iPhone Screenshots


AutoArp turns your iPhone (or iPod Touch) into a musical instrument that is halfway between a traditional auto-harp zither and an arpeggiated analogue-style synth. Select a chord and strum the laser "strings" with your fingers to create a retro, and yet futuristic, backing to your music.

AutoArp is FREE, with a fixed set of songs. Full functionality, including creating, editing and sharing songs, MIDI support and transposing can be unlocked via an in-app purchase (at the lowest price tier). This means you can try it for free and hear the results for yourself!

The synth engine features:
• square, pulse and sawtooth waveforms,
• attack and release envelope controls,
• a resonant low pass filter with cutoff and resonance controls,
• monophonic or polyphonic playback
• tremolo effect with LFO frequency and depth
• simple Echo effect

Up to 16 chords (12 on iPhone 4s and below) can be selected per 'song' and configured onto the playing buttons, allowing you to switch quickly between songs to load a new set of chords. Alternative bass notes can also be set for each chord. There are 22 chord types, ranging from major and minor to jazz chords like minor 11th and major 7th with a sharp 11th!

* BRAND NEW UI - new look and feel with retina support finally brings AutoArp into the 21st century, as well as an improved interface for editing songs and settings
* Audiobus support for inter-app audio (even on iOS 6), so you can wire AutoArp up to loads of other great FX, mixing and recording apps
* Improved audio engine, built using The Amazing Audio Engine (from A Tasty Pixel), with lower latency
* MIDI support, including hardware CoreMIDI-compatible interfaces, inter-app MIDI and even network MIDI (paid version only)
* Share songs with other AutoArp users via email (paid version only)
* Transpose playback +/- 6 semitones to play in any key (paid version only)

What’s New

Version 2.0.5

Support for Audiobus 2.x
Some minor iOS 7 tweaks

Ratings and Reviews

3.7 out of 5
7 Ratings

7 Ratings

Murdock Scott ,

A couple of requests...

I have been looking for a simple strum controller and I like this one more than many others I have found. Just a few things would really make it the exact thing I have been looking for. 1. Velocity mapped across the strings would add so much to the expressiveness of this instrument. 2. Being able to tap a string as well as strum would be helpful. 3. Universal support and being able to take advantage of the ipad for extra control features. 4. Sustain to be controlled by the chord buttons as an option, i.e. note off is sent when you lift all fingers from the chord buttons. And if I could have anything I wanted I would include a string editor that would let you build any kind of strum able instrument you could think of.

Joe Vanore ,

Awesome concept

The amount of customization options is impressing. My only complain is that when strumming the same chords multiple times, there's a very audible popping sound as notes get cut off.

Cincinnati Reviewer ,

Nearly Perfect

Simple, fun to play, and customizable in ways I actually care about! For .99, it's hard not to love this full-version app.

But I was a bit disappointed to find that you're not able to record directly in the app (instead I've turned on voice memo, gone back into the Autoharp app and wound up with a recording that reminds me of my days of recording with tape!).

It can also be frustrating to have to enter the chord you'd like without being able to preview its sound. This results in unnecessary flipping through screens. These small changes would make a huge difference-- perhaps in an update?

For now, truly enjoying what's already available here.


Drew Milloy
6.5 MB

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



Age Rating
Rated 4+
Copyright © Andrew Milloy 2011-2014
In-App Purchases
  1. Full functionality $0.99


  • Family Sharing

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

More By This Developer

You May Also Like