Adyen vs Klaviyo

Adyen and Klaviyo both appear on the Smoower Developer Ecosystem Index.

Adyen (rank #165) holds a narrow lead over Klaviyo (rank #237) on the overall Smoower ecosystem score (51 vs 48). The gap of 3 points reflects composite signals across code, docs, community and reach.

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

Adyen carries 2,684 GitHub stars across 65 public repos, with 49 repositories active in the last 90 days and 39 external contributors on record. Klaviyo shows 573 stars across 117 public repos, 23 active in the last 90 days and 17 external contributors. The star gap on its own does not decide the comparison, but Adyen's footprint is roughly 4.7x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Adyen is the stronger read for anyone weighting code quality. Klaviyo looks better where reach 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.