Comparison

iVCS3 vs Model 15 Modular Synthesizer

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

Head to head
About

iVCS3

This application emulates the iconic EMS VCS3 synthesizer, a pioneering portable synthesizer from 1969. It recreates the original's unique sound generation capabilities, including its oscillators, filters, and patch matrix, allowing users to explore its distinctive sonic palette.

Highlights
  • Official EMS VCS3 emulation
  • Three oscillators (2 VCOs, 1 LFO)
  • Noise generator
  • Voltage controlled low pass filter (VCF)
  • Patch board matrix
  • Joy-stick controller
  • Voltage controlled spring reverb
Features
Read full description

iVCS3 Official EMS VCS3 emulator The VCS3 was created in 1969 by Peter Zinovieff's EMS company. The electronics were largely designed by David Cockerell and the machine's distinctive visual appearance was the work of electronic composer Tristram Cary. The VCS3 was more or less the first portable commercially available synthesizer—portable in the sense that the VCS 3 was housed entirely in a small, wooden case. The VCS3 was quite popular among progressive rock bands and was used on recordings by The Alan Parsons Project, Jean Michel Jarre, Hawkwind, Brian Eno (with Roxy Music), King Crimson, The Who, Gong, and Pink Floyd, among many others. Well-known examples of its use are on The Who track "Won't Get Fooled Again" (as an external sound processor, in this case with Pete Townshend running the signal of a Lowrey Organ through the VCS3's filter and low frequency oscillators) on Who's Next. Pink Floyd's "On the Run" (from The Dark Side of the Moon) made use of its oscillators, filter and noise generator, as well as the sequencer. Their song Welcome to the Machine also used the VCS3. The bassy throb at the beginning of the recording formed the foundation of the song, with the other parts being recorded in response. The VCS3 was also a staple at the BBC’s Radiophonic Workshop, and was a regular (and most frightening) sound generator for the Dr Who TV series. Many fo the monsters and atmoshere;s created for the show came directly from the VCS3. Description The VCS3 has three oscillators (in reality, the first 2 oscillators are normal oscillators and the 3rd an LFO or Low Frequency Oscillator), a noise generator, two input amplifiers, a ring modulator, a 18dB/octave (pre-1974) or 24dB/octave (after 1974) voltage controlled low pass filter (VCF), a trapezoid envelope generator, joy-stick controller, voltage controlled spring reverb unit and 2 stereo output amplifiers. Unlike most modular synthesizer systems which use cables to link components together, the VCS3 uses a distinctive patch board matrix into which pins are inserted in order to connect its components together. Keyboards controller DK1 keyboard controller Although the VCS3 is often used for generating sound effects due to lack of built-in keyboard, there were external keyboard controllers for melodic play. The DK1 in 1969 was an early velocity sensitive monophonic keyboard for VCS3 with an extra VCO and VCA. Later it was extended for duophonic play, as DK2, in 1972. Also in 1972, Synthi AKS was released, and its digital sequencer with a touch-sensitive flat keyboard, KS sequencer, and its mechanical keyboard version, DKS, were also released. (See: en.wikipedia.org/wiki/VCS3)

About

Model 15 Modular Synthesizer

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
Read full description

The Moog Model 15 App is the first Moog modular synthesizer and synthesis educational tool created exclusively for iPad, iPhone and iPod touch. Each facet of the Moog Model 15 modular synthesizer has been meticulously recreated in this application to ensure the power and transcendent sound quality of each module remains intact. The character, harmonic complexity and mystique of the Moog Model 15’s modules, from the legendary Moog 921–series oscillators and 904A Low Pass Filter, to the coveted 907 Fixed Filter Bank have been painstakingly preserved. In order to develop the most immersive and expressive modular interface possible, the Model 15 App has been designed utilizing Apple’s new Metal advanced graphics engine. This ensures that all zooming, panning and modular patching throughout the application feels completely natural, something that would have been impossible otherwise. The Model 15 App features both monophonic and 4-voice polyphonic operation is easily commanded via 4 seamlessly integrated controllers. Simple swipes and taps provide instant access to a traditional Moog keyboard, 1150 ribbon controller, 8-step sequencing arpeggiator and the award-winning Animoog keyboard with 22 built-in scales and polyphonic modulation capabilities. Also included are extended features which expand the capabilities of the app beyond the traditional offerings of the hardware Moog Model 15. These include total MIDI integration, assignment for external control, use as a MIDI controller, dedicated Audio Bridge and MIDI Bridge modules, looping recorder module with overdubbing, a master ping-pong delay module and a new extension cabinet that includes additional amplifiers and voltage-controlled reversible attenuators that can be used for effects like ring-modulation. Because the Model 15 App utilizes Apple’s Metal technology, only 64-bit devices are supported. Compatible devices include iPhone 5s or newer, iPod touch 6 or newer, iPad Air or newer, and the iPad Pro. The Model 15 App requires iOS version 12.4 or later to work. Additional Features • Ships with over 160 unique presets • Recreates the sound of a hardware Moog Model 15 modular synthesizer • Easily share presets and recordings with anyone • Tutorial patches to assist all experience levels • Intuitive patching and cable coloring • Support for landscape and portrait modes • Voltage-controlled stereo ping-pong delay • Expressive sequencing arpeggiator • Moog 1150 Ribbon controller • Real-time looping recorder with overdub and immediate sharing • Up to two controllers on-screen (iPad only) • Optional left-handed UI operation Supports • AUv3 Audio Unit Extensions • 3D Touch and Apple Pencil integration for after pressure • Note-per-channel MIDI controllers • Ableton Link • Inter-App Audio and Audiobus • MIDI Bridge and Audio Bridge • 7 and 14-Bit MIDI • MIDI Program Change • Bluetooth LE MIDI controllers • Typing keyboards for shortcuts and musical typing • AudioCopy, AudioPaste and AudioShare

Screenshots

iVCS34 screens
Model 15 Modular Synthesizer4 screens

Verdict

The call

The clearest difference is price: iVCS3 at $19.99 against Model 15 Modular Synthesizer's $29.99. Model 15 Modular Synthesizer's advantage is ratings volume (898 vs 206) and device support (4 vs 2). On rating, review sentiment, update cadence 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

CostPrice · In-app purchases · Ads · Monetization

iVCS3 costs $19.99 and Model 15 Modular Synthesizer $29.99 up front. iVCS3 sells 10 one-off in-app purchases and Model 15 Modular Synthesizer sells 11 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for iVCS3 against 4.9 for Model 15 Modular Synthesizer. Both are backed by a comparable volume of ratings — 206 and 898 respectively. Written reviews are what separate them: 91% of iVCS3's written reviews are positive against 86% of Model 15 Modular Synthesizer's.

UpkeepUpdate frequency

iVCS3 ships an update every 2 months, Model 15 Modular Synthesizer every 3 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

Scorecard4 real differences · 6 level
iVCS3 versus Model 15 Modular Synthesizer: the parameters behind the verdict, then further details
ParameteriVCS3Model 15 Modular Synthesizer
Price$19.99 — better$29.99
Rating4.9 (206 ratings)4.9 (898 ratings) — better
Positive reviews90.7% of reviews — better86.5% of reviews
Number of ratings206898 — better
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS17.012.4 — better
Further details — not scored
Size107 MB857 MB
Age rating4+4+
DeveloperapeSoftMoog Music Inc.

Customer experience

iVCS3

All ratings205 ratings
Positive96.6%
Neutral1.5%
Negative2.0%
Written reviews194 reviews
Positive90.7%
Neutral2.6%
Negative6.7%

Model 15 Modular Synthesizer

All ratings896 ratings
Positive96.8%
Neutral1.7%
Negative1.6%
Written reviews480 reviews
Positive86.5%
Neutral4.0%
Negative9.6%

User reviews

iVCS3

From 206 App Store ratings

What we love

  • 🚀 Faithful recreation of the original
  • 👍 Powerful and versatile sound
  • 🎨 Gorgeous vintage interface
  • 💡 Additional features beyond the original
  • 🎛️ Excellent integration with MIDI and other apps

Room to improve

  • 🐛 Occasional crashes and bugs
  • 🤔 Steep learning curve
  • 🔍 Difficult to navigate the matrix

Model 15 Modular Synthesizer

From 898 App Store ratings

What we love

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

Room to improve

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

Bugs and requests

iVCS3

Reported bugs

3 issues
  • Presets not loading
  • Crashes on iOS 15.04
  • Sampler not functioning properly

Requested features

3 requests
  • Mac compatibility
  • Improved preset management
  • Expanded sampling capabilities

Model 15 Modular Synthesizer

Reported bugs

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

Requested features

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

In-app purchases

10 purchases

iVCS3

One-time10
  • Red Sky Lullaby - 180 PresetsFree
  • Singe Difficile by RUST(i)KFree
  • RUMBLEFree
Show 7 more
  • OLD GRIT - COLLECTIONFree
  • JEC 2018 Iconic PinkFloydFree
  • JEC EMS-50Free
  • SINAPSYA - Under The Dust$2.99
  • LALA - Sonic Pleasures$3.99
  • JEC Mega Bank$4.99
  • Essential EMS Modifications$6.99
11 purchases

Model 15 Modular Synthesizer

One-time11
  • Symbiotic EquationsFree
  • Synthesist ToolkitFree
  • Angular Arps$1.99
Show 8 more
  • Sonic Mayhem$2.99
  • Sinfonietta Sintesi$2.99
  • Psychotropic Synthesis$2.99
  • Alien Systems$3.99
  • Textural Points$4.99
  • Mid-Century Moog$4.99
  • Dynamic Drones$4.99
  • Mercurial Strategies$5.99

Questions

Is iVCS3 free?
iVCS3 costs $19.99, and also offers in-app purchases.
Is Model 15 Modular Synthesizer free?
Model 15 Modular Synthesizer costs $29.99, and also offers in-app purchases.
Which has better reviews, iVCS3 or Model 15 Modular Synthesizer?
Model 15 Modular Synthesizer is rated higher. iVCS3 averages 4.9 out of 5 from 206 ratings, while Model 15 Modular Synthesizer averages 4.9 from 898 ratings.
Do iVCS3 or Model 15 Modular Synthesizer have ads?
Neither iVCS3 nor Model 15 Modular Synthesizer shows ads.
Which is updated more often, iVCS3 or Model 15 Modular Synthesizer?
iVCS3 ships an update every 2 months, and Model 15 Modular Synthesizer every 3 months. Most recently, iVCS3 was updated on October 26, 2026 and Model 15 Modular Synthesizer on October 27, 2026.

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