Fastmail vs Kajabi

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

Fastmail (rank #430) holds a narrow lead over Kajabi (rank #662) on the overall Smoower ecosystem score (40 vs 32). The gap of 8 points reflects composite signals across code, docs, community and reach.

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

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. Kajabi shows 99 stars across 103 public repos, 8 active in the last 90 days and 11 external contributors. The star gap on its own does not decide the comparison, but Fastmail's footprint is roughly 63.8x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

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