Some terms where difficult for me to understand.
I need the app-extern "back" button to get out of the settings. Everywhere else in the app there are functions that allow me to switch back or find an exit. But in my opinion it's not a big problem. Just a litte flaw of the app.
All in all the app is easy to understand. The "moves" you have to make to use the app are quite familiar and like on every other smartphone. There are just two things, that seemed to be a problem for me.
It also would be more helpful to use one language (German or English) consequent in the whole app, than to mix up both languages. It also would help the app to appear more serious.
The last thing I recognized, is that I have to encrypt my chat to send a file. But if I'm allowed to chat without encryption, why can't I send a picture without encrypt my chat?
There were no errors in the app. Just the system crash when I created my account (see "visibly of system status"). But in the whole app I can't find any help- or support-page. Maybe it would be usefull to create such a page to give quick help to the user.
I didn't noticed any difficulties.
I think that the offered providers don't sound very confidental to uninformed users because of the unfamiliar names. There should be some more information about the providers (e.g. "xmmp.jp" or "neko.im").
For the "first use"-user the account settings are a little bit hard to understand. But I think this results out of missing knowledge in the domains internet and programming. For the user, who is a little more comfortable with this topics it should be no problem.
In all other aspects I don't see any differences for beginners and advanced users.
The design is quite modern and organized.
The only bug/error that happend to me was the system crash, when I created my account.
It would be very useful to have an short help- or support-page to give quick help to the user.
I used version 13.0.4 of ChatSecure for my analysis.