Customer IO vs Starling Bank

Customer IO and Starling Bank both appear on the Smoower Developer Ecosystem Index.

Customer IO (rank #165) holds a modest lead over Starling Bank (rank #625) on the overall Smoower ecosystem score (51 vs 33). The gap of 18 points reflects composite signals across code, docs, community and reach.

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

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. Starling Bank shows 195 stars across 3 public repos, 3 active in the last 90 days and 0 external contributors. The star gap on its own does not decide the comparison, but Customer IO's footprint is roughly 3.5x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Customer IO is the stronger read for anyone weighting community. Starling Bank 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.