Frobulator is an experimental stereo modulated filter and delay effect. A combination of time and frequency domain processing gives it a different sound to a normal echo box. The special "FAIL" mode adds chaotic variations driven by an iterative map -- perfect for those times when your music is just too harmonious and listenable.

Apply Frobulator to live audio input, or connect with other music apps like GarageBand via Inter-App Audio or Audiobus. Frobulator supports Audiobus state saving and has IAA host transport controls.

NB: to avoid some nasty feedback, Frobulator is muted by default if you're using the built-in microphone and speakers on your iOS device. If you aren't getting any sound out, try pressing the mute button. (You can now disable the automatic muting entirely from the iOS Settings.)

What’s New

Version 1.2.1

Fixed crash when returning to host application via inter-app audio transport controls.

Ratings and Reviews

4.2 out of 5
6 Ratings

6 Ratings

Ronzlo ,

Like the other apps - outstanding!

To the Dev: you may not know it but you're making a lot of musicians' lives better - noticeably - every time they fire up their host DAW and one of your free plugs is there to make their tracks better - noticeably.

Thirdnail ,

Matthew Caldwell, ROCKS! No gimmicks, No Ads, No BS...

Matthew thank you for making outstanding effect apps that I can use with Cubasis or Garage Band...even though I paid for the extra effects in Cubasis, I still use any of the three free apps that Matthew made. I hope someday to get a contract or record deal, because I will give something back to M.C. Thanks for being a true developer and obviously a musician.

- Scotty S.

ZenLizard ,

Nothing Quite Like It

It is free, just freaking download it already and hear for yourself!

I have been testing this app in all kinds of configurations of IAA and AudioBus with assorted other apps. I have yet to encounter a problem.


Matthew Caldwell
19 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2015 Matthew Caldwell


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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