Comment by cxr

> It's open source and built with Firebase for auth and data sync.

Consider also supporting remoteStorage <http://remotestorage.org/>, both so that you don't have to operate (admin/provision/whatever) services, and to make it easier for contributors (they don't need to prop something up, either, even if it is just Firebase). And just general user control over data.

If you run into any serious issues, you're likely to get a fair bit of interest on the remoteStorage community message boards to help work things out.

PS: add screenshots somewhere.