I just publish a library called redoc_ui_plug | Hex. The library renders Redoc UI from the openapi specification url. I used this library together with open_api_spex, produce the openapi specification by using open_api_spex and render it using Redoc instead of Swagger.
The backlog in roadmap:
- Code example per API (Inject code example per API · Issue #1 · wingyplus/redoc_ui_plug · GitHub).
- More example programming languages.
If you’re using and found any problems, please open an issue. Feedback & Pull Request are very welcome. 
