iShred is described as 'sends the highest quality guitar sounds through a bank of crazily configurable stomp box effects, rendering the result into screaming, distorted, wailing, looping, feedback-fueled audible gold!' and is an app in the Audio & Music category. There are eight alternatives to iShred for a variety of platforms, including iPhone, Mac, iPad, Android and Windows. The best alternative is Guitar Pro. It's not free, so if you're looking for a free alternative, you could try Power Tab Editor or alphaTab. Other great apps like iShred are Real Guitar (Freemium), TabToolkit (Paid), Tabular (Paid) and Awesome Guitar (Freemium).
Guitar Pro is first and foremost a program designed to edit tablatures for guitar, bass, and other fretted instruments from 4 to 8 strings. Its great ease of use and the success of its specific file format have made it a program used by guitarists worldwide.
Power Tab Editor is a free tablature authoring tool created by Brad Larsen for Windows. It is used to create guitar, bass and ukulele tablature scores, among many others. The current version uses the *.ptb file format.
alphaTab is a cross platform music notation and guitar tablature rendering library. You can use alphaTab within your own website or application to load music sheets from files like Guitar Pro or use the built in markup named alphaTex.
TabToolkit for iPad, iPhone and iPod touch is an incredibly powerful music notation viewer with multi-track audio playback. The app includes an audio synthesis engine that enables you to listen to and control the audio for all instrument tracks individually.
Tabular is a brand new tablature editor that lets you read and write music for guitar, bass, drums and much more. It's the best way to learn new songs, write your own songs and run through practice exercises for nearly any kind of stringed instrument or drum kit.