Klaviyo vs PostHog

Klaviyo and PostHog (The single platform to analyze, test, observe, and deploy new features) both appear on the Smoower Developer Ecosystem Index.

PostHog (rank #31) holds a modest lead over Klaviyo (rank #237) on the overall Smoower ecosystem score (63 vs 48). 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), PostHog is clearly ahead of Klaviyo. On education (docs, guides and learning material for developers), PostHog is slightly ahead of Klaviyo. On community (issue response, PR reviews and discussion health), PostHog is slightly ahead of Klaviyo. On reach (how visible the ecosystem is beyond its own repos), Klaviyo is ahead of PostHog. On momentum (release cadence and how fast the ecosystem moves), PostHog 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. PostHog shows 40,819 stars across 357 public repos, 87 active in the last 90 days and 210 external contributors. The star gap on its own does not decide the comparison, but PostHog's footprint is roughly 71.2x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Klaviyo is the stronger read for anyone weighting reach. PostHog 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.