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Some of these apps exist, but none are as accurate as a ruler and two post-it notes with a pinhole.

If Apple opens up the depth sensor on the iPhone camera, such apps will be more accurate.

The trouble with do it yourself measurement of the distance between eyes is that it's done with eyes that need glasses, without wearing them. You need a second person or hardware.

I do it while wearing my contacts :)

In my case, my distance vision is bad, but a meter away is sharp without correction. In fact, I’ve never had a prescription that doesn’t f-up my near vision, so I had to do the measurement without glasses on.

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