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mailcow vs Mailu

The same facts for both, read from GitHub every night, and the relation a person reviewed.

mailcow vs Mailu
Fact	mailcow	Mailu
Language	JavaScript	Python
Licence	GPL-3.0	Other
Stars	14k	7.5k
Latest	2026-09a	2024.06.61
Last push	2026-10-06	2026-10-06
Release cadence	about 18 days between releases	about 11 days between releases
Active contributors	11 commit authors on the default branch in the last 90 days	7 commit authors on the default branch in the last 90 days
Flags	none	none

How they relate

Both replace Google Workspace. Alternatives to Google Workspace →
PartialmailcowMail, calendars and contacts with SOGo webmail; no office suite.
PartialMailuMail with webmail, spam filtering and an admin UI.