Klaviyo vs sendinblue (now Brevo)

Klaviyo and sendinblue (now Brevo) both appear on the Smoower Developer Ecosystem Index.

Klaviyo (rank #237) holds a narrow lead over sendinblue (now Brevo) (rank #372) on the overall Smoower ecosystem score (48 vs 42). The gap of 6 points reflects composite signals across code, docs, community and reach.

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

Klaviyo carries 573 GitHub stars across 117 public repos, with 23 repositories active in the last 90 days and 17 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.

Klaviyo is the stronger read for anyone weighting community. 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.