Clio vs Fastmail

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

Fastmail (rank #430) holds a narrow lead over Clio (rank #625) on the overall Smoower ecosystem score (40 vs 33). The gap of 7 points reflects composite signals across code, docs, community and reach.

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

Clio carries 518 GitHub stars across 19 public repos, with 4 repositories active in the last 90 days and 3 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 12.2x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Clio is the stronger read for anyone weighting education. 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.