Customer IO vs sendinblue (now Brevo)

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

Customer IO (rank #165) holds a modest lead over sendinblue (now Brevo) (rank #372) on the overall Smoower ecosystem score (51 vs 42). The gap of 9 points reflects composite signals across code, docs, community and reach.

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

Customer IO carries 684 GitHub stars across 107 public repos, with 42 repositories active in the last 90 days and 26 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.

Customer IO is the stronger read for anyone weighting momentum. sendinblue (now Brevo) makes more sense for teams already using its adjacent tools. The table below breaks the scores down pillar by pillar; the linked profiles cover the underlying repos, docs and community signals in full.