The Roku app on Apple Watch allows you to control the Roku device by turning your smartwatch into a remote.

Roku has announced its official app for the Apple Watch, making it easier for users to control content from their wrists.
The Roku app on Apple Watch allows you to control the Roku device by turning your smartwatch into a remote. The circular crown on the Apple Watch controls the volume, the official blog notes.
To launch channels, tap on the watch screen. You can also use voice search incompatible Apple Watch models.
Additionally, the Roku app on the Apple Watch can be used to signal your Roku remote. (ANI)
The free #Roku app is now available right on your wrist.
— Roku (@Roku) November 8, 2019
Introducing the Roku app for @Apple Watch ➡️ https://t.co/FCjhAbG7aC pic.twitter.com/mSWvnkFL5u
Nobody gets it yet, but Apple is one of the most closed ecosystems of scale we have ever seen.
— Ophir Gottlieb (@OphirGottlieb) November 9, 2019
By allowing Roku on Watch OS, that's it, Apple is saying, "OK, Roku wins."
