SumUp

SumUp ranks 180th overall in the developer tools category with a composite score of 53 out of 100. The organization describes itself as Also OSS at https://github.com/sumup-oss, which frames how developers first encounter the brand on GitHub, in package registries and in search results.

Its developer reach and AI and agent readiness come across as strong, and are what most developers will notice first when they land on the organization. By contrast, its developer experience and community engagement look minimal today, which is the clearest area where a small amount of focused work would visibly move the needle. Taken together, the picture is of a company whose public developer surface is neither uniformly polished nor uniformly weak, and where different audiences (contributors, integrators, evaluators) will likely form very different first impressions depending on which door they walk through.

SumUp maintains 128 public repositories on GitHub, built primarily in Kotlin, Swift and PHP, which together have collected 502 stars and drawn contributions from 9 developers outside the core team, 27 of those repositories have seen commits in the last 90 days, a useful proxy for how much of the codebase is genuinely alive rather than archived.

For anyone evaluating SumUp as a technology choice, weighing a contribution, integrating the APIs, or comparing it against similar companies in the space, the sections below break down each of these signals in detail and link straight through to the underlying repositories, documentation and community threads that inform the score.