Fastmail vs Grammarly

Fastmail (Open-source software developed at Fastmail.) and Grammarly (Millions of users rely on Grammarly's AI-powered products to make their messages, documents, and social media posts clear, mistake-free, and impactful.) both appear on the Smoower Developer Ecosystem Index.

Fastmail (rank #430) holds a narrow lead over Grammarly (rank #602) on the overall Smoower ecosystem score (40 vs 34). 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), Grammarly is slightly ahead of Fastmail. On education (docs, guides and learning material for developers), Fastmail is ahead of Grammarly. On community (issue response, PR reviews and discussion health), Fastmail is slightly ahead of Grammarly. On reach (how visible the ecosystem is beyond its own repos), Fastmail is clearly ahead of Grammarly. On momentum (release cadence and how fast the ecosystem moves), Fastmail is ahead of Grammarly.

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. Grammarly shows 4,355 stars across 23 public repos, 0 active in the last 90 days and 0 external contributors.

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