Everyone who plays guitar knows the need to keep it in tune. Peterson is famous for their strobe tuners and now they've brought that to the iPhone and iPod Touch with the iStroboSoft app. The real-time strobe display lets you reach 1/10 cent accuracy so your guitar will sound awesome. If you're tuning on an iPad you'll want the iStroboSoft HD app. Both are selling for $9.99 in the App Store.

iStroboSoft - http://bit.ly/XRQiND

iStroboSoft HD - http://bit.ly/151yCVR