I have used this for 5 months now and it is great. It would be nice if apps were developed for gray scale. Also you can create an iOS shortcut to toggle the color filters and place on the Home Screen to switch when you need to.
nostr:note1uav2ffu6nxxf7x5zh8sh6dgftszdwzn0z2wsd6a4kf7ajcgqa4aqfx8m93
nostr:note1uav2ffu6nxxf7x5zh8sh6dgftszdwzn0z2wsd6a4kf7ajcgqa4aqfx8m93