Fastmail vs Twilio SendGrid

Fastmail (Open-source software developed at Fastmail.) and Twilio SendGrid (Official open source libraries - send emails and integrate with our APIs fast.) both appear on the Smoower Developer Ecosystem Index.

Twilio SendGrid (rank #55) holds a modest lead over Fastmail (rank #430) on the overall Smoower ecosystem score (60 vs 40). The gap of 20 points reflects composite signals across code, docs, community and reach.

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

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. Twilio SendGrid shows 12,177 stars across 125 public repos, 23 active in the last 90 days and 9 external contributors.

Fastmail is the stronger read for anyone weighting reach. Twilio SendGrid 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.