To my understanding, Reka is more of a core no-code builder library while we're an implementation of it. Now I'm considering if we should use Reka to build out the rest of the editor.

With Builder.io, you have to set up a component to inject their UI into your app. It's more difficult to set up and maintain the components. We're opting to give full control of the code. You can develop with Onlook locally without internet for example.