GSDSP Quantum Granulator vs variStretch
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | GSDSP Quantum Granulator | variStretch |
|---|---|---|
| Price | $14.99 | $5.99 — better |
| Rating | 5.0 (7 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 7 — better | 1 |
| Update frequency | Every 6 weeks — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 61 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Gustav Scholda | Satoshi Kajii |
Customer experience
GSDSP Quantum Granulator
variStretch
In-app purchases
GSDSP Quantum Granulator
No in-app purchases
variStretch
No in-app purchases
Questions
Is GSDSP Quantum Granulator free?
Is variStretch free?
Which has better reviews, GSDSP Quantum Granulator or variStretch?
Do GSDSP Quantum Granulator or variStretch have ads?
Which is updated more often, GSDSP Quantum Granulator or variStretch?
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