Adyen vs Calendly

Adyen and Calendly (Simple, beautiful scheduling.) both appear on the Smoower Developer Ecosystem Index.

Adyen (rank #161) holds a meaningful lead over Calendly (rank #729) on the overall Smoower ecosystem score (51 vs 30). The gap of 21 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 Calendly. On education (docs, guides and learning material for developers), Calendly is slightly ahead of Adyen. On community (issue response, PR reviews and discussion health), Adyen is clearly ahead of Calendly. On reach (how visible the ecosystem is beyond its own repos), Calendly is clearly ahead of Adyen. On momentum (release cadence and how fast the ecosystem moves), Adyen is clearly ahead of Calendly.

Adyen carries 2,687 GitHub stars across 65 public repos, with 48 repositories active in the last 90 days and 38 external contributors on record. Calendly shows 132 stars across 29 public repos, 0 active in the last 90 days and 0 external contributors. The star gap on its own does not decide the comparison, but Adyen's footprint is roughly 20.4x 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. Calendly 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.