Comment by dtkav

Hey, developer behind Relay here.

Yes, our sync engine is home-grown. We use CRDTs to provide real-time google-docs-like collaboration which is not something Obsidian supports (yet... i think they are working on it).

Note that you can self-host a Relay server and join it to our network. This gives you complete control over your data and unmetered storage. We do still charge for seats if you have more than 3 collaborators.