Calendly vs sendinblue (now Brevo)

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

sendinblue (now Brevo) (rank #371) holds a modest lead over Calendly (rank #729) on the overall Smoower ecosystem score (42 vs 30). The gap of 12 points reflects composite signals across code, docs, community and reach.

On code quality (the state of repositories, tests, releases and polish), sendinblue (now Brevo) is ahead of Calendly. On education (docs, guides and learning material for developers), sendinblue (now Brevo) is clearly ahead of Calendly. On community (issue response, PR reviews and discussion health), sendinblue (now Brevo) is slightly ahead of Calendly. On reach (how visible the ecosystem is beyond its own repos), Calendly is ahead of sendinblue (now Brevo).

Calendly carries 132 GitHub stars across 29 public repos, with 0 repositories active in the last 90 days and 0 external contributors on record. sendinblue (now Brevo) shows 653 stars across 37 public repos, 0 active in the last 90 days and 0 external contributors. The star gap on its own does not decide the comparison, but sendinblue (now Brevo)'s footprint is roughly 4.9x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Calendly is the stronger read for anyone weighting reach. sendinblue (now Brevo) looks better where education 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.