Contentsquare vs Fastmail

Contentsquare (Web optimization, testing & UX solutions) and Fastmail (Open-source software developed at Fastmail.) both appear on the Smoower Developer Ecosystem Index.

Fastmail (rank #430) holds a narrow lead over Contentsquare (rank #510) on the overall Smoower ecosystem score (40 vs 37). The gap of 3 points reflects composite signals across code, docs, community and reach.

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

Contentsquare carries 1,493 GitHub stars across 292 public repos, with 100 repositories active in the last 90 days and 15 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 4.2x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Contentsquare is the stronger read for anyone weighting momentum. 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.