# C1 CMS

Content management system built on the Microsoft .NET stack, distributed as open source.


Source: https://findsoftware.frbit.cloud/c1-cms/
Last reviewed: 2026-10-24
Listed since: 2026-10-24

## Record

### Links

- home: https://c1.orckestra.com/
- repository: https://github.com/Orckestra/C1-CMS-Foundation
- docs: https://docs.c1.orckestra.com/Getting-started/Guide
- plugins: https://c1.orckestra.com/Add-ons
- x: https://twitter.com/C1_CMS
- forum: https://gitter.im/Orckestra/C1-CMS

### Identity

- status: active
- maintainer: Orckestra A/S
- maintainerType: company
- parent: unknown
- firstRelease: 2015
- hqCountry: unknown

### Kind

- category: cms
- hosting: dotnet
- language: csharp
- runtime: dotnet
- runtimeMin: dotnet 4.7
- basedOn: unknown

### Content

- contentStore: flat-file, database
- databases: sqlserver
- adminUi: yes
- headlessApi: unknown
- templating: razor, xslt
- i18n: unknown

### Rendering and deploy

- runsAs: unknown
- renderingModes: unknown
- installMethod: Web Platform Installer, run in WebMatrix

### License

- licenseModel: open-core
- license: Mozilla Public License 1.1, MPL 1.1 with Section 11 amended to put disputes under Danish law and the Copenhagen City Court, Commercial C1 CMS License (with product warranty), offered as an alternative to the MPL 1.1

### Releases

- currentMajor: 6
- latestReleaseDate: 2026-09-14

### Adoption

- githubStargazers: 263
- packagistDownloads: not applicable
- npmWeeklyDownloads: not applicable
- contributors: 25
- pluginCount: unknown
- packagistMonthlyDownloads: unknown
- ecosystemsMonthlyDownloads: unknown
- httpArchiveSites: unknown
- wordpressActiveInstalls: unknown
- dependentRepos: unknown
- dependentPackages: unknown

### Sources

- urls: https://c1.orckestra.com/ (read 2026-10-24)
- urls: https://api.github.com/repos/Orckestra/C1-CMS-Foundation (read 2026-10-24)
- urls: https://docs.c1.orckestra.com/Getting-started/Guide (read 2026-10-24)
- maintainer: https://raw.githubusercontent.com/Orckestra/C1-CMS-Foundation/dev/license.txt (read 2026-10-24)
- language: https://api.github.com/repos/Orckestra/C1-CMS-Foundation (read 2026-10-24)
- category: https://raw.githubusercontent.com/Orckestra/C1-CMS-Foundation/dev/README.md (read 2026-10-24)
- runtime: https://docs.c1.orckestra.com/Getting-started/System-Requirements (read 2026-10-24)
- runtimeMin: https://docs.c1.orckestra.com/Getting-started/System-Requirements (read 2026-10-24)
- installMethod: https://docs.c1.orckestra.com/Getting-started/Guide/Installation-and-Setup (read 2026-10-24)
- installMethod: https://c1.orckestra.com/Download (read 2026-10-24)
- databases: https://docs.c1.orckestra.com/Getting-started/System-Requirements (read 2026-10-24)
- adminUi: https://raw.githubusercontent.com/Orckestra/C1-CMS-Foundation/dev/README.md (read 2026-10-24)
- license: https://raw.githubusercontent.com/Orckestra/C1-CMS-Foundation/dev/license.txt (read 2026-10-24)
- license: https://raw.githubusercontent.com/Orckestra/C1-CMS-Foundation/dev/license.txt (read 2026-10-24)
- license: https://c1.orckestra.com/Two-licenses (read 2026-10-24)
- templating: https://docs.c1.orckestra.com/Functions (read 2026-10-24)
- licenseModel: https://raw.githubusercontent.com/Orckestra/C1-CMS-Foundation/dev/license.txt (read 2026-10-24)
- firstRelease: https://api.github.com/repos/Orckestra/C1-CMS-Foundation/releases (read 2026-10-24)
- currentMajor: https://api.github.com/repos/Orckestra/C1-CMS-Foundation/releases (read 2026-10-24)
- latestReleaseDate: https://api.github.com/repos/Orckestra/C1-CMS-Foundation/releases (read 2026-10-24)
- githubStargazers: https://api.github.com/repos/Orckestra/C1-CMS-Foundation (read 2026-10-24)
- contributors: https://api.github.com/repos/Orckestra/C1-CMS-Foundation/contributors?per_page=1 (read 2026-10-24)
- contentStore: https://docs.c1.orckestra.com/Getting-started/System-Requirements (read 2026-10-24)
- urls: https://c1.orckestra.com/Add-ons (read 2026-10-24)

## Notes

C1 CMS is a content management system written in C# and built on the Microsoft stack. It runs on ASP.NET with the .NET Framework on Windows, stores content in XML flat files by default or in a Microsoft SQL Server database, and offers the C1 Console as its administrative interface. Developers create CMS Functions with Razor, ASP.NET User Controls, XSLT or SQL. The [installation guide](https://docs.c1.orckestra.com/Getting-started/Guide/Installation-and-Setup) installs it with the Web Platform Installer and runs it in WebMatrix, and the Azure documentation describes hosting one or more websites on Microsoft Azure or a Windows Server. Orckestra A/S maintains the software, which is available under the Mozilla Public License 1.1 or a commercial license, and the company also offers it as a fully managed service.

## Worth knowing

The license amends Section 11 so that disputes involving Orckestra A/S fall under Danish law and the Copenhagen City Court. The system requirements and the installation guide name .NET Framework 4.7.1 and Visual Studio 2017.

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Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Attributes are recorded, never scored; absent means unknown.
Credit, in full: FindSoftware, CC BY 4.0