37signals vs Zulip

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

37signals (rank #122) holds a modest lead over Zulip (rank #536) on the overall Smoower ecosystem score (54 vs 36). The gap of 18 points reflects composite signals across code, docs, community and reach.

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

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. Zulip shows 32,299 stars across 67 public repos, 9 active in the last 90 days and 76 external contributors. The star gap on its own does not decide the comparison, but 37signals's footprint is roughly 3.5x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

37signals is the stronger read for anyone weighting reach. Zulip looks better where code quality 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.