White

A white screen is arguably one of the simplest and least arbitrary things a screen-driving information system can present, together with Black (to be released soon).

Here are some implementations:

https://white.paulfrischknecht.com/ (a PWA)

https://play.google.com/store/apps/details?id=com.paulfrischknecht.white (a native Android app, listed in the Google Play App Store)

https://www.shadertoy.com/view/msfGDM (a glsl shader, listed in Shadertoy)

https://www.youtube.com/watch?v=QggJzZdIYPI (a YouTube video, not mine)

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