NOTE: Yattee is on the AppStore, but without any sources/instances by default. Look for “instances” in the settings and add a Piped API URL, like https://pipedapi.kavin.rocks to watch videos from YouTube with Piped+Yattee.
Desktop
On Desktop, there is all the web clients as well as FreeTube (freetubeapp.io).
NOTE: FreeTube has an option to proxy everything or just the videos through Invidious to preserve privacy. It is recommended to enable this.
Web
For the web, there is Piped (github.com/teampiped/piped) and Invidious (invidious.io)
Android
On Android, there’s NewPipe and LibreTube which are well known by now.
iOS
On iOS, there’s the web frontends and Yattee (github.com/yattee/yattee).
Desktop
On Desktop, there is all the web clients as well as FreeTube (freetubeapp.io).
Just want to add to your yatte this source/instance this gives you a lot of instances to start with so you don’t need to add them manually.
https://r.yattee.stream/manifest-invidious-piped.json