On the main website: rings.social, top right button, although it's still a work in progress and lacks a few features to call it an MVP.

The code for the frontend and backend are open source btw.
You can also join us on Slack to discuss about the platform and to propose features / ideas.

See rings.social/about for more information

Rings Social author here.
Any chance of making a Sync for Rings?

It should be as easy as changing the Reddit API endpoint in the Sync for Reddit app to https://api.rings.social