Fastmail vs KAYAK

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

Fastmail (rank #430) holds a narrow lead over KAYAK (rank #485) on the overall Smoower ecosystem score (40 vs 38). The gap of 2 points reflects composite signals across code, docs, community and reach.

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

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. KAYAK shows 3,186 stars across 72 public repos, 4 active in the last 90 days and 1 external contributors.

Fastmail is the stronger read for anyone weighting reach. KAYAK looks better where code quality 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.