You don’t need to own an RSP from SDRplay to use SDRuno. Those people who already have an RTL-SDR dongle,  can use our SDRuno software for free.   So can owners of many other SDRs which support an EXT/IO interface.  We’ve just released a new video guide to using the “SDRuno EXT/IO edition”:

Follow the link in the YouTube description to RadioforEveryone’s excellent guide to using SDRuno with other SDRs