1. I gave it 4 stars because there is room for improvement in the user interface; fine control of frequency and bandwidth can be difficult using the touchscreen, although easily adjusted precisely by direct entry of the values.
2. I have watched the instructional videos on how to work the app but for $9 for the pro key , a brief set of instuctions on the apps home page would be expected.I had this application installed on my LG Android tablet for years, but I never fully learned it.
3. doesn't work on every device but it works awesome on my Samsung Galaxy J7 Crown phone, listening to FM on it now.
4. I purchased the "SDR Touch Key" but honestly would like to show the developer more gratitude than that! Thank you for bringing this to my phone! The software has some bugs yes but is still the most functional option for now.
5. My biggest complaint is there is no good way to fine tune a signal, yes there is the zoom funtion but if I zoom in too close and try to drag the tuning bar the whole screen moves.
6. I have a newer nextbook that it doesn't work on but another cheap tablet it works on albeit a little choppy.
7. It works just fine when the phone screen and the app is in focus.
8. Therefor deserving 5 stars for being the best option.It freaking works, every time with any of my SDR dongles on any of my droids, regardless of size make or version.
9. A paid app should be polished and bug free.Great app, doesn't work well on the latest Android - disconnects at random.
10. SDR is really served by having more screen space than a phone or even a tablet.
11. It also works with rtl_tcp servers which is how I use it over my WiFi from my router using OpenWrt is running the server with my radio connected to the USB port.