So any product relying on the Topping Tune app for full functionality is probably not right for you at the moment. It takes time and money to develop software and Topping is only a small company, so I'm not surprised that they are initially focusing on a version of the app for one OS. You could try messaging them and asking what their plans are for supporting other OSes.
I did back in November/December and basically the response was eventually, yes.
I was excited about being able to apply some form of DSP on my desktop system, but when I found out that the EQ function on D50 III is (for all intents and purposes) only for PC, and only allows for one EQ profile, I chose to forego that feature for now. I'm hoping the DX5 II allows for multiple EQ profiles, then I can have one for my headphones, and my speakers. If it doesn't, then I will stick with what I have for the time being.