to have your v11 site 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 know what you are doing and are aware of the responsibilities and implications (especially security and stability).