If only...
Cannot change the default chime sound even after watching the required 2 ads to do so... tried 3 times.
Not enough ratings yet to assess 30minTimer.
30minTimer: Hourly Chime appears legitimate, with a few gaps. AppsHunter Legitimacy Score for 30minTimer is 65/100.
Based on 65 of 100 points across 7 verification signals from App Store and developer data.