I'm not sure Shinobi has native mobile apps. I think it just has a web interface that you open in a browser (which can be plenty powerful enough if they built it well).
I've been using
Blue Iris for ten years now and I'm still very happy with it. At this point you could not pay me to switch to something else, and I recommend Blue Iris with full confidence to anyone who needs security camera recording software. It is hardly any more expensive than it was ten years ago, and it is way more powerful than it was back then and keeps getting better.
I've sampled other VMS products before (only ones with free versions) but none were good enough to make me jump ship. I even tried the free version of Milestone XProtect in late 2017, around the time I was getting UI3 (Blue Iris web interface) into its beta testing phase. I had a need for software to run just one camera in my office, and it was the perfect excuse to see what a very well funded high-end VMS product was like. And I wanted to see how my UI3 project stood up against a major player in the VMS arena.
I was not impressed. Xprotect was massive bloatware. And more importantly, I could not get it working with my camera. So I ditched it, installed Blue Iris, and everything was fine in a matter of minutes.