KAYAK vs MailerSend

KAYAK and MailerSend (Email service that delivers) both appear on the Smoower Developer Ecosystem Index.

MailerSend (rank #401) holds a narrow lead over KAYAK (rank #485) on the overall Smoower ecosystem score (41 vs 38). The gap of 3 points reflects composite signals across code, docs, community and reach.

On code quality (the state of repositories, tests, releases and polish), KAYAK is ahead of MailerSend. On education (docs, guides and learning material for developers), MailerSend is clearly ahead of KAYAK. On reach (how visible the ecosystem is beyond its own repos), KAYAK is ahead of MailerSend. On momentum (release cadence and how fast the ecosystem moves), KAYAK is ahead of MailerSend.

KAYAK carries 3,186 GitHub stars across 72 public repos, with 4 repositories active in the last 90 days and 1 external contributors on record. MailerSend shows 499 stars across 22 public repos, 12 active in the last 90 days and 7 external contributors. The star gap on its own does not decide the comparison, but KAYAK's footprint is roughly 6.4x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

KAYAK is the stronger read for anyone weighting reach. MailerSend 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.