Affinity vs Fastmail

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

Fastmail (rank #430) holds a narrow lead over Affinity (rank #536) on the overall Smoower ecosystem score (40 vs 36). The gap of 4 points reflects composite signals across code, docs, community and reach.

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

Affinity carries 4 GitHub stars across 40 public repos, with 1 repositories active in the last 90 days and 2 external contributors on record. Fastmail shows 6,316 stars across 38 public repos, 12 active in the last 90 days and 2 external contributors. The star gap on its own does not decide the comparison, but Fastmail's footprint is roughly 1579.0x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Affinity is the stronger read for anyone weighting code quality. Fastmail 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.