Comparison

GSDSP Quantum Granulator vs FontStack

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

FontStack

This app allows musicians to load and utilize classic SoundFont (.sf2) files within their digital audio workstation. It offers layering, key splitting, and instrument caching for creative sound design and quick access to a vast library of sounds.

Highlights
  • 4 SoundFont layers
  • Keyboard splits
  • SoundFont stacking
  • Instrument caching
  • Remote folder linking
  • Reverb, Delay, Chorus effects
  • Amp Envelope and Filter control
Features
Read full description

FontStack is a 'fontastic' new AUv3 plugin for iOS which can be loaded into your favourite DAW allowing you to utilise all those wonderful and nostalgic SF2 SoundFonts you've collected over the years. The SoundFont standard was created back in the early 90s, and made famous by the SoundBlaster series of sound cards. With the introduction of the Amiga, it spawned a host of musical creation tools called Trackers, which allowed the Amiga to load these SoundFonts and create sophisticated musical scores of 4 or 8 tracks. These days we don't use this standard so much, but there is a wealth of free SF2 files available on the internet just waiting to be loaded into FontStack. A SoundFont comprises a file with an .sf2 file extension. This file contains a set of samples, instruments, and presets. FontStack enables you to load one or more SoundFonts into its 4 layers, and use them in lots of creative ways. You can stack layers to create a rich combination of multiple tones, or assign each layer its own key range on the keyboard to create virtual splits, or a mixture of the two. Each layer can also be assigned its own MIDI channel for true OMNI mode. One great feature of FontStack is its ability to cache all your SoundFonts and the instruments they contain. This allows quick searching for specific instrument types without the need to physically search through SoundFonts to find them. Another great feature is the ability to optionally link to a remote folder containing a global set of SoundFonts, so that they can be shared between apps. Both internal and external SoundFonts and their instruments will be cached and searching is just as easy as it is using internal SoundFonts. FontStack features: ○ 4 SoundFont Layers which can be stacked, layered or played on different channels. ○ 6 Scenes per Layer containing different SoundFont instruments and settings. ○ Keyboard Splits can be created spreading multiple SoundFonts over a single keyboard. ○ SoundFont Stacks can be created, stacking multiple SoundFonts to produce a bigger, thicker sound. ○ Disk Streaming allows you to stream a SoundFont directly from disk saving physical memory. ○ File Manager allowing local and remote file management. ○ Symbolic Link allows you to specify a remote/external folder from which to access your SoundFonts. ○ Instrument Search allows you to search the content of local and remote SoundFonts folders. ○ Drag and Drop your sound fonts directly into the SoundFont Manager. ○ Reverb, Delay & Chorus effects can be applied to each instrument layer. ○ Haas and Stereo Width can be used to simulate virtual STEREO on SoundFonts with MONO samples. ○ Allows direct control of the SoundFonts Amp Envelope and Filter settings.

Screenshots

GSDSP Quantum Granulator3 screens
FontStack4 screens

Verdict

The call

The clearest difference is rating: GSDSP Quantum Granulator at 5.0 against FontStack's 4.5. GSDSP Quantum Granulator also leads on review sentiment (100% vs 75%). FontStack's advantage is update cadence (every 2 weeks vs every 5 weeks). On price, 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

GSDSP Quantum Granulator costs $14.99 and FontStack $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

GSDSP Quantum Granulator holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 7 and 12 respectively. Written reviews point the same way: 100% of GSDSP Quantum Granulator's written reviews are positive against 75% of FontStack's.

UpkeepUpdate frequency

GSDSP Quantum Granulator ships an update every 5 weeks, FontStack every 2 weeks. The most recent releases landed on September 22, 2026 and September 19, 2026 respectively.

Scorecard3 real differences · 7 level
GSDSP Quantum Granulator versus FontStack: the parameters behind the verdict, then further details
ParameterGSDSP Quantum GranulatorFontStack
Price$14.99$14.99
Rating5.0 (7 ratings) — better4.5 (12 ratings)
Positive reviews100.0% of reviews — better75.0% of reviews
Number of ratings712 — better
Update frequencyEvery 5 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13
Further details — not scored
Size61 MB308 MB
Age rating4+4+
DeveloperGustav Scholda4Pockets.com

Customer experience

GSDSP Quantum Granulator

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

FontStack

All ratings12 ratings
Positive83.3%
Neutral8.3%
Negative8.3%
Written reviews8 reviews
Positive75.0%
Neutral12.5%
Negative12.5%

In-app purchases

None

GSDSP Quantum Granulator

No in-app purchases

None

FontStack

No in-app purchases

Questions

Is GSDSP Quantum Granulator free?
GSDSP Quantum Granulator costs $14.99, with no in-app purchases.
Is FontStack free?
FontStack costs $14.99, with no in-app purchases.
Which has better reviews, GSDSP Quantum Granulator or FontStack?
GSDSP Quantum Granulator is rated higher. GSDSP Quantum Granulator averages 5.0 out of 5 from 7 ratings, while FontStack averages 4.5 from 12 ratings.
Do GSDSP Quantum Granulator or FontStack have ads?
Neither GSDSP Quantum Granulator nor FontStack shows ads.
Which is updated more often, GSDSP Quantum Granulator or FontStack?
GSDSP Quantum Granulator ships an update every 5 weeks, and FontStack every 2 weeks. Most recently, GSDSP Quantum Granulator was updated on September 22, 2026 and FontStack on September 19, 2026.

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