OB-Xd is based on the Oberheim OB-X. It attempts to recreate its sound and behavior, but as the original was very limited in some important ways, a number of things were added or altered to the original design.

OB-Xd was designed to sound as good and as rich as the original. It implements micro random detuning. Also, like many synths of the OB-X's generation, the OB-Xd has no internal effects so its sounds and textures can be greatly enhanced by the use of additional processing like chorus, reverb, delay, etc.

Standalone app requires MIDI keyboard.

What’s New

Version 1.5

Added GUI window scrolling using wood panes in AUv3.
Fixed AUv3 window scroll conflict with potentiometers.

Ratings and Reviews

4.6 out of 5
14 Ratings

14 Ratings

Enrique Raphaël Page Pérez ,

Thanks for the most recent update!

The new scrollable UI is far superior to what we had before.

I haven’t had the chance to fully get dirty with this synth but it looks promising, is not too expensive and is AUV3, that’s mostly enough for me to spend a few bucks on an iOS synth.

The little I’ve used it, I’ve enjoyed the sound too! Now that the controls are far better I will use it a lot more (I’m an iPhone user and the previous UI was a little too tiny to be conveniently set). It would be a blessing if we could also zoom in a little bit, enabling us to use the AUV3 in portrait mode on iPhone on apps such as AUM. This would be massive!

A little heads up about a bug: turning a knob Downwards doesn’t seem to affect the UI Window however turning it upwards does and acts as a drag on the interface. Workaround: touch screen with another finger to keep screen position locked while changing knobs.

Hopefully this little detail can be fixed?

I can’t see a keyboard on the regular app, but I only use AUV3 so to me this is irrelevant (although it did use to have before if I recall correctly, dev it might be a good idea to not remove it from the standalone app (in case you did, I’m not sure)).

SpaceCadet-528hz ,

This App is AMAZING!!!

I have been wishing (sometimes vocally but mostly silently) for an OB-X(a) emulator to make it's way to iOS since 2013 and it's actually here and it's even an AUv3 (AudioUnit) plug on both iPad and iPhone. It sounds amazing and works beautifully. I am especially pleased the developer made the UI scrollable in-host. Thank you!

TheRealDutchee ,

Great new update

Great sounding and fun synth.

The scalable fullscreen UI and the new preset browser are definitely a big improvement. Thanks for the update! 👍


Jorge Reales
14.5 MB

Requires iOS 11.0 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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