Comment by vunderba

It kind of depends on what you build.

Shah Kur is a chess trainer that lets you set novel types of invisibility to help teach you to learn to play blindfold chess (without a board). It's got VAD + voice recognition (can use on your phone hands-free) alongside a WASM implementation of the chess engine, etc.

Lend Me Your Ears is a free piano game in the style of the old "Simon" toy which presents players with a sequence of musical notes and challenges them to reproduce the sequence using either an on-screen piano or a connected MIDI keyboard. It uses the Web MIDI API and YIN for realtime accurate detection of notes (so you can use a guitar for example).

That's just a few examples, but you'd be surprised how far you can get with nothing more than a client-side application.