Synthtastic is a free software synth for the iPad, iPhone and iPod touch that is designed to let you explore microtonal expression and alternative key layouts.

It’s based on Rob Fielding’s Mugician app, which had its last update last year. Fielding has open sourced the app since then.

At this point, developer Ryan Martinez has not documented in the App Store what is different about his version of Mugician and his site is a placeholder. As a result, it’s not clear whether he’s made any improvements to Mugician or if he has any future plans to develop it.

If you know anything about plans for Synthtastic, leave a comment!

Synthtastic is available now as a free download from the App Store.