A must need application for Iphone?

In your opinion, what is the most essential app for Iphones? I'm quite curious.

Well there is a lot applications for iDevices - could you please specify what exactly you are going to use your phone mostly for?
It's hard to talk about essential apps without knowing the purpose of your phone.

I would recommend Tinder :D haha. i got some dates from tinder . funny :D

iMovie to edit video clips, and telegram. Not a fan of imessage, but telegram works well and is free.

Youtube of course! I mean it's clearly the most used app on my iPhone.

YouTube, Whatsapp, Instagram. That's a must need for me.

Guys from iosgods just released a new app, it's like those chinese apps (tutuapp, tweakbox) where you can get paid/cracked apps for free