Comparison

iSyn Poly vs SynthMaster One

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

Head to head
About

iSyn Poly

Create electronic music with three virtual analog synthesizers and a drum machine. Features a full sequencer for arranging songs and live editing capabilities. Supports external MIDI keyboards for enhanced control.

Highlights
  • Three programmable virtual analog synthesizers
  • Sample playback drum machine with 17 kits
  • Full-featured four-track sequencer
  • Gesture-oriented user interface for live editing
  • Support for CoreMIDI compatible hardware keyboards
  • Global effects unit with phaser, flanger, chorus, and delay
Read full description

iSyn Poly is an electronic music studio for use with Apple iPad. iSyn Poly places an unbelievable number of features including three studio-quality, fully programmable virtual analog synthesizers and a drum machine packed in just three different screens on your iPad ! Each synthesizer is a full-featured analog modeling synth with three oscillators, a classic 24 db/oct ladder-style lowpass filter, independent filter and amp envelope generators, and full modulation routings. With our 10+ years of experience with analog simulations you can expect some serious sound easily covering all those fat frequencies so prevalent in modern production. iSyn Poly also includes a sample playback-based drum machine with seventeen kits, each containing eight samples. Drum samples include 808, 909, modular synth drums and numerous 80's drum machines. Volume, pan and decay time are individually adjustable and pitches are tunable over a wide range for crazy effects. The full fledged sequencer let you arrange complete songs and can record the notes and controller movements of your performance. The unique gesture oriented user interface makes it ideal for live editing of notes and automations. With the Apple iPad Camera Connection Kit you can use a CoreMIDI compatible MIDI Keyboard to control iSyn Poly. iSyn Poly is developed by VirSyn with content from audioMIDI.com. Features: Three Independent Synthesizers One polyphonic synth with eight voices and two monophonic synths with: • Three oscillators with sawtooth, pulse, triangle and sine waves. Modulations routings: LFO->pitch, filter ADSR->cutoff, LFO->pulse width. • White/Pink noise generator. • Classic 24 dB/oct  ladder-style lowpass filter with drive parameter. Modulations routings:  LFO->Cutoff, Filter ADSR->Cutoff. • Amp section includes distortion with drive, asymmetry and crusher. • Control matrix allows real time control of five parameters using the X/Y touch pad, the modulation wheel and the tilt sensors of the iPad.  • Arpeggiator for automated sequences.  • 64 factory presets, unlimited user presets can be shared.  Drum Machine • Eight simultaneous instruments arranged into eight user-selectable drum kits. • Editor page allows tuning, panning, level and decay time for individual instruments. Effects Section • iSyn Poly features one global effects unit with phaser, flanger, chorus and stereo/cross delay. Live  • Play melodies live with onscreen keyboard/drum pads. Drag fingers for slides and vibrato.  • Optionally use CoreMIDI compatible hardware keyboard.  Full featured Sequencer • Four track sequencer with piano roll and automation editor.  • Real time recording with quantize function and metronome. • Arrange your songs with variable length patterns. Move and copy/paste patterns. • Recording and playback of X/Y Pad movements, mod wheel, pitch bend and key velocity. • Full set of editing functions with unlimited undo. Global • Manage unlimited number of songs. • Render song or patterns to audio and midi files. • Audio pasteboard. • Audiobus 2 support (requires iOS 7 or newer). • Exchange songs and user presets with File Sharing in iTunes.

About

SynthMaster One

This powerful wavetable synthesizer app offers an intuitive workflow for creating unique sounds. It features a rich library of wavetables, inspiring presets, and a semi-modular architecture for deep sound design. Easily sync data across devices and integrate with DAWs.

Highlights
  • Wavetable synthesis
  • Semi-modular architecture
  • 650 factory presets
  • AUv3 support
  • Cross-platform cloud sync
  • Real-time modulation feedback
  • 32-step arpeggiator/sequencer
Read full description

SynthMaster One iOS is KV331 Audio's first full blown universal synth app on iOS platform. It's a powerful wavetable synth with an intuitive workflow. With its simple layout, rich wavetable/waveform content and inspiring factory presets library, designing new sounds with SynthMaster One iOS is a joy. SynthMaster One iOS is feature wise identical to the desktop version except the following: * 16 voice polyphony (32 for the desktop version) * Comes with 650 presets (1250 for the desktop version) FEATURES * Universal App: SynthMaster One is now a universal standalone/AUv3 synth app running on iPhone 7 and above. * 650 Factory Presets: SynthMaster One iOS comes with inspiring factory presets from a world class team of sound designers: Arksun, Aiyn Zahev, BigTone Studios, Brian Transeau, Bluffmunkey, Bulent Biyikoglu, Gercek Dorman, Dejavu Sound, Fragment Audio, Kurt Ader, Mirko Ruta, Nori Ubukata, Rob Lee, Ufuk Kevser, Selcuk Ergen, The Machine, Vandalism Sound, Venus Theory, Vorpalsound and Xenos Soundworks * AUv3: SynthMaster One iOS supports AudioUnits V3, allowing multiple instances to run under supporting DAW apps like GarageBand, Cubasis or Beat Maker. * Files App Integration: Easily import/export presets, waveforms or scales using the common file browser UI (requires iOS 11+). * Real-time Modulation Feedback: See in real-time how modulation sources and targets change. This is a very helpful feature when designing sounds! * Cross Platform Cloud Synchronization: Easily synchronize your SynthMaster One related data across multiple platforms (Windows, MacOS, iPad, iPhone) * Semi-Modular Architecture: For each SynthMaster One instance, there are 2 oscillators with 2 sub oscillators, 2 Filters, 4 ADSR Envelopes, 3 LFOs, a powerful 16 step arpeggiator/sequencer and also 11 different effects that can be inserted on to 6 FX insert slots. The sub oscillators can be connected to the oscillators in 5 different modes which let you use it as a regular sub oscillator or do complex modulations such as ring modulation, amplitude modulation, phase modulation or frequency modulation. * 32 Step Arpeggiator/Sequencer: The arpeggiator in SynthMaster One features classic arpeggiator modes such as Up, Down, UpDown, DownUp, UpDown2, DownUp2, AsPlayed as well as Sequence, Chord and Arpeggiate modes. * Wavetable Synthesis: SynthMaster One implements true wavetable synthesis which opens up new possibilities for sound design. It comes with a rich content library with hundreds of waveforms and wavetables. * Stereo Oscillators with up to 16 voices Unison: Each of the 2 oscillators in SynthMaster One have stereo output, and can have up to 16 voices "unison". Using the "voices", "voices mix", "detune curve", "detune spread", "pan stread", "tone spread" and "phase spread" parameters, each oscillator can generate a rich "supersaw" type sound. * Zero Delay Feedback Filters: All of the 4 filter categories in SynthMaster One are developed using the zero delay feedback filter technology. With advanced filter parameters like input gain, drive, acid, filter nonlinearities and up to 4 times oversampling you can get that "analog" sound from the filters! * Rich Set of Effects: SynthMaster One features 11 different effect types: Distortion, LoFi, Ensemble, Phaser, 6 Band EQ, Compressor, Vocoder, Delay, Chorus, Tremolo, Reverb. * Microtuning: SynthMaster One supports Scala tuning, so tuning can be set either for each preset or globally by loading from a Scala tuning file. SynthMaster One comes with 300+ scales ranging from 5 note equal tempered scales to 12 note alternate tuning scales. * Preset Browser: SynthMaster One features a comprehensive preset browser with separate search criterias for instrument type, preset attributes, music style or preset author. SUPPORTS * All 64-bit iPad devices * AUv3 Audio Unit Extensions * Note-per-channel MIDI controllers (MPE) * Ableton Link * Bluetooth LE MIDI Controllers * AirDrop

Screenshots

SynthMaster One4 screens

Verdict

The call

The clearest difference is price: iSyn Poly at $0.99 against SynthMaster One's $9.99. iSyn Poly also leads on in-app purchases (none vs 11) and iOS requirement (8.0 vs 10.0). SynthMaster One's advantage is rating (4.7 vs 4.3) and ratings volume (743 vs 4). On review sentiment 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

iSyn Poly costs $0.99 and SynthMaster One $9.99 up front. SynthMaster One sells 11 one-off in-app purchases. iSyn Poly asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

SynthMaster One holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: SynthMaster One has 743 ratings behind it against 4, so its average is the more settled of the two. Written reviews split almost evenly too, at 64% and 64% positive.

UpkeepUpdate frequency

iSyn Poly ships an update every 6 months, SynthMaster One every 2 months. The most recent releases landed on September 25, 2026 and October 11, 2026 respectively.

Scorecard8 real differences · 2 level
iSyn Poly versus SynthMaster One: the parameters behind the verdict, then further details
ParameteriSyn PolySynthMaster One
Price$0.99 — better$9.99
Rating4.3 (4 ratings)4.7 (743 ratings) — better
Positive reviews64.0% of reviews — better63.8% of reviews
Number of ratings4743 — better
Update frequencyEvery 6 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPadiPhone, iPad, iPod — better
Requires iOS8.0 — better10.0
Further details — not scored
Size19 MB402 MB
Age rating4+4+
DeveloperHarry GohsKV331 Audio

Customer experience

iSyn Poly

All ratings4 ratings
Positive75.0%
Neutral25.0%
Negative0.0%
Written reviews25 reviews
Positive64.0%
Neutral20.0%
Negative16.0%

SynthMaster One

All ratings743 ratings
Positive92.9%
Neutral2.6%
Negative4.6%
Written reviews207 reviews
Positive63.8%
Neutral10.6%
Negative25.6%

Bugs and requests

iSyn Poly

Not enough reviews yet to summarise bugs or requests.

SynthMaster One

Reported bugs

4 issues
  • Stuck notes and MIDI issues
  • Preset loading crashes
  • Restore purchases not working
  • Incompatibility with certain DAWs

Requested features

4 requests
  • Add custom wavetable support
  • Improve MIDI mapping and MPE functionality
  • Optimize performance on older devices
  • Streamline preset management and browsing

In-app purchases

None

iSyn Poly

No in-app purchases

11 purchases

SynthMaster One

One-time11
  • BigTone Club Construction Set$4.99
  • True Trance Sounds Volume 1$4.99
  • Vandalism Future House$4.99
Show 8 more
  • NatLife Retrowave Sounds Vol.1$4.99
  • Demis Hellen Euphoric Trance$4.99
  • Venus Theory Trap Sounds$4.99
  • Vandalism Shocking Future Bass$4.99
  • NatLife Progressive&Deep Vol.1$4.99
  • Bluffmunkey Cinematic Sounds$4.99
  • Desktop Presets Upgrade$7.99
  • SM One Expansions Bundle$24.99

Questions

Is iSyn Poly free?
iSyn Poly costs $0.99, with no in-app purchases.
Is SynthMaster One free?
SynthMaster One costs $9.99, and also offers in-app purchases.
Which has better reviews, iSyn Poly or SynthMaster One?
SynthMaster One is rated higher. iSyn Poly averages 4.3 out of 5 from 4 ratings, while SynthMaster One averages 4.7 from 743 ratings.
Do iSyn Poly or SynthMaster One have ads?
Neither iSyn Poly nor SynthMaster One shows ads.
Which is updated more often, iSyn Poly or SynthMaster One?
iSyn Poly ships an update every 6 months, and SynthMaster One every 2 months. Most recently, iSyn Poly was updated on September 25, 2026 and SynthMaster One on October 11, 2026.

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