I did try https://www.apimatic.io/ and https://app.swaggerhub.com/, there is also https://editor.swagger.io/ but still I need to write the swagger manually then I use code generation tools to build the clients consumming the API.
No code tools like that couls also be a pitfall when someting turns wrong and you have no way to debug the issue, but still this is very interresting ... Are you the creator of https://www.getspeedy.app ?