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OTOBO vs Zammad: catalog facts
OTOBO	Zammad
Free Open source with no licence fees.	Free The self-hosted community edition is free; hosted plans are sold separately.
Web, Self-hosted	Linux, Web, Self-hosted
No licence costs ITSM processes based on ITIL practices	Packages for Debian, Ubuntu and CentOS plus Docker Actively released
You have to host and maintain the server yourself Website content is mainly in German	Server runs on Linux only Heavier to set up than simple PHP help desks
Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
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 September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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