I'm working on a system for data annotation that might support apps of that nature.

I'm focusing on simpler datasets for now, I want people to be able to annotate a paper restaurant menu with notes about allergens in a way that other people with those allergens can summon those annotations and steer clear--all without participation from the restaurant. Like an augmented reality layer for text.

I hope it grows up into something that would let you ask:

> How trusted is this line of code, and by whom?