Fastmail vs Fillout

Fastmail (Open-source software developed at Fastmail.) and Fillout both appear on the Smoower Developer Ecosystem Index.

Fastmail (rank #430) holds a narrow lead over Fillout (rank #510) on the overall Smoower ecosystem score (40 vs 37). The gap of 3 points reflects composite signals across code, docs, community and reach.

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

Fastmail carries 6,316 GitHub stars across 38 public repos, with 12 repositories active in the last 90 days and 2 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 Fastmail's footprint is roughly 3158.0x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Fastmail 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.