15Five vs Mailchimp

15Five and Mailchimp (Mailchimp is an all-in-one marketing platform that helps you manage and talk to your clients, customers, and other interested parties.) both appear on the Smoower Developer Ecosystem Index.

Mailchimp (rank #317) holds a modest lead over 15Five (rank #693) on the overall Smoower ecosystem score (44 vs 31). The gap of 13 points reflects composite signals across code, docs, community and reach.

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

15Five carries 141 GitHub stars across 29 public repos, with 2 repositories active in the last 90 days and 5 external contributors on record. Mailchimp shows 8,980 stars across 28 public repos, 6 active in the last 90 days and 6 external contributors. The star gap on its own does not decide the comparison, but Mailchimp's footprint is roughly 63.7x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

15Five is the stronger read for anyone weighting momentum. Mailchimp looks better where reach 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.