What's the best app on your iPhone/IPod/IPad?

[Abbey]

I have an iPod and iPad. I'm getting an iPhone in about march so I seriously need to put more apps on these things. I have all the social networking sites (ig, twitter,fb ect) Now I just need like game apps. I also have loads of music. My favorite singer is nickiminaj )
BQ: Who's your favourite singer?
BBQ: What's your favorite app on your iPhone/iPad/iPod?

I'm 13 btw. Best answer = 10 points:3

[Flacko]

Period tracker

[tilly]

hill race climb,temple run

[Beastly Iguana]

I'll just list eveything I have:

Modern Combat 3
N.O.V.A 3
Gangstar Rio
Zombieville USA 2
COD: WAW Zombies
Call of Mini: Zombies
Celtic Heroes
Metalstorm
Star warfare: Alien Invasion
Battle Bears Royale
Trigger Fist
Lunacraft
Guerrilla Bob
Highway Rider
Zombie Highway
Eden
Temple Run
Six-Guns
hacx
Cube
Eternity Warriors 2
Battleship Craft
Wolfenstein 3D
CHAOS
Dead Trigger
Junk Jack
Tom Clancy's Rainbow Six
Doom
Draw Something
Gunslugs