Customer IO vs Mollie

Customer IO and Mollie (Building a payments and banking stack for makers.) both appear on the Smoower Developer Ecosystem Index.

Mollie (rank #122) holds a narrow lead over Customer IO (rank #165) on the overall Smoower ecosystem score (54 vs 51). 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), Mollie is ahead of Customer IO. On education (docs, guides and learning material for developers), Mollie is slightly ahead of Customer IO. On community (issue response, PR reviews and discussion health), Mollie is slightly ahead of Customer IO. On reach (how visible the ecosystem is beyond its own repos), Customer IO is ahead of Mollie. On momentum (release cadence and how fast the ecosystem moves), Customer IO is slightly ahead of Mollie.

Customer IO carries 684 GitHub stars across 107 public repos, with 42 repositories active in the last 90 days and 26 external contributors on record. Mollie shows 2,571 stars across 85 public repos, 30 active in the last 90 days and 26 external contributors. The star gap on its own does not decide the comparison, but Mollie's footprint is roughly 3.8x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Customer IO is the stronger read for anyone weighting reach. Mollie 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.