Build Professional websites. Smart and budget friendly using Open Source.

Why Composite C1?

Hi! Marketeers

Ola Website Builders

Hello! Agencies

Focus on your content

Maintain your company websites without IT involvement
Make your website stand out with the SEO assistant
Easy multiplatform publishing - mobile and tablets
Fully supported and users in 160 countries

Read more about Composite for marketeers

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Begin your journey to a new website here

New to Composite C1?

See our getting started videos

"More than 1000 installs every month"

Browse your site and start editing

US agency of the year joins us

The San Francisco and New York-based web agency Questus have joined us as a registered partner.

View all

Web Designers & Developers rule!

Get a head start with starter sites, packages, documentation and samples
Enjoy superb html, css, xslt and script control, open to your favorite tools
Use ASP.NET Razor, Web Forms, Web API and MVC
A super developer friendly and LINQ based data layer included

Read more Composite C1 for Web Designers and Developers.

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Composite C1 Free Open Source CMS

New to Composite C1?

Read our Getting Started guide

Watch our videos for inspiration

What made Eric Porter go Wow?

»Wow, another Open Source CMS adds support for aspnet razor in a really cool way!« Eric Porter, ASP.NET Team PM

Composite C1 let you combine ASP.NET Razor, end-user UI and data in a seamless way.

Get a head start on your next design with the cool Twitter Bootstrap templates. The templates are easy to install and use, just use this simple guide our developers put together for you.

Budget friendly open source with all the professional trimmings
Empower all the Web Designers and .NET Developers in your organization
A management UI your customers will buy into
A flexible platform that integrate, perform and scale - also on Windows Azure

Read more about why Composite C1 is great for agencies

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Begin working smarter today!

Work smarter and faster

»The many packages and starter sites makes it possible for us to design, build and deliver great looking websites faster than ever before«.

Björn Wikström, CTO, Welcom
Welcom has among other built site and shop for Team Sportia one of the leading players on the Swedish market, with 126 sport stores.

30000 installations in 160 countries

From Australia to USA. With more than 30000 installs and counting Composite C1 is spanning the globe. We now have websites in more than 160 countries. And we are only just getting started.

"A fantastic app/CMS. It has great layering so you don't need to be an expert to start... and then as you build your knowledge can switch to more complex developer's languages like C#. Combine this with MVC, Razor and you have a cutting-edge ready to use platform that is simply a joy to work with." bluemeansgo

"Tried out a few of the CMS applications here, and this seems to kill the rest of them by far! I am working my way through getting C1 Certified! " Altissimo

"It's very strong, nice code, and easy to customize and extend and very fast." likeno_another