Who is behind Monero Price Ticker for Android?
What currencies are supported?
What permissions does the app require
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As already commented before, answers are on the Google Play store page you linked to, e.g.:
There's a contact e-mail address on the Google Play Store page: firstname.lastname@example.org.
I don't know what permissions it requires, I have no Android device at my disposal to test. Maybe get in touch with the author.