Klaviyo vs Twilio SendGrid

Klaviyo 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 Klaviyo (rank #237) on the overall Smoower ecosystem score (60 vs 48). The gap of 12 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 Klaviyo. On education (docs, guides and learning material for developers), Twilio SendGrid is ahead of Klaviyo. On community (issue response, PR reviews and discussion health), Klaviyo is ahead of Twilio SendGrid. On reach (how visible the ecosystem is beyond its own repos), Twilio SendGrid is clearly ahead of Klaviyo.

Klaviyo carries 573 GitHub stars across 117 public repos, with 23 repositories active in the last 90 days and 17 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. The star gap on its own does not decide the comparison, but Twilio SendGrid's footprint is roughly 21.3x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Klaviyo is the stronger read for anyone weighting community. 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.