Fastmail vs Mollie

Fastmail (Open-source software developed at Fastmail.) and Mollie (Building a payments and banking stack for makers.) both appear on the Smoower Developer Ecosystem Index.

Mollie (rank #122) holds a modest lead over Fastmail (rank #430) on the overall Smoower ecosystem score (54 vs 40). The gap of 14 points reflects composite signals across code, docs, community and reach.

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

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. Mollie shows 2,571 stars across 85 public repos, 30 active in the last 90 days and 26 external contributors.

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