An effect instrument anyone can play - sonic anarchy in the palm of your hand.

iOS Mars: "Barely controlled chaos“, "sonic extremes“, "well suited for live use“

Music App Blog: "if you like the occasional dose of sonic mayhem, then this is an app that will let you make it"

WretchUp is the sonic instrument from the imagination of Mouse on Mars Instruments. Used by the duo in their live performances, it's a playable effect inspired by analog hardware. Sing into it, speak into it, plug in an instrument, sample sounds, and then make sonic mayhem.

It's been tested in Mouse on Mars' live shows and used in studio albums. But now it's available to anyone - whether you're a musician wanting to create unique sounds or you just want to make some wild noises and frighten friends and enemies.


- Pitch-shifted delay with feedback and filter
- Unique controls, designed to be used in live performance and tested onstage
- Play with gestures, even without looking closely at the screen
- Record vocals or instruments from the built-in mic or another input
- Sample loops and change their speed
- Adjust the feedback loop, pitch, and filter for unique sounds
- Make inputs by holding down your finger, or lock input for continuous sampling
- Inter-App-Audio supported
- Audiobus supported

Features artwork by Rupert Smyth. Pure Data-based, open source patch created by Florian Grote and Peter Kirn with Mouse on Mars. App design by Oliver Greschke. Powered by free and open source software libpd.

Note: like all mic-based effects, you need to enable microphone input. If you accidentally did not allow mic input, you can allow later via: Device settings, WretchUp, Data settings, Microphone, allow mic input.

What’s New

Version 1.5

- iPad/Universal version

Ratings and Reviews

2.4 out of 5
5 Ratings

5 Ratings

djAlpad ,

Wreck your noise!

This thing is pure evil.. Very crazy sound modulator.. Unlike anything else.

Still having issues with stability and the looper, but maybe it will get fixed

andersoneast ,

Psychedelic and Frightening

A brilliantly simple interface with a deep capacity for sonic mayhem and a looper that lets you play with time, frequencies and feedback.

Gregor E ,

Love this app!

I just got this app and in the first 5 minutes it was really fun. I am a big fan of Mouse on Mars. Good job!


MoMinstruments GbR
13.9 MB

Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

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

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