Fastmail vs Squarespace

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

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

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. Squarespace shows 2,038 stars across 98 public repos, 6 active in the last 90 days and 1 external contributors. The star gap on its own does not decide the comparison, but Fastmail's footprint is roughly 3.1x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

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