If anyone is interested in this app, it is best to register a new account to test it.
For testing the app, you don't have to use your log in credential since the app is "Read Only" but through this app, the app owner may steal your data. Be aware.
For one, they don't need your password enter the account. If they get signed-in cookies and codes from your mobile browser it's enough to compromise the account.
Changing the password does require knowing the previous one or having access to the email as well though.
I'd say that nobody should trust an third party tools for bitcointalk unless the binaries are confirmed to bee built from open source code.
Until the forum can support technolgy for secure sign-in via third party services (f.e. Oauth) such apps aren't secure. Hopefully we'll see a feature for that in the
new forum software.