OttOrgan lets you play the Ott-Orgel sample set of Christian Datzko on a MIDI keyboard and a MIDI pedal attached to your iOS or macOS device. The Ott organ is a house organ with five ranks at one manual and an attached pedal with a 16' subbass. If you would like to use the sample set with other software, you can get it at

For more information, please consult the app support page , the Napo documentation at and in particular the Napo user manual at .

For hearing sound examples of the app, please visit the support page .

What’s New

Version 7.1

Bluetooth MIDI and Network MIDI do now work.

Ratings and Reviews

Arianna Cunningham ,

More Stops!

This Organ App is awesome! It’s very cool how you added the 16’ stop!

Can you please add a 32’ and a 64’ Stop to the pedal for the Updated Version?

App Privacy

The developer, Markus Sigg, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

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

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