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FlatPress vs Serendipity: catalog facts
FlatPress	Serendipity
Free Free and open source under the GPL-2.0 licence.	Free Free and open source under the BSD 3-Clause licence.
Self-hosted	Self-hosted
No database; backups are a file copy Plugin system with widgets and Smarty themes	Long track record since 2002 Plugin and theme repository installable from the admin
Aimed at blogs rather than larger structured websites Smaller theme and plugin choice than major CMSs	Smaller community than WordPress Classic PHP blog design rather than a modern headless setup
Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0	License: BSD-3-Clause
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.