React Native and (maybe) Electron are nice if you need access to real networking but want to write webtech, and can afford to impose somewhat on your end user.

React Native and (maybe) Electron are nice if you need access to real networking but want to write webtech, and can afford to impose somewhat on your end user. Browsers (very much rightly, IMO) lack a lot of handy stuff for local device discovery, including, notably, all of UDP.