Crittex started as a project to solve a specific problem: how do you get pests out of a place without leaving anything behind? No bodies. No poison residue. No traps under the sink.
The cabin had mice in the walls. The kind you hear at 3 a.m. that you can't unhear. The traps the owner left were full. The exterminator quoted $400. The dog kept finding pellets in the basement.
We borrowed a piezoelectric speaker from a friend's workshop, wired it to a 9V battery, pointed it at the wall — and over three nights, the scratching stopped. Not killed. Gone. The mice had decided this place wasn't worth it.
The next two years went into making that experiment something we could put on a shelf. Crittex is what we ended up with: cordless, USB-C, tuned to one species at a time, and quiet enough that the dog keeps sleeping through it.
Snap traps and glue boards leave you with carcasses, blood, and the smell that follows. Crittex makes that part unnecessary.
Anything aerosolized in your kitchen ends up in your lungs and on your countertops. We refused to ship that.
Half the "ultrasonic" devices on the market are loud enough to torture a dog. Ours is tuned tight: 22–55 kHz, irregular pulse, low enough SPL that pets don't notice.
Every firmware cycle gets run through a panel of real homes with documented infestations. We measure activity drop on day 1, 7, 14, 21. We ship the next revision when the curve is flatter than the last.
