The other self-hostable desk buyers shortlist, and the exact inverse on open-source policy. Chatwoot's free build withholds SSO, custom roles and audit logs; Zammad ships all three in its AGPL build and charges only for hosting.
Also free to self-host, but monetised by selling features back as paid modules rather than by hosting. Zammad's free build is claimed complete; FreeScout's is deliberately not.
A named source in Zammad's Migration Wizard, which pulls tickets over the Zendesk API. The comparison is seats plus automated resolutions in US and EU regions against seats plus AI calls in Germany only.
Another named migration source. Overlaps on the per-agent ladder and the bundled knowledge base, but is cloud-only with no self-hosted path and no German-only hosting option.
3 of 9 not published by Zammad, checked