[Pfhortune]

If you're like me and want an open or non-google-play alternative to these, this is available on F-Droid: https://f-droid.org/en/packages/dev.davidv.motionsickness/

I can't vouch for it (yet) but am going to give it a try!

[jlv2]

This one works well. Small, simple, no ads, open source.