I vibe-coded an app using MLS/MDK (ie. the library that White Noise is based) on, and I included Cashu via the Cashu Dev Kit.
I'm not saying my app is any good, it's just a fun side project to get me into privacy tech 😀. But I found it quite easy because they (the White Noise Folks and the Cashu folks) made libraries that are reasonably easy to use.
And my app "should" be compatible with other apps using the same protocol. So I'm very optimistic that some of these apps will take off sooner or later
Demo video here: https://youtu.be/DGtZrOkbe5U
PWA app here: https://chat.satsandsports.cash/