Calendly vs Zammad

Calendly (Simple, beautiful scheduling.) and Zammad both appear on the Smoower Developer Ecosystem Index.

Zammad (rank #485) holds a narrow lead over Calendly (rank #729) on the overall Smoower ecosystem score (38 vs 30). The gap of 8 points reflects composite signals across code, docs, community and reach.

On code quality (the state of repositories, tests, releases and polish), Zammad is clearly ahead of Calendly. On education (docs, guides and learning material for developers), Zammad is slightly ahead of Calendly. On community (issue response, PR reviews and discussion health), Zammad is clearly ahead of Calendly. On momentum (release cadence and how fast the ecosystem moves), Zammad is clearly ahead of Calendly.

Calendly carries 132 GitHub stars across 29 public repos, with 0 repositories active in the last 90 days and 0 external contributors on record. Zammad shows 6,409 stars across 11 public repos, 9 active in the last 90 days and 27 external contributors. The star gap on its own does not decide the comparison, but Zammad's footprint is roughly 48.6x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Calendly is worth a look for teams already invested in its stack. Zammad looks better where momentum is the deciding factor. The table below breaks the scores down pillar by pillar; the linked profiles cover the underlying repos, docs and community signals in full.