37signals vs Zeplin

37signals (HEY! It's in Basecamp!) and Zeplin both appear on the Smoower Developer Ecosystem Index.

37signals (rank #122) holds a modest lead over Zeplin (rank #430) on the overall Smoower ecosystem score (54 vs 40). The gap of 14 points reflects composite signals across code, docs, community and reach.

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

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. Zeplin shows 1,460 stars across 57 public repos, 8 active in the last 90 days and 4 external contributors. The star gap on its own does not decide the comparison, but 37signals's footprint is roughly 78.0x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

37signals is the stronger read for anyone weighting reach. Zeplin 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.