Great but...
Since update to iOS 10 with iphone 6S alarm is on also at the weekend even if its disabled! Why? Needed to deinstall to cancel alarm!
Update on this:
Wrote mail and got response within a few hours and solved problem
1) delete the app
2) restart your device
3) re-download the app from App Store
4) open the app and go to FreakyAlarm Settings > Reset > Reschedule Alarms
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FreakyAlarm — Games & Barcodes, v3.1.5