Comparison

Combo Organ Model V vs Trapezoid

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Combo Organ Model V

Experience the authentic sound of 60s transistor organs, famously used in psychedelic rock. This app offers a realistic sound engine with multiple instrument tones and built-in effects like reverb and vibrato. It's compatible with various audio routing technologies for seamless integration into your music production workflow.

Highlights
  • Realistic 60s transistor organ sound
  • Multiple instrument tones (Flute, Bright, Brass, Mellow)
  • Built-in spring reverb effect
  • Adjustable vibrato effect
  • Audiobus 3 & Audio Unit compatible
  • Core MIDI and MIDI over Bluetooth LE compatible
  • Scrollable and dual keyboard options
Features
Read full description

Combo Organ had a strong impact on rock, becoming a trademark sound of the psychedelic rock bands. You will be surprised at the real sound generated from this App and LIGHT YOUR FIRE! It has been featured on the following songs & albums, - "Lucy in the Sky with Diamonds” by The Beatles - "Light My Fire" by The Doors - "Born To Be Wild" by Steppenwolf - "House of The Rising Sun" by The Animals - "Good Vibrations" by The Beach Boys - "I’m A Believer" by The Monkees - "In-A-Gadda-Da-Vida" by Iron Butterfly - "Astronomy Domine" by Pink Floyd and much more.... - Optimized appearance on iPhone X, XR, XS/XS Max - Compatible with Audiobus 3 & Audio Unit - Core MIDI and MIDI over Bluetooth LE compatible - Supports Audiobus and Inter-App Audio (requires iOS 7 or later) - Scrollable Keyboard & dual Keyboards(Only iPad) with switchable key width - Pre-loaded with 4 instruments including FLUTE, BRIGHT, BRASS, MELLOW - BASS tone is assigned on lowest octave keys - Built-in Reverb that simulates a spring reverb - Vibrato that can adjust the rate and depth

About

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.

Highlights
  • Authentic hammered dulcimer sound
  • Standard and Michigan tunings
  • Drag roll effects
  • MIDI keyboard compatibility
  • Velocity sensitive MIDI input
  • Note name display
Features
Currently charting
Read full description

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

Combo Organ Model V4 screens
Trapezoid3 screens

Verdict

The call

The clearest difference is review sentiment: Trapezoid at 100% against Combo Organ Model V's 58%. Trapezoid also leads on rating (5.0 vs 4.4) and update cadence (every 9 days vs every 4 months). Combo Organ Model V's advantage is ratings volume (18 vs 2). On ads, in-app purchases, monetization model and device support 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

CostPrice · In-app purchases · Ads · Monetization

Combo Organ Model V costs $3.99 and Trapezoid $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Trapezoid holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Combo Organ Model V has 18 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 58% of Combo Organ Model V's written reviews are positive against 100% of Trapezoid's.

UpkeepUpdate frequency

Combo Organ Model V ships an update every 4 months, Trapezoid every 9 days. Both last shipped on October 24, 2026.

Scorecard7 real differences · 4 level
Combo Organ Model V versus Trapezoid: the parameters behind the verdict, then further details
ParameterCombo Organ Model VTrapezoid
Price$3.99$1.99 — better
Rating4.4 (18 ratings)5.0 (2 ratings) — better
Positive reviews57.9% of reviews100.0% of reviews — better
Number of ratings18 — better2
Update frequencyEvery 4 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank—#191 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS14.010.0 — better
Further details — not scored
Size31 MB46 MB
Age rating4+4+
Developerinsideout ltd.Michael Eskin

Customer experience

Combo Organ Model V

All ratings19 ratings
Positive84.2%
Neutral5.3%
Negative10.5%
Written reviews19 reviews
Positive57.9%
Neutral15.8%
Negative26.3%

Trapezoid

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Combo Organ Model V

No in-app purchases

None

Trapezoid

No in-app purchases

Questions

Is Combo Organ Model V free?
Combo Organ Model V costs $3.99, with no in-app purchases.
Is Trapezoid free?
Trapezoid costs $1.99, with no in-app purchases.
Which has better reviews, Combo Organ Model V or Trapezoid?
Trapezoid is rated higher. Combo Organ Model V averages 4.4 out of 5 from 18 ratings, while Trapezoid averages 5.0 from 2 ratings.
Do Combo Organ Model V or Trapezoid have ads?
Neither Combo Organ Model V nor Trapezoid shows ads.
Which is updated more often, Combo Organ Model V or Trapezoid?
Combo Organ Model V ships an update every 4 months, and Trapezoid every 9 days. Most recently, Combo Organ Model V was updated on October 24, 2026 and Trapezoid on October 24, 2026.

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