I have a problem with StackX app on my Samsung Galaxy 4 phone (Android 4.3). I'm logging to StackExchange in general, and StackOferflow in particular, using my Google ID. The app does not recognize my id as valid existing ID.

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I did not find any other way to contact the developer besides StackApps and I do not believe that rating page is an appropriate venue for tech support.

1. Does anybody else have such problem?

2. This app claims to be able to post comments (not just to view stuff). Are there other Android apps with such capabilities?