37signals vs Fillout

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

37signals (rank #122) holds a modest lead over Fillout (rank #510) on the overall Smoower ecosystem score (54 vs 37). 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), 37signals is clearly ahead of Fillout. On education (docs, guides and learning material for developers), 37signals is slightly ahead of Fillout. On community (issue response, PR reviews and discussion health), 37signals is clearly ahead of Fillout. On reach (how visible the ecosystem is beyond its own repos), 37signals is slightly ahead of Fillout. On momentum (release cadence and how fast the ecosystem moves), 37signals is clearly ahead of Fillout.

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. Fillout shows 2 stars across 9 public repos, 3 active in the last 90 days and 3 external contributors. The star gap on its own does not decide the comparison, but 37signals's footprint is roughly 56928.5x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

37signals is the stronger read for anyone weighting momentum. Fillout makes more sense for teams already using its adjacent tools. The table below breaks the scores down pillar by pillar; the linked profiles cover the underlying repos, docs and community signals in full.