Comparison

Phase Monkey vs GSDSP Quantum Delay

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

Head to head
About

Phase Monkey

Explore a versatile digital synthesizer inspired by 1980s phase distortion technology. Create a wide range of sounds from warm pads to aggressive basses with its unique engine and eight-stage envelopes. Optimized for touch interaction, it also supports MIDI controllers and runs across Apple devices.

Highlights
  • Phase distortion synth engine
  • Eight-stage envelopes
  • Touch-first interface
  • AUv3 plugin support
  • Universal Apple purchase
  • MIDI controller support
  • iCloud preset syncing
Features
Read full description

Phase Monkey is a polyphonic synthesizer inspired by the classic phase distortion synthesizers of the mid-1980s. However, instead of being a direct copy, Phase Monkey presents a fresh take on the classic sound engine, including the rare eight-stage envelopes. The result is a surprisingly versatile digital instrument that can produce anything from warm pads to shimmering leads to snarling basses. Whatever you do, don’t have fun with it! Features: - Focused, fun, and characterful synth engine - Touch-first design, almost the entire screen is part of a control - Runs standalone or as AUv3 plug-in (in compatible host) - Universal purchase on Apple platforms: runs on iPhone, iPad, and Mac - Presets synced across your devices via iCloud - Hook up a MIDI controller to play with a keyboard (optional) Details: - Eight classic phase distortion waveforms - Dedicated modulation oscillator for ring or noise modulation - Three rare eight-stage envelopes - Complex modulation of pitch and timbre possible via envelopes - LFO with five waveforms for classic modulation sounds - Master controls: portamento, random voice pan, onboard chorus, gain - Key behavior modes: poly, monophonic retrig, monophonic legato - Additional MIDI modulation sources: mod wheel, pitch bend, velocity, aftertouch (channel), key follow - Includes 40 highly usable factory presets to get you started making music Check out our YouTube: https://www.youtube.com/@sketchaudio Read the manuals: https://sketchaudio.com/manuals/

About

GSDSP Quantum Delay

This app offers a vintage-inspired stereo delay effect with advanced modulation, flexible filtering, and precise timing controls. It allows users to sculpt unique echo textures, from warm analog sounds to complex, evolving soundscapes.

Highlights
  • Vintage-inspired stereo delay
  • Deep modulation system
  • Flexible filtering (LPF, HPF, BPF)
  • Precise timing controls (BPM, ms)
  • Switchable stereo/dual mono modes
  • Advanced modulation sources (LFO, Random, Envelope)
Features
Read full description

A vintage-inspired delay supercharged with deep modulation, flexible filtering, and creative timing that pushes echoes into new dimensions. Classic Delay, Reinvented Quantum Delay takes the charm of a vintage stereo delay and fuses it with our next-level modulation system. Switch between the warm character of Tape mode and the pristine clarity of Fade mode, lock to BPM (including 5-tuplets) or dial in precise times in milliseconds. Use the Fine control for subtle push-and-pull micro-timing — or modulate your delay lines in ways traditional delays could only dream of. Sculpted Echoes Shape your repeats with switchable lowpass, highpass, and bandpass filters placed directly in the feedback path. Add modulation to create evolving tones, gentle movement, or drifting, frequency-shifting echoes. From warm analog-style rolls to shimmering, swirling textures, it’s all there. Feedback with Precision Control your delay tail behavior using either traditional % feedback or our modern dB-per-second decay system — ideal for predictable, musical decay even when the feedback path becomes complex. Enable Crossfeed for classic ping-pong stereo bounce, or push into Over-Feedback to create dense, self-building echoes that drift toward infinity. Stereo or Dual Mono Every section of Quantum Delay — delay, filter, and feedback — can switch between stereo and dual mono modes. Create tight, controlled stereo images or break them apart for wide, offset, unpredictable spaces. Dual mono modulation unlocks complex stereo interplay and beautifully asymmetric echoes. Modulation Without Limits Quantum Delay integrates our advanced modulation system, letting you modulate nearly anything: delay time, filters, feedback parameters, stereo controls, and more. Use LFOs, Random Generators, 2D modulators, Envelope Followers, Macros, and even chaotic systems to push your echoes far beyond traditional delay behavior. Or use our parameter randomisation feature to explore the plugin’s sound at random. Quantum Delay is an AUv3 audio effect plugin compatible with Logic Pro, AUM, Cubasis, GarageBand and many more. A Desktop version is also available for Windows and macOS (VST3 / AU / AAX). More information here: https://gs-dsp.com/products

Screenshots

Phase Monkey3 screens
GSDSP Quantum Delay3 screens

Verdict

The call

The clearest difference is price: Phase Monkey at $5.99 against GSDSP Quantum Delay's $14.99. Phase Monkey also leads on update cadence (weekly vs every 5 weeks). GSDSP Quantum Delay's advantage is review sentiment (100% vs 71%) and iOS requirement (12.0 vs 15.0). On rating, ratings volume, ads and in-app purchases 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

Phase Monkey costs $5.99 and GSDSP Quantum Delay $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Phase Monkey against 4.8 for GSDSP Quantum Delay. Both are backed by a comparable volume of ratings — 19 and 17 respectively. Written reviews are what separate them: 71% of Phase Monkey's written reviews are positive against 100% of GSDSP Quantum Delay's.

UpkeepUpdate frequency

Phase Monkey ships an update weekly, GSDSP Quantum Delay every 5 weeks. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 6 level
Phase Monkey versus GSDSP Quantum Delay: the parameters behind the verdict, then further details
ParameterPhase MonkeyGSDSP Quantum Delay
Price$5.99 — better$14.99
Rating4.8 (19 ratings)4.8 (17 ratings)
Positive reviews71.4% of reviews100.0% of reviews — better
Number of ratings19 — better17
Update frequencyWeekly — betterEvery 5 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size15 MB94 MB
Age rating4+4+
DeveloperSketch Audio, LLCGustav Scholda

Customer experience

Phase Monkey

All ratings19 ratings
Positive94.7%
Neutral0.0%
Negative5.3%
Written reviews7 reviews
Positive71.4%
Neutral14.3%
Negative14.3%

GSDSP Quantum Delay

All ratings17 ratings
Positive94.1%
Neutral0.0%
Negative5.9%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Phase Monkey

No in-app purchases

None

GSDSP Quantum Delay

No in-app purchases

Questions

Is Phase Monkey free?
Phase Monkey costs $5.99, with no in-app purchases.
Is GSDSP Quantum Delay free?
GSDSP Quantum Delay costs $14.99, with no in-app purchases.
Which has better reviews, Phase Monkey or GSDSP Quantum Delay?
Phase Monkey and GSDSP Quantum Delay are both rated 4.8 out of 5 on the App Store, from 19 and 17 ratings respectively.
Do Phase Monkey or GSDSP Quantum Delay have ads?
Neither Phase Monkey nor GSDSP Quantum Delay shows ads.
Which is updated more often, Phase Monkey or GSDSP Quantum Delay?
Phase Monkey ships an update weekly, and GSDSP Quantum Delay every 5 weeks. Most recently, Phase Monkey was updated on September 23, 2026 and GSDSP Quantum Delay on September 22, 2026.

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