Not yet, but nostr:nprofile1qqswa8vhnelpgx9f7arjhtuzmjtqs2sdgfgmw77tzu9xankf87kl7eqppemhxue69uhkummn9ekx7mp0qyfhwumn8ghj7am0wsh82arcduhx7mn99uq3kamnwvaz7tmgv9mx2m3wv93kx6t0d3ujuum0vd5kzmp0gy8dgf has been thinking about starting one.

It's not hard to implement the sync, but it is VERY hard to make it look good for grandmas to use and see where their things are. The UI/UX is the hard part. It's at least a 3month project if the dev is terrific in UI development. But most likely a 6-9mo project for the average dev.