OttOrgan vs JAX SR
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OttOrgan
This application allows users to play a specific house organ sample set using a MIDI keyboard and pedal on iOS or macOS devices. It provides access to a unique five-rank manual and attached pedal with a 16' subbass.
- Play Ott-Orgel sample set
- Connect MIDI keyboard
- Connect MIDI pedal
- iOS and macOS support
- House organ simulation
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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 http://orgel.datzko.ch/main.EN.html. For more information, please consult the app support page http://polaron.de/OttOrgan/ , the Napo documentation at http://polaron.de/Napo/ and in particular the Napo user manual at http://polaron.de/Napo/manual . For hearing sound examples of the app, please visit the support page http://polaron.de/OttOrgan/ .
JAX SR
This audio effect app allows selective frequency range processing for modulation effects. It offers a classic phaser with MIDI control and dynamic mix adjustment, preventing negative side effects from full-range processing. It requires a host application to function.
- Selective frequency range processing
- Classic phaser modulation
- Optional MIDI control
- Dynamic mix adjustment
- Universal app for Apple devices
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The manual is here : https://audio.digitster.com/wp-content/uploads/2024/05/JAX-SR-Phaser-Manual.pdf The JAX SR Series are AudioUnits (AUv3), which allow to select a frequency range for effect processing. This one provides a classic phaser modulation effect with optional direct MIDI control assignment to the parameters. If (especially) modulation effects are applied to the entire frequency range, this usually will introduce negative side effects. The JAX [SR] Series allow a selective frequency range and dynamic adjustment of the mix easily. More information can be found on the product website at: https://audio.digitster.com/ Please note, that AudioUnits (AUv3) require a supporting host application to perform. This build (like all our latest releases) is truly 'universal', meaning, the audio unit is available for: - MacOS (Apple Silicon) - iOS (all actual iPhones) - iPadOS (all actual iPads) - visionOS (Apple Vision Pro) Requirements: MacOS 10.15++ iOS 14.0++
Screenshots
Verdict
The clearest difference is update cadence: JAX SR at every 4 weeks against OttOrgan's every 5 months. JAX SR also leads on price ($6.99 vs $9.00). OttOrgan's advantage is ratings volume (3 vs 1) and iOS requirement (12.5.6 vs 14.0). On rating, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
OttOrgan costs $9.00 and JAX SR $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for OttOrgan against 5.0 for JAX SR. Both are backed by a comparable volume of ratings — 3 and 1 respectively.
OttOrgan ships an update every 5 months, JAX SR every 4 weeks. The most recent releases landed on October 26, 2026 and October 19, 2026 respectively.
| Parameter | OttOrgan | JAX SR |
|---|---|---|
| Price | $9.00 | $6.99 — better |
| Rating | 5.0 (3 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 5 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 12.5.6 — better | 14.0 |
| Further details — not scored | ||
| Size | 340 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | Markus Sigg | Jens Guell |
Customer experience
OttOrgan
JAX SR
In-app purchases
OttOrgan
No in-app purchases
JAX SR
No in-app purchases
Questions
Is OttOrgan free?
Is JAX SR free?
Which has better reviews, OttOrgan or JAX SR?
Do OttOrgan or JAX SR have ads?
Which is updated more often, OttOrgan or JAX SR?
Other comparisons
