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Silverstripe CMS vs Umbraco: catalog facts
Silverstripe CMS	Umbraco
Free Free and open source under the BSD-3-Clause licence.	Free The CMS is free and open source under the MIT licence.
Self-hosted	Self-hosted
CMS and MVC application framework in one package Permissive BSD licence	Built on modern .NET and ASP.NET Core Editor-friendly backoffice
Needs developer work to build custom sites Requires your own server to run	Requires .NET development skills to build sites Marketing focuses on enterprise and sales-led services
Self-hosted	Self-hosted
Open source	Open source
License: BSD-3-Clause	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.