# Model 15 Modular Synthesizer vs iOptigan

The clearest difference is price: iOptigan at $5.99 against Model 15 Modular Synthesizer's $29.99. iOptigan also leads on chart position (#116 vs unranked) and iOS requirement (8.0 vs 12.4). Model 15 Modular Synthesizer's advantage is ratings volume (898 vs 114). On rating, review sentiment, ads and in-app purchases there is nothing between them.

Model 15 Modular Synthesizer costs $29.99 and iOptigan $5.99 up front. Model 15 Modular Synthesizer sells 11 one-off in-app purchases and iOptigan sells 16 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.9 for Model 15 Modular Synthesizer against 4.8 for iOptigan. That said, the two scores are not equally well evidenced: Model 15 Modular Synthesizer has 898 ratings behind it against 114, so its average is the more settled of the two. Written reviews are what separate them: 86% of Model 15 Modular Synthesizer's written reviews are positive against 92% of iOptigan's.

## The numbers

| Metric | Model 15 Modular Synthesizer | iOptigan |
| --- | --- | --- |
| Price | $29.99 | **$5.99** |
| Rating | **[4.9 (898 ratings)](https://appshunter.io/ios/app/model-15-modular-synthesizer/id1041465860/reviews)** | [4.8 (114 ratings)](https://appshunter.io/ios/app/ioptigan/id1143470101/reviews) |
| Number of ratings | **898** | 114 |
| Positive reviews | 86.5% of reviews | **92.2% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | — | **#116** |
| Size | 857 MB | 179 MB |
| Requires iOS | 12.4 | **8.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [Moog Music Inc.](https://appshunter.io/developer/396776421) | [Stefan Stenzel](https://appshunter.io/developer/1143470100) |

## What reviewers say

### Model 15 Modular Synthesizer

[App page](https://appshunter.io/ios/app/model-15-modular-synthesizer/id1041465860)

This app recreates a legendary modular synthesizer for mobile devices. Explore its iconic modules, experiment with sound design, and create music with intuitive controls and advanced features.

**Highlights:** Iconic Moog module recreation, Monophonic and 4-voice polyphonic operation, Integrated Moog keyboard and ribbon controller, Sequencing arpeggiator, MIDI integration and external control, Looping recorder with overdubbing, AUv3 Audio Unit Extensions support

**Features:** Family Sharing, Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Symbiotic Equations | Free | one-time |
| Synthesist Toolkit | Free | one-time |
| Angular Arps | $1.99 | one-time |
| Sonic Mayhem | $2.99 | one-time |
| Sinfonietta Sintesi | $2.99 | one-time |
| Psychotropic Synthesis | $2.99 | one-time |
| Alien Systems | $3.99 | one-time |
| Textural Points | $4.99 | one-time |
| Mid-Century Moog | $4.99 | one-time |
| Dynamic Drones | $4.99 | one-time |
| Mercurial Strategies | $5.99 | one-time |

**What reviewers like**

- 🚀 Incredible sound quality
- 👍 Authentic Moog emulation
- 💡 Great for learning modular synthesis
- 🎨 Beautiful and detailed interface
- 🎹 Expressive MIDI capabilities

**What reviewers complain about**

- 🐛 Occasional crashes and glitches
- 🔍 Difficult to navigate on smaller screens
- 🕹️ Challenging to patch and tweak
- 🔋 High CPU usage

**Reported bugs**

- Arpeggiator direction not working as expected
- Distortion and audio issues on latest iOS versions
- Incompatibility with certain DAWs

**Requested features**

- More in-depth tutorials
- Ability to customize module layout
- Zoom/overview option for entire system
- Expanded preset library
- Midi mapping for arpeggiator


### iOptigan

[App page](https://appshunter.io/ios/app/ioptigan/id1143470101)

**Currently charting:** #116 Top Paid · Music (US App Store)

Experience the unique lo-fi sound of a vintage optical organ on your iOS device. This app faithfully recreates the original instrument's sound and functionality, allowing you to play chord patterns and explore different musical styles. It includes a virtual spring reverb, metronome, and MIDI capabilities for expanded creative control.

**Highlights:** Authentic lo-fi optical organ sound, Virtual spring reverb, Optical metronome, MIDI in/out and chord detection, Sequencer with record/playback, Audio and MIDI file sharing

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (16)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Champagne Music | $0.99 | one-time |
| Country Waltz | $0.99 | one-time |
| Romantic Strings | $0.99 | one-time |
| Big Top Marching Band | $0.99 | one-time |
| Polynesian Village | $0.99 | one-time |
| Singing Rhythm | $0.99 | one-time |
| Rollin’ Easy | $0.99 | one-time |
| Movin' | $0.99 | one-time |
| Cathedral Organ | $0.99 | one-time |
| Vox Humana | $0.99 | one-time |
| Country Sunshine | $0.99 | one-time |
| Down Home | $0.99 | one-time |
| Gospel Rock | $0.99 | one-time |
| Guitar Boogie | $0.99 | one-time |
| New Orleans Blues | $0.99 | one-time |
| Complete Disc Pak | $5.99 | one-time |

**What reviewers like**

- 🤩 Incredible sound quality
- 🎶 Unique musical instrument recreation
- ✨ Dream come true for musicians
- 🎹 Great for experimentalists
- 👍 Well-executed and fun

**What reviewers complain about**

- 🐛 Stuck/phantom keys
- 🐛 Audio clipping issues
- 🐛 Left-only headphone audio
- 🐛 Touch issues on bottom row
- 🐛 InterApp Audio broken in Garageband

**Reported bugs**

- Stuck/phantom keys on M1 iPad Pro
- E major plays D Diminished sample
- Bottom row of controls unresponsive
- Audio level clipping, especially when slowing playback
- Left-only headphone audio output

**Requested features**

- Update codebase with AudioKit Engine
- Allow app to run in background
- Add AudioUnit Extension support
- Include newly released sound packs
- Clarify chord identification methods


## Frequently asked questions

### Is Model 15 Modular Synthesizer free?

Model 15 Modular Synthesizer costs $29.99, and also offers in-app purchases.

### Is iOptigan free?

iOptigan costs $5.99, and also offers in-app purchases.

### Which has better reviews, Model 15 Modular Synthesizer or iOptigan?

Model 15 Modular Synthesizer is rated higher. Model 15 Modular Synthesizer averages 4.9 out of 5 from 898 ratings, while iOptigan averages 4.8 from 114 ratings.

### Do Model 15 Modular Synthesizer or iOptigan have ads?

Neither Model 15 Modular Synthesizer nor iOptigan shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*