Fastmail vs Omnisend

Fastmail (Open-source software developed at Fastmail.) and Omnisend (Omnisend’s AI-powered platform helps ecommerce brands centralize email, SMS, and popups with automation, segmentation, and AI content tools.) both appear on the Smoower Developer Ecosystem Index.

Fastmail (rank #430) holds a narrow lead over Omnisend (rank #625) on the overall Smoower ecosystem score (40 vs 33). The gap of 7 points reflects composite signals across code, docs, community and reach.

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

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. Omnisend shows 5 stars across 18 public repos, 9 active in the last 90 days and 4 external contributors. The star gap on its own does not decide the comparison, but Fastmail's footprint is roughly 1263.2x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

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