15Five vs Klaviyo

15Five and Klaviyo both appear on the Smoower Developer Ecosystem Index.

Klaviyo (rank #237) holds a modest lead over 15Five (rank #693) on the overall Smoower ecosystem score (48 vs 31). The gap of 17 points reflects composite signals across code, docs, community and reach.

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

15Five carries 141 GitHub stars across 29 public repos, with 2 repositories active in the last 90 days and 5 external contributors on record. Klaviyo shows 573 stars across 117 public repos, 23 active in the last 90 days and 17 external contributors. The star gap on its own does not decide the comparison, but Klaviyo's footprint is roughly 4.1x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

15Five is worth a look for teams already invested in its stack. Klaviyo 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.