I don't think  you would  actually  need any special apps to stay secure on the space and just as other users have also told you to be very careful  in quest of an app that ensure security  because you might end up being a prey which im very sure you wouldn't want and there was a thread about getting a cyber-security course  to hold bitcoin  or as a bitcoin  holder and I believe you also saw the thread but I don't think any of these are actually necessarily  and what truly matters is that you are using a good wallet and not storing coins on exchanges and so try as much as possible  not to click on random links and you're good to go.

Just use a good wallet and get your seedohrasr backed up and that just do the tricks rather than wanting to install  any app for that as we can't  even trust those apps.