Fastmail vs Modern Treasury

Fastmail (Open-source software developed at Fastmail.) and Modern Treasury (Modern Treasury builds payment operations software. Use our web application or API to manage the full cycle of money movement.) both appear on the Smoower Developer Ecosystem Index.

Fastmail (rank #430) holds a narrow lead over Modern Treasury (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), Modern Treasury is ahead of Fastmail. On education (docs, guides and learning material for developers), Modern Treasury is ahead of Fastmail. On community (issue response, PR reviews and discussion health), Fastmail is slightly ahead of Modern Treasury. On reach (how visible the ecosystem is beyond its own repos), Fastmail is clearly ahead of Modern Treasury. On momentum (release cadence and how fast the ecosystem moves), Fastmail is ahead of Modern Treasury.

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. Modern Treasury shows 182 stars across 14 public repos, 8 active in the last 90 days and 5 external contributors. The star gap on its own does not decide the comparison, but Fastmail's footprint is roughly 34.7x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Fastmail is the stronger read for anyone weighting reach. Modern Treasury 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.