Fastmail vs Heap

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

Fastmail (rank #430) holds a narrow lead over Heap (rank #569) on the overall Smoower ecosystem score (40 vs 35). The gap of 5 points reflects composite signals across code, docs, community and reach.

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

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. Heap shows 215 stars across 65 public repos, 6 active in the last 90 days and 1 external contributors. The star gap on its own does not decide the comparison, but Fastmail's footprint is roughly 29.4x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Fastmail is the stronger read for anyone weighting reach. Heap looks better where education 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.