You should be upfront that this app is limited to 30 "articles" (or partial listens). Your app description makes it seem that the premium version adds only: "Subscribe to create your own playlist, download for offline listening, or browse through playlists that are tailored for your interest to discover new articles."

Premium is required beyond the 30? Listening to 5 seconds of an article counts as a play?

Overall really cool app though. Could see it branch out with an awesome feature set.