Attio vs Fastmail

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

Fastmail (rank #430) holds a narrow lead over Attio (rank #569) on the overall Smoower ecosystem score (40 vs 35). The gap of 5 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 Attio. On education (docs, guides and learning material for developers), Fastmail is ahead of Attio. On community (issue response, PR reviews and discussion health), Fastmail is ahead of Attio. On reach (how visible the ecosystem is beyond its own repos), Fastmail is clearly ahead of Attio. On momentum (release cadence and how fast the ecosystem moves), Fastmail is ahead of Attio.

Attio carries 90 GitHub stars across 19 public repos, with 13 repositories active in the last 90 days and 1 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 70.2x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Attio is worth a look for teams already invested in its stack. Fastmail looks better where reach 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.