NanoVNA-App is, for me, the best PC program I have found for my NanoVNA V2 (SAA2).
I can view 3 plots or more at once. Most formats available in professional software are also available in NanoVNA-App. Scan rate is quick.
If it has anything lacking, it is the ability to define cal kit standards, which would be nice, especially, databased (Touchstone) standards.
I use Linux only, so I wanted to post a note of how to install it. The program works fine in WINE. No need to install drivers, the Linux kernel already has them. Notes:
Linux Mint 20.2 (Ubuntu 20.04 Focal) and PlayOnLinux V4.3.4-1 (POL)
Created a standard 32bit virtual drive in PlayOnLinux named: NanoVNA-App
Use wine version 6.18 or system (5.0-3) in POL wine config, either works fine.
Doesn't need Mono or Gecko. If offered to install, just cancel the warnings.
Must install dependency: gdiplus (Microsoft GDI+ Graphics Device Interface)
Windows version Windows 10 set in Wine Config
Run install executable: NanoVNA-App-Setup-v1.1.209-OD17.exe
(PlayOnLinux, install, install a non listed program, search and open NanoVNA-App-Setup-v1.1.209-OD17)
Set the com1 port, The NanoVNA V2 will map to ttyACM0 when plugged into Linux:
Use the wine registry editor in PlayOnLinux for the NanoVNA-App virtual drive:
Under: HKEY_LOCAL_MACHINE\Software\Wine\Ports
Create a new string value. Name it: com1 and set value to: /dev/ttyACM0
Can run NanoVNA-App from PlayOnLinux window or tell it to "Create a Shortcut" and it will place an icon on the deskop.