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Re:Show HN: Grayscale the Web – A Chrome extension to help a... by geoffpado on Tuesday May 22, 2018 @09:40PM (#17130925)
iOS does have a red monochrome option! Settings > General > Accessibility > Display Accommodations > Color Filters > Color Tint

Not the easiest to find, but it's there for people who need/want it.

Re:Show HN: Grayscale the Web – A Chrome extension to help a... by Fnoord on Wednesday May 23, 2018 @03:42PM (#17137471)
> (in case you need to finish that paper at 2 am but don't want to keep your roommates awake).

Like iOS, macOS has native Night Shift mode as well. Or you can use F.lux

Re:Show HN: Grayscale the Web – A Chrome extension to help a... by killjoywashere on Thursday May 24, 2018 @12:10AM (#17141023)
Not the same. Nocturne turns white black and black red.

But have an upvote for the suggestion!