App for star constellations on iphone?

[letseatgrandma]

My friend had a fab Google star app on her HTC phone that she showed me-you point your phone at the sky and it tells you what you can see. I can't seem to find it on the iphone. I've downloaded one called star chart, but that doesn't move as you move the phone like my friend's one does-is there something similar in the app store?

I've got Night sky on my I pad.

The Android one is Google Skymap but I don't know if there's an iphone version...

It maybe ''starwalk''

And also goskywatch planetarium. I have this for iPad, it's good :)

I have night sky on my iPhone.

Star Walk

I've got SkyView on iPhone and iPad. Brilliant