another question: is it possible to use login/register etc in react native without opening the webbrowser (no popup/redirect etc) -- just pure native experience?

hey @0xwess yes it is possible. But then you will have to build your own UI in react native, and can utilise our frontend react native SDK for session management

awesome is it possible to achieve it without the backend node js code/server? like just using your SDK on the frontend, as I would do with cognito for example?

not really. You need to use our backend SDK