Calendly vs Klaviyo

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

Klaviyo (rank #237) holds a modest lead over Calendly (rank #729) on the overall Smoower ecosystem score (48 vs 30). The gap of 18 points reflects composite signals across code, docs, community and reach.

On code quality (the state of repositories, tests, releases and polish), Klaviyo is clearly ahead of Calendly. On education (docs, guides and learning material for developers), Klaviyo is slightly ahead of Calendly. On community (issue response, PR reviews and discussion health), Klaviyo is clearly ahead of Calendly. On reach (how visible the ecosystem is beyond its own repos), Calendly is ahead of Klaviyo. On momentum (release cadence and how fast the ecosystem moves), Klaviyo 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. Klaviyo shows 573 stars across 117 public repos, 23 active in the last 90 days and 17 external contributors. The star gap on its own does not decide the comparison, but Klaviyo's footprint is roughly 4.3x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Calendly is the stronger read for anyone weighting reach. Klaviyo looks better where community 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.