Here are some possible reasons for SplashShopper iOS WiFi sync not working:
1. The desktop app is not running, or it is in a locked state. Login to the SplashShopper Desktop app, and make sure no additional windows are open, just the main window.
2. The SplashShopper Desktop is not allowed through your firewall software. Make sure it is allowed.
OR, temporarily disable any firewall and antivirus software completely (including any OS built-in ones) and see WiFi sync works fine then.
3. The desktop computer and mobile device are not on the same WiFi network. Make sure WiFi is turned on on both devices and they are connected to the same network.
If your WiFi router has both a named and a Guest network, please make sure the iOS device is connected to the named network.
4. There is a VPN, virtual machine, or other network interface active. This can cause SplashShopper Desktop to latch onto the wrong network interface. Disable any other interfaces besides the WiFi network or the Ethernet if that is what the desktop computer is connecting to.
Please try exiting both apps, and restarting your computer and your mobile device to see if that clears it up.
Please also try power-cycling your WiFi router/modem - disconnect from AC power for 10-15 seconds.