I remember advertisements for iSmell: https://en.wikipedia.org/wiki/Ismell https://en.wikipedia.org/wiki/Ismell I guess it never caught on (maybe the name :/)

I remember advertisements for iSmell: https://en.wikipedia.org/wiki/Ismell https://en.wikipedia.org/wiki/Ismell I guess it never caught on (maybe the name :/). Following the first link it sounds like there are a few more that have tried something similar.