Excalidraw vs Fastmail

Excalidraw (Excalidraw is a whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them.) and Fastmail (Open-source software developed at Fastmail.) both appear on the Smoower Developer Ecosystem Index.

Excalidraw (rank #103) holds a modest lead over Fastmail (rank #430) on the overall Smoower ecosystem score (55 vs 40). The gap of 15 points reflects composite signals across code, docs, community and reach.

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

Excalidraw carries 136,744 GitHub stars across 25 public repos, with 3 repositories active in the last 90 days and 215 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 Excalidraw's footprint is roughly 21.7x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Excalidraw is the stronger read for anyone weighting code quality. Fastmail looks better where momentum 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.