Comparison

GSDSP Quantum Granulator vs variStretch

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

Head to head
About

GSDSP Quantum Granulator

This live granular processor allows you to break down audio into small pieces or create atmospheric soundscapes. It features dual live buffers, a musical grain engine with tempo sync, and expressive pitch control with MIDI support. Shape your sound with an intuitive XY pad and mix section for detailed sonic manipulation.

Highlights
  • Dual live recording buffers
  • Tempo-synced grain triggering
  • Expressive pitch control with scales
  • 2D XY pad for grain shaping
  • MIDI playable granular instrument
  • AUv3 audio effect plugin
Features
Read full description

This Live Granular Processor lets you decompose audio into bits and pieces or lovely clouds. Dual Live Buffers Quantum Granulator is a powerful live granular processor designed for deep, hands-on sonic manipulation in real-time. Two independent recording buffers capture your signal and let you freeze, loop, or continuously record audio for instant transformation. Whether you’re sampling from the Main Input, Sidechain A, or Sidechain B, you’re in full control of what goes in — and what comes out. Musical Grain Engine Trigger grains freely in Hz or lock them to tempo for tight rhythmic effects. Adjust grain length, offset and density — from crisp stutters to blurred, cinematic clouds. Randomization adapts to your mode: in Hz it behaves like a geiger counter, adding sharp, bursty unpredictability; in BPM sync it becomes more spray-like, scattering grains around the beat for rhythmically coherent textures. Expressive Pitch Control Our easy-to-use scale picker lets you quantize grains to 30+ built-in musical scales, create your own, or let randomness take over. Play grains via MIDI to turn Quantum Granulator into an expressive granular instrument. Pitch shifting covers a broad ±24 semitone range and a separate fine control allows subtle adjustments within ±1 semitone, perfect for microtonal tuning or adding vibrato-like motion. Versatile Grain Shaping An intuitive 2D Envelope XY pad lets you sharpen or soften vertically, adjust attack and release horizontally. Control level, panning, and filtering to craft subtle movement or fully chaotic sound clusters. Shape the balance using the mix section — from subtle texture to complete granular obliteration. Granular Synthesis, Made Playable Quantum Granulator isn’t just a tool — it’s an instrument. Built for performers, producers, and sound explorers alike, it offers a deep but immediate interface into the world of granular synthesis, with every detail tuned for musicality and expression. Quantum Granulator 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

About

variStretch

This app allows real-time audio speed manipulation without altering pitch. It offers three distinct playback modes and adjustable buffer settings for precise control over sound processing.

Highlights
  • Real-time speed adjustment (0.5-2.0x)
  • Tape mode (speed & pitch change)
  • Phase Vocoder mode (speed only)
  • Adjustable buffer size
  • Buffer clear function
  • AUv3 host compatibility
Read full description

Concept: The app is a so-called time-stretch machine. The user can change the speed (0.5-2.0) of audio source in real-time using keyboard or slider at will. Usage: There are three play modes: 1) Tape (to change the both speed & pitch) 2) Phase Vocoder (to change the speed alone) 3) Thru (no processing) "Buffer Size" slider determines how long the data will be stored. "Buffer Clear" button will reset the buffer to be zero. System Requirements: AUv3 host

Screenshots

GSDSP Quantum Granulator3 screens
variStretch2 screens

Verdict

The call

The clearest difference is price: variStretch at $5.99 against GSDSP Quantum Granulator's $14.99. GSDSP Quantum Granulator's advantage is update cadence (every 6 weeks vs every 7 months) and ratings volume (7 vs 1). On rating, ads, in-app purchases and monetization model 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

GSDSP Quantum Granulator costs $14.99 and variStretch $5.99 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 — 5.0 for GSDSP Quantum Granulator against 5.0 for variStretch. That said, the two scores are not equally well evidenced: GSDSP Quantum Granulator has 7 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

GSDSP Quantum Granulator ships an update every 6 weeks, variStretch every 7 months. The most recent releases landed on October 28, 2026 and October 18, 2026 respectively.

Scorecard3 real differences · 7 level
GSDSP Quantum Granulator versus variStretch: the parameters behind the verdict, then further details
ParameterGSDSP Quantum GranulatorvariStretch
Price$14.99$5.99 — better
Rating5.0 (7 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings7 — better1
Update frequencyEvery 6 weeks — betterEvery 7 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size61 MB15 MB
Age rating4+4+
DeveloperGustav ScholdaSatoshi Kajii

Customer experience

GSDSP Quantum Granulator

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

variStretch

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

GSDSP Quantum Granulator

No in-app purchases

None

variStretch

No in-app purchases

Questions

Is GSDSP Quantum Granulator free?
GSDSP Quantum Granulator costs $14.99, with no in-app purchases.
Is variStretch free?
variStretch costs $5.99, with no in-app purchases.
Which has better reviews, GSDSP Quantum Granulator or variStretch?
GSDSP Quantum Granulator and variStretch are both rated 5.0 out of 5 on the App Store, from 7 and 1 ratings respectively.
Do GSDSP Quantum Granulator or variStretch have ads?
Neither GSDSP Quantum Granulator nor variStretch shows ads.
Which is updated more often, GSDSP Quantum Granulator or variStretch?
GSDSP Quantum Granulator ships an update every 6 weeks, and variStretch every 7 months. Most recently, GSDSP Quantum Granulator was updated on October 28, 2026 and variStretch on October 18, 2026.

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