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In (iOS && iPhone<9), you can toggle this filter with the triple click trick. In Settings > General > Accessibility > Accessibility Shortcut, select Color Filters, then triple click the home button.

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Oh that's cool! going to add that to the iphone part of the website!

The same can be done on Android (Lollipop and above).

How do you do it in Android?

Settings > Accessibility > Direct Access > Grayscale (Tested on Lollipop - may vary on later versions)

I have a fully updated Nexus - if you search Settings for "gray" you get no results. No "direct access" options under Accessibility. Seems like they may have removed it since 7. They do have some color-blind color correction options, but grayscale wasn't something I could find.

ETA: Ah on the "Go gray" page they describe the steps, including enabling Developer Mode first.

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