Culture Amp vs Fastmail

Culture Amp (The employee feedback platform) and Fastmail (Open-source software developed at Fastmail.) both appear on the Smoower Developer Ecosystem Index.

Fastmail (rank #430) holds a modest lead over Culture Amp (rank #693) on the overall Smoower ecosystem score (40 vs 31). The gap of 9 points reflects composite signals across code, docs, community and reach.

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

Culture Amp carries 1,202 GitHub stars across 179 public repos, with 17 repositories active in the last 90 days and 18 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 5.3x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Culture Amp is the stronger read for anyone weighting code quality. 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.