About Universal SDR
Universal SDR is closed-source software for software-defined radio on Windows: a free app, with an optional one-time Pro upgrade from version 1.0.
Universal SDR (universalsdr.com) is a free Windows app for software-defined radio receivers. Plug in an RTL-SDR, HackRF, LimeSDR or another SDR, click the waterfall to tune, and hear or decode the signals you are allowed to receive: FM and AM, aircraft (ADS-B, ACARS), ships (AIS), weather-satellite pictures, digital voice (DMR, D-STAR, YSF, NXDN, P25), pagers, amateur radio modes such as FT8, DAB+ digital radio and hundreds of 433 MHz sensors. It only receives unless you turn transmitting on. Early access is a free alpha program you join with an email address; from version 1.0 the free app will need no account.
What kind of software it is
Universal SDR is closed-source commercial software for Windows. The components it builds on are listed, with their licences, in the notices that come with the app.
The app is free. During early access each build is dated and for members of the alpha program, with every Pro feature unlocked. From version 1.0 the free app will not expire.