Comment by adepressedthrow

It seems that there are few options overall, but particularly few OSS options for doing offline storage and sync in native code (_without_ using JavaScript). The only thing I've encountered that really met those requirements (OSS, non-JS) was Couchbase, but it's really not a great experience, and requires complicated setup both for the binary and the server. Adding P2P or CRDT features is even more difficulty.