Duo Security vs Fastmail

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

Duo Security (rank #278) holds a narrow lead over Fastmail (rank #430) on the overall Smoower ecosystem score (46 vs 40). The gap of 6 points reflects composite signals across code, docs, community and reach.

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

Duo Security carries 1,477 GitHub stars across 52 public repos, with 15 repositories active in the last 90 days and 6 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 4.3x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Duo Security 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.