And then why CoinOS is best for iPhone is because you can launch it in a web browser, but of course the "Add to Homescreen" doesn't do anything useful (it doesn't save a login) so it doesn't bother.
Let me tell you that on Android you can do the same, you use the "add to homescreen" or "install application" option and it works perfectly.
You can come and go without any problem, the session remains open, and when you open it, it asks for the PIN code.
I use it in the Brave browser and it works very well.
Bravebrowser and it works very well.