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Umbraco vs Plone: catalog facts
Umbraco	Plone
Free The CMS is free and open source under the MIT licence.	Free Free and open source, backed by the Plone Foundation.
Self-hosted	Self-hosted
Built on modern .NET and ASP.NET Core Editor-friendly backoffice	Long security track record Headless mode with a REST API
Requires .NET development skills to build sites Marketing focuses on enterprise and sales-led services	Python and React stack is heavier than a simple PHP CMS Better suited to organisations than small personal sites
Self-hosted	Self-hosted
Open source	Open source
License: MIT	License: ZPL-2.0
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.