Founded in 2016 QDevil’s mission is to develop and produce electronics and specialized components for quantum electronics research. We develop products in close collaboration with researchers, in particular at the University of Copenhagen. QDevil’s first and best established product is the 24-channel QFilter for reducing electron temperatures below 100 mK. It is built on a design developed and patented by Ferdinand Kuemmeth and his colleagues while working at Harvard University. The product portfolio additionally includes the QDAC, a 24- or 48-channel ultra-precision voltage source, the QBoard, a fast-exchange sample holder system, and the QBox, a 24-channel breakout box.