Ever found yourself wondering whether two actors starred in a movie together or not? Or wondering whether two movies had an actor or two in common? As a frequent moviegoer, DVD watcher, or Netflix user, you might have even found yourself arguing with a friend on either circumstance. Well, with the recently released Commonly app, you need not wonder any longer.

Said to be the first of its kind in the App Store, Commonly lets you easily find out the common movies between two actors and the common cast between two movies. Now, you might be thinking, “But I can already do that with Google or, better yet, with IMDb’s ‘common’ search page!” Well, I hasten to add that the operative word here is “easily.” As pointed out by Commonly developer Incyc:

So you say you can open a few tabs in your browser and search for your movies and cast, and go back and forth comparing them? But that’s hard work! And although hard work never killed anyone, but why take the risk? Commonly can do the tedious work for you, and give you exactly what you want to know in an instant.

As mentioned, you can search both ways in Commonly: two people working together or common cast between two titles. Sporting a simple and intuitive interface, Commonly also lets you browse movie and cast info pages right from your searches.

Designed for iPhone and already optimized for iPhone 5, Commonly is available now in the App Store. It’s free of charge until Oct. 21, so download it now and set your persistent friend straight on that argument — the quick and easy way. Who knows? It might also help you win game after game of Six Degress of Kevin Bacon.