There are many alternatives to Gqrx for Mac if you are looking for a replacement. The best Mac alternative is CubicSDR, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Gqrx and five of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Gqrx are SigDigger, SDR++, inspectrum and Linrad.
CubicSDR is a cross-platform Software-Defined Radio application which allows you to navigate the radio spectrum and demodulate any signals you might discover.
SigDigger is a Qt5 digital signal analyzer written in C/C++ that runs in GNU/Linux, macOS and Windows. SigDigger uses its own DSP library (sigutils) and a realtime signal analysis library (Suscan) to distribute load, and supports most SDR devices in the market thanks to SoapySDR.
SDR++ is an open source, cross platform, C++ based GUI general receiver program for various SDRs including the RTL-SDR. Since it's alpha release in mid 2020, it has undergone huge amount of development, and is quickly becoming the main program of choice for many users due to...
inspectrum is a tool for analysing captured signals, primarily from software-defined radio receivers.
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CubicSDR works well among many different distros on Linux.