Well, here we are suffering a post-THON hangover, chugging a venti Starbucks and cursing out all of our professors who even considered assigning work this week. As you annoyingly slurp out those precious last drops of caffeine, you already begin considering when you should get another cup. But when is that exactly? It doesn’t seem to be keeping you awake right now, but when you’re sitting on StumbleUpon at 3a.m. later tonight, you will regret that third cup in retrospect.

Luckily, a Penn State scientist (who probably read my What Your Caffeine Says About You post) created the “Caffeine Zone” app to solve this problem. According to Businessweek, “You enter how much coffee or tea you’ve had, when you had it, and how quickly you drank it, then the app sends you an alert when you might need another cup to keep you sharp. It also warns you when the coffee you’re about to have might keep you up at night.” Neat!

The actual app only runs you $0.99, but there is also a “lite” version for all you chumps who don’t wanna throw down a dollar.