Fastmail vs Quo

Fastmail (Open-source software developed at Fastmail.) and Quo (World's best business phone app) both appear on the Smoower Developer Ecosystem Index.

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

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. Quo shows 12 stars across 20 public repos, 2 active in the last 90 days and 0 external contributors. The star gap on its own does not decide the comparison, but Fastmail's footprint is roughly 526.3x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

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