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The optics on this seem to indicate that it is just a lateral flow test of some kind.

It's not even different. Instead of having to interpret a couple lines you have software interpret the strip and tell you over bt on your phone. So much tech for so little.

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For an app that displays positive or negative, wouldn't it be cheaper/easier to use image processing to detect lines on the test?

Some tests do that but then you end up with a limited list of phones where the camera has been qualified. Better to go all the way to an eye-readable test.

In the Lucira test is a bit more justifiable it's a full molecular test, with built in controls, better accuracy than lateral flow. The optics is pretty neat too:

https://aseq.substack.com/p/inside-the-lucira-check-it-covid

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