Hello,
Thanks for your post.
Before I say anything here, I do want to mention that AmpliTube 4 (Mac/PC) is included with the iRig Stomp I/O unit's registration. The AmpliTube CS (Free) app will also include the AmpliTube (Paid) app's gear upon iRig Stomp I/O registration.
Full list of included software with the iRig Stomp I/ONow, to clarify, while both versions work great on-the-go, the AmpliTube 4 Mac/PC software is designed more for the studio player with full control of every aspect of the selected rig. The iOS version is designed for the mobile player to give you all of the tools needed in a compacted form for the iOS platform. Of course the AmpliTube 4 Mac/PC software is a bit more detailed than AmpliTube iOS, but don't get me wrong, these are both powerful beasts with their own advantages. The best way to see these would be to use the free versions we offer to all IK users.
Download AmpliTube CS for iPhone app hereDownload AmpliTube CS for iPad app hereDownload AmpliTube 4 CS for Mac/PC hereNote* To use the AmpliTube 4 CS download link above, make sure to log into your IK account.