Timely Alarm Clock is a free app, but it includes a number of add-on premium features that can be unlocked both through an in-app purchase, or through spamming your friends on your favorite social network. The UI is lovely, with a heavily customizable color palette. The alarm clock app itself is easy to set, and comes with a few sounds, as well as a cool "Smart Rise" feature, which will pulse music softly in the 30 minutes leading up to your alarm time to try to catch you when you're coming out of a sleep cycle.
One of the best features is that the app will sync your alarms across your devices; and, the app is optimized for all devices running Android 4.0.3 and up, so it will look good on your smartphone all the way to your 10-inch tablet. There is a widget and Google Now integration as well.
You will get access to all of the premium features for free for 5 days, and after that you can purchase the full unlock bundle, which includes ad-removal, more themes, more sounds, the syncing option and more, for $2.99. Or, you can unlock only the things you want, like no-ads for 99 cents. And, of course, as we mentioned, you can unlock things by referring more friends to the app using your referral code (which we will not be doing here, so as not to abuse our power).
It really is a lovely app, and definitely worth a look. You can download Timely Alarm Clock for free.
Download: Timely Alarm Clock