Fastmail vs sendinblue (now Brevo)

Fastmail (Open-source software developed at Fastmail.) and sendinblue (now Brevo) both appear on the Smoower Developer Ecosystem Index.

sendinblue (now Brevo) (rank #372) holds a narrow lead over Fastmail (rank #430) on the overall Smoower ecosystem score (42 vs 40). The gap of 2 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 Fastmail. On education (docs, guides and learning material for developers), sendinblue (now Brevo) is ahead of Fastmail. On community (issue response, PR reviews and discussion health), Fastmail is ahead of sendinblue (now Brevo). On reach (how visible the ecosystem is beyond its own repos), Fastmail is clearly ahead of sendinblue (now Brevo). On momentum (release cadence and how fast the ecosystem moves), Fastmail is clearly ahead of sendinblue (now Brevo).

Fastmail carries 6,316 GitHub stars across 38 public repos, with 12 repositories active in the last 90 days and 2 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 Fastmail's footprint is roughly 9.7x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Fastmail is the stronger read for anyone weighting reach. sendinblue (now Brevo) looks better where code quality 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.