I also use ProScan Remote Scanner Over IP extensively for Windows clients both on and off my network and it works great. I have played with Web Server to be able control from my smart phone, but I found the audio to be out of sync with the display by around 10 seconds. What was on the display was real-time, but the audio was delayed. Do you experience this?
Yes, but when using web server, once you bring up the client screen in Chrome, there is a small box towards the lower right that allows you to adjust the delay of display data and metadata. I had to adjust the delay to 23 seconds, and once I did that things were perfect. I've been running happily for a week with that delay, no adjustments required (fortunately). I'm sure that the correct delay for everyone's individual situation will vary, but you might want to start with 23 seconds and tweak it from there.
The only real downside of the web server / chrome browser client arrangement, is that that delay requires a bit more patience when issuing commands. You have to leave a few seconds between button pushes so that they don't go through in the wrong sequence. The biggest challenge is in doing a channel hold. By the time you the "channel" button command executes, scanning has usually resumed. The solution here is to have tags on your main channels and use those where possible. It's not a perfect system but I'm happy with it overall, and there is no other way that I know of to have comprehensive monitoring and control of any scanner with a cell phone.
Siren was a good idea that is now a buggy app sorely in need of work, barely functioning on my iphone with hangs, freezes, ,and glitches. I have completely abandoned it for the web server / chrome browser client solution offered by Proscan when I want to listen "on the go", and sitting at work I have a third monitor that I use for entertainment, whether using Proscan RSOIP as a client, or sometimes streaming music.
Edit for clarity: RSOIP at work pictured below. The picture a few posts up is of the web server client on my iphone XS max...the display / metadata adjustment isn't seen there because I'm zoomed in, once you zoom out you will see it...it's just tiny.

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