BEST alarm clock app for iPhone? - 1

I start back school tomorrow and I need to be up by 6:30 and unfortunately, I do not have a regular alarm clock. I already did a test this morning with the stock alarm app on my iPhone and it did not wake me up at all. I'm a pretty heavy sleeper so I need something loud that will wake me up on time. Preferably it should be free, but I do not mind paying for a really good app. So I will take any suggestions! Thank you in advance

Added (1). I forgot to mention but it must be an app that works when the app is closed

Added (2). I forgot to mention but it must be an app that works when the app is closed

Hi
I would like to mention here few very good alarm apps
-Rise Alarm Clock (free) this app was picked as app of the week in Apple store. A very useful app I must say.
- Wake (paid)
-Wake N Shake Alarm Clock (Paid)
-Step Out! Alarm Clock (paid)
-Rise Alarm Clock
-Shredder Alarm Clock (Paid)
-Nightstand Central Free
-Rise

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