37signals vs SlackAPI

37signals (HEY! It's in Basecamp!) and SlackAPI (https://docs.slack.dev/tools) both appear on the Smoower Developer Ecosystem Index.

SlackAPI (rank #47) holds a narrow lead over 37signals (rank #122) on the overall Smoower ecosystem score (61 vs 54). The gap of 7 points reflects composite signals across code, docs, community and reach.

On code quality (the state of repositories, tests, releases and polish), SlackAPI is clearly ahead of 37signals. On education (docs, guides and learning material for developers), SlackAPI is slightly ahead of 37signals. On community (issue response, PR reviews and discussion health), 37signals is ahead of SlackAPI. On reach (how visible the ecosystem is beyond its own repos), 37signals is clearly ahead of SlackAPI. On momentum (release cadence and how fast the ecosystem moves), SlackAPI is clearly ahead of 37signals.

37signals carries 113,857 GitHub stars across 236 public repos, with 48 repositories active in the last 90 days and 298 external contributors on record. SlackAPI shows 17,894 stars across 37 public repos, 19 active in the last 90 days and 39 external contributors. The star gap on its own does not decide the comparison, but 37signals's footprint is roughly 6.4x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

37signals is the stronger read for anyone weighting reach. SlackAPI looks better where momentum 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.