Ipad apps for metering

I have been searching around, but didn’t find what I am looking for.
Does anybody who knows his way in ipad land, knows about apps for metering. especially loudness and peak meters and a spectrum analyser?

The only thing I miss from my computer since I went completely computerless, is this… I used youlean meter and voxengo span a lot for checking volumes, peaks and frequencies when I go mix everything a bit in all the boxes… I know, use my ears, but I found after a lot of time trying to mix I get better results when I have a bit of visual feedback on what’s actually going on.

I have the analog heat as last in my chain, which can connect to the ipad as class compliant usb interface. It would be so nice to just have the ipad in stead of a computer for this purpose.