OttOrgan vs Trapezoid
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/ .
Trapezoid
This virtual instrument accurately simulates the sound and playability of a hammered dulcimer. It offers multiple tuning options, drag roll effects, and MIDI compatibility for a realistic musical experience. Designed for both beginners and experienced players, it fits right in your pocket.
- Authentic hammered dulcimer sound
- Standard and Michigan tunings
- Drag roll effects
- MIDI keyboard compatibility
- Velocity sensitive MIDI input
- Note name display
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Trapezoid is an amazing Hammered Dulcimer that can fit in your pocket. Written by an experienced Hammered Dulcimer player, this virtual dulcimer sounds and plays like the real thing! This app has the full range of a standard 12/11 style (9/9 style for 4:3 format iPads) instrument and supports both Standard and Michigan (octave) tunings. 12/11 means there are 12 bridges on the Treble (left) side of the instrument, 11 bridges on the Bass (right) side of the instrument. To play, just touch the strings on either side of the left (Treble) bridge or the left side of the right (Bass) bridge just like on the real instrument. To get repeated note "drag roll" effects, drag quickly horizontally across the strings. The sensitivity of the drag effect may be set on the settings screen. Touch the "?" to show the note names for the strings. Touch the "S" or "M" below the "?" to toggle between Standard and Michigan (octave) tuning. Touch the "Shhh" icon on the upper right corner to quiet all the strings. Touch the "i" to bring up the settings screen where you can set the overall volume, enable or disable the drag roll feature, and set the roll sensitivity for how far you need to drag to get the roll effect. The app also may be played from a MIDI keyboard connected to a hardware MIDI interface or other MIDI controller or MIDI file player apps. On the settings page you may select the MIDI channel number. When playing via MIDI, the app is velocity sensitive based on the velocity sent with the Note-on events. Lowest note is A2 (MIDI note 45). Range is full chromatic from A2 through D6. The app will respond to MIDI volume messages on the selected MIDI channel. To truly experience the full stereo spread of the instrument, plug in a set of headphones or amplified speakers. Playing Hint for Smaller Phone Users: On the smaller screen phones the strings are pretty close together. If you are having trouble hitting the notes you want, show the note names by touching the "?" and then, when playing touch directly on the note names for best playing accuracy. Audio samples of Wes Chappell's amazing dulcimer provided by Jesse Chappell from ThumbJam.com. The instrument was built by James Jones, from Bedford, VA. I have played and taught the Hammered Dulcimer for over 20 years. This app sounds and plays as close to the real instrument as I'm capable of doing on a touch screen. Be sure to visit the AppCordions.com website to watch the demo videos!
Screenshots
Verdict
The clearest difference is price: Trapezoid at $1.99 against OttOrgan's $9.00. Trapezoid also leads on update cadence (every 9 days vs every 5 months) and iOS requirement (10.0 vs 12.5.6). OttOrgan's advantage is device support (4 vs 2). On rating, review sentiment, ratings volume and ads 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 Trapezoid $1.99 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 Trapezoid. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
OttOrgan ships an update every 5 months, Trapezoid every 9 days. The most recent releases landed on October 17, 2026 and October 4, 2026 respectively.
| Parameter | OttOrgan | Trapezoid |
|---|---|---|
| Price | $9.00 | $1.99 — better |
| Rating | 5.0 (3 ratings) | 5.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 3 — better | 2 |
| Update frequency | Every 5 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPod |
| Requires iOS | 12.5.6 | 10.0 — better |
| Further details — not scored | ||
| Size | 340 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | Markus Sigg | Michael Eskin |
Customer experience
OttOrgan
Trapezoid
In-app purchases
OttOrgan
No in-app purchases
Trapezoid
No in-app purchases
Questions
Is OttOrgan free?
Is Trapezoid free?
Which has better reviews, OttOrgan or Trapezoid?
Do OttOrgan or Trapezoid have ads?
Which is updated more often, OttOrgan or Trapezoid?
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