The KunKun, Japanese for “sniff sniff”, is a bizarre device developed by Japanese corporation Konika Minolta that detects bodily odors like smelly feet or underarm sweat and notifies the user about them via a smartphone app.
So, yeah, the days of smelling your own armpits when nobody’s watching to see if they stink are over, thanks to modern technology. Now you can just wear the KunKun everywhere you go and find out when you’re starting to stink just by checking your phone. It’s small enough to fit in a coat pocket, so no one will ever know you’re carrying it, and features sensors that pick up specific chemicals associated with three types of bodily odors. It can detect ammonia and isovaleric acid, chemicals known to produce that nasty sweaty locker-room smell, but also 2-nonenal, which is associated with old age and diacetyl, a controversial organic compound that makes yo smell like “rancid cooking oil”.