37signals vs Mattermost

37signals (HEY! It's in Basecamp!) and Mattermost (Mattermost is a secure collaboration platform for connecting your teams, tools and processes to accelerate mission-critical work.) both appear on the Smoower Developer Ecosystem Index.

Mattermost (rank #38) holds a narrow lead over 37signals (rank #122) on the overall Smoower ecosystem score (62 vs 54). The gap of 8 points reflects composite signals across code, docs, community and reach.

On code quality (the state of repositories, tests, releases and polish), Mattermost is ahead of 37signals. On education (docs, guides and learning material for developers), Mattermost is ahead of 37signals. On community (issue response, PR reviews and discussion health), 37signals is slightly ahead of Mattermost. On reach (how visible the ecosystem is beyond its own repos), Mattermost is clearly ahead of 37signals. On momentum (release cadence and how fast the ecosystem moves), Mattermost 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. Mattermost shows 49,882 stars across 262 public repos, 58 active in the last 90 days and 105 external contributors.

37signals is the stronger read for anyone weighting community. Mattermost 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.