Fastmail vs Guesty

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

Fastmail (rank #430) holds a narrow lead over Guesty (rank #662) on the overall Smoower ecosystem score (40 vs 32). 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), Guesty is slightly ahead of Fastmail. On education (docs, guides and learning material for developers), Guesty is slightly ahead of Fastmail. On community (issue response, PR reviews and discussion health), Fastmail is slightly ahead of Guesty. On reach (how visible the ecosystem is beyond its own repos), Fastmail is clearly ahead of Guesty. On momentum (release cadence and how fast the ecosystem moves), Fastmail is clearly ahead of Guesty.

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. Guesty shows 1 stars across 21 public repos, 1 active in the last 90 days and 1 external contributors. The star gap on its own does not decide the comparison, but Fastmail's footprint is roughly 6316.0x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Fastmail is the stronger read for anyone weighting reach. Guesty 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.