[QUESTION] What are the most essential iPhone/iOS apps to get?

[UKAAtlantis]

I have an iPhone 4s, got 40$ itunes card.
Now i have 10$ left, what apps should I get?

I would prefer some Utility apps but games are just as good.

 

[kill dank]

They have this one app where you can steam in HD video from your phone to a website.. Color and everything, it's pretty cool but costs money.