Comparison

PhaseDelayArray vs SynthMaster One for iPhone

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

Head to head
About

PhaseDelayArray

This audio effect application provides a unique combination of oscillating reverb, modulation, and feedback delay. It can be used to create a wide range of subtle to extreme soundscapes within compatible music production software.

Highlights
  • Oscillating reverb sections
  • Modulation unit
  • Feedback delay up to 2 seconds
  • Multiple mix points
  • Mono-to-mono, mono-to-stereo, stereo-to-stereo support
Features
Read full description

PhaseDelayArray is an Audio Unit, or AU, for iOS. This application is simply a container for the Audio Unit and also serves as the documentation for the AU. PhaseDelayArray must be used in some sort of Audio Unit host or DAW application. PhaseDelayArray is a bit of a strange effect. O.K, so, what is it? PhaseDelayArray has three effect units chained together in an interesting configuration, and one of these units is just a little bit twisted. The first unit consists of a sequential array of vibrating (oscillating) reverberation sections. The oscillations can be tiny or huge. The reverb depth can be tiny or huge. The overall effect can be subtle or HUGE. It can create a wide range of sounds. The second section is a modulation unit. It takes the output of the PhaseDelays and whips it around, or up-and-down or back-and-forth. The final section is a feedback unit with the possibility of a lot of delay (up to 2 seconds). The mix section allows you to tap into all this strangeness in four different places. PhaseDelayArray can be used in mono-to-mono, mono-to-stereo, or stereo-to-stereo settings. Several of the features work best with a stereo output.

About

SynthMaster One for iPhone

This powerful wavetable synthesizer app offers an intuitive workflow for creating new sounds. It features a rich library of wavetables, inspiring factory presets, and real-time modulation feedback for sound design.

Highlights
  • Wavetable synthesis
  • 300 factory presets
  • AUv3 support
  • Files App integration
  • Real-time modulation feedback
  • Semi-modular architecture
  • 32-step arpeggiator/sequencer
Read full description

SynthMaster One for iPhone is KV331 Audio's first full blown synth app for iPhone. 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 for iPhone is a joy. SynthMaster One for iPhone is feature wise identical to the desktop version except the following: * 8 voice polyphony (32 for the desktop version) * Comes with 300 presets (1250 for the desktop version) FEATURES * 300 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 * Interapp Audio and AudioBus * Bluetooth LE MIDI Controllers * AirDrop

Screenshots

PhaseDelayArray4 screens
SynthMaster One for iPhone4 screens

Verdict

The call

The clearest difference is in-app purchases: PhaseDelayArray at none against SynthMaster One for iPhone's 10. PhaseDelayArray also leads on review sentiment (77% vs 66%). SynthMaster One for iPhone's advantage is rating (4.8 vs 4.5) and ratings volume (331 vs 45). On price, update cadence, ads 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

Both are free to download. SynthMaster One for iPhone sells 10 one-off in-app purchases. PhaseDelayArray asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

SynthMaster One for iPhone holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: SynthMaster One for iPhone has 331 ratings behind it against 45, so its average is the more settled of the two. Written reviews complicate that: 77% of PhaseDelayArray's written reviews are positive against 66% of SynthMaster One for iPhone's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on August 3, 2026 and September 19, 2026 respectively.

Scorecard5 real differences · 5 level
PhaseDelayArray versus SynthMaster One for iPhone: the parameters behind the verdict, then further details
ParameterPhaseDelayArraySynthMaster One for iPhone
PriceFreeFree
Rating4.5 (45 ratings)4.8 (331 ratings) — better
Positive reviews76.9% of reviews — better66.0% of reviews
Number of ratings45331 — better
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS11.010.0 — better
Further details — not scored
Size9 MB297 MB
Age rating4+4+
DeveloperNeon SiliconKV331 Audio

Customer experience

PhaseDelayArray

All ratings45 ratings
Positive84.4%
Neutral6.7%
Negative8.9%
Written reviews13 reviews
Positive76.9%
Neutral7.7%
Negative15.4%

SynthMaster One for iPhone

All ratings331 ratings
Positive94.9%
Neutral2.1%
Negative3.0%
Written reviews50 reviews
Positive66.0%
Neutral6.0%
Negative28.0%

Bugs and requests

PhaseDelayArray

Not enough reviews yet to summarise bugs or requests.

SynthMaster One for iPhone

Reported bugs

10 issues
  • App crashes when loading saved presets
  • App crashes when setting default sound
  • AUv3 option disappears in GarageBand
  • Inability to reload user patches without crashing
  • Inability to purchase certain IAP packs
Show 5 more
  • Cells don't save, revert to first synth
  • App doesn't function or open in GarageBand
  • Every note is 1 note or lower
  • GUI is cut off on iPhone SE
  • IAA not loading in FL mobile

Requested features

10 requests
  • Fix in-app purchase issues
  • Improve GarageBand AUv3 stability
  • Enable saving of custom presets
  • Address crashing when loading presets
  • Fix note pitch issues
Show 5 more
  • Ensure app is not abandonware
  • Improve UI scaling on smaller screens
  • Fix wavetable scrolling issues
  • Make IAA work properly
  • Allow recording of music

In-app purchases

None

PhaseDelayArray

No in-app purchases

10 purchases

SynthMaster One for iPhone

One-time10
  • BigTone Club Construction Set$4.99
  • True Trance Sounds Volume 1$4.99
  • Vandalism Future House$4.99
Show 7 more
  • NatLife Retrowave Sounds Vol.1$4.99
  • Demis Hellen Euphoric Trance$4.99
  • NatLife Progressive&Deep Vol.1$4.99
  • Vandalism Shocking Future Bass$4.99
  • Venus Theory Trap Sounds$4.99
  • Desktop Presets Upgrade$9.99
  • SM One Expansions Bundle$24.99

Questions

Is PhaseDelayArray free?
PhaseDelayArray is free to download, with no in-app purchases.
Is SynthMaster One for iPhone free?
SynthMaster One for iPhone is free to download, with in-app purchases available.
Which has better reviews, PhaseDelayArray or SynthMaster One for iPhone?
SynthMaster One for iPhone is rated higher. PhaseDelayArray averages 4.5 out of 5 from 45 ratings, while SynthMaster One for iPhone averages 4.8 from 331 ratings.
Do PhaseDelayArray or SynthMaster One for iPhone have ads?
Neither PhaseDelayArray nor SynthMaster One for iPhone shows ads.
Which is updated more often, PhaseDelayArray or SynthMaster One for iPhone?
PhaseDelayArray ships an update every 2 months, and SynthMaster One for iPhone every 2 months. Most recently, PhaseDelayArray was updated on August 3, 2026 and SynthMaster One for iPhone on September 19, 2026.

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