15Five vs MailerSend

15Five and MailerSend (Email service that delivers) both appear on the Smoower Developer Ecosystem Index.

MailerSend (rank #401) holds a modest lead over 15Five (rank #693) on the overall Smoower ecosystem score (41 vs 31). The gap of 10 points reflects composite signals across code, docs, community and reach.

On code quality (the state of repositories, tests, releases and polish), MailerSend is slightly ahead of 15Five. On education (docs, guides and learning material for developers), MailerSend is clearly ahead of 15Five. On community (issue response, PR reviews and discussion health), 15Five is slightly ahead of MailerSend. On reach (how visible the ecosystem is beyond its own repos), MailerSend is ahead of 15Five. On momentum (release cadence and how fast the ecosystem moves), 15Five is slightly ahead of MailerSend.

15Five carries 141 GitHub stars across 29 public repos, with 2 repositories active in the last 90 days and 5 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 MailerSend's footprint is roughly 3.5x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

15Five is the stronger read for anyone weighting momentum. 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.