Fastmail vs Zuora

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

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

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. Zuora shows 10 stars across 21 public repos, 1 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 631.6x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Fastmail is the stronger read for anyone weighting reach. Zuora looks better where education 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.