Comparison

FontStack vs GRFX

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

Head to head
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.

About

GRFX

Transform ordinary audio into unique sonic textures, evolving soundscapes, and rhythmic glitches. This app offers precise control over sound manipulation with a unique pitch controller, multiple LFOs, and a flexible multi-effect chain. Create complex and immersive audio transformations in real-time.

Highlights
  • Granular engine for textures and rhythms
  • Harmonic Triangle pitch controller
  • Multi-effect chain with probabilistic routing
  • Four self-modulating LFOs
  • Real-time audio sculpting
  • AUv3 plugin and standalone app
Features
Read full description

GRFX is a powerful and creative granular effects processor that turns ordinary audio into extraordinary sonic landscapes. Slice your sound into grains and reshape them into evolving textures, shimmering chords, rhythmic glitches, haunting drones, and more. At the heart of GRFX is the Harmonic Triangle – an intuitive 3-way pitch controller that lets you morph simple tones into lush pads, arpeggiated patterns, or abstract gestures. Whether you’re aiming for organic soundscapes or synchronized stutters, GRFX gives you precise control over the flow of grains and modulation. Build complexity with four self-modulating LFOs, a multi-effect chain with probabilistic routing, and an elegant drag-and-drop modulation system. Shape your sound, modulate nearly every parameter, and sculpt immersive audio transformations in real time. Key Features: - Granular engine for creating textures, rhythms, chords, glitches, drones, ambiences, and more - Harmonic Triangle for 3-way pitch control, detuning, and microtonality - Built-in Chord Selector with 32 triads for instant harmonic richness - Grain envelope shaping for plucky, smooth, or abrupt grains - Buffer size, division, sync, and freeze controls - Rhythmic synchronization for tempo-synced effects and patterns - 4 LFOs with self-modulation and drag-and-drop assignment - Modulation panel & view mode for streamlined modulation management - 2 Multi-Effect slots (Filter, Distortion, Delay, Peak EQ, Chorus, Phaser, Bitcrusher, Reverb) with probability-based routing - Dedicated Send FX with Delay and Reverb in series or parallel mode - Flexible mixer section for sculpting wet/dry balance and routing AUv3 Audio Unit plugin – requires an AUv3-compatible host app such as Logic Pro, GarageBand, AUM, or Cubasis. Standalone version included.

Screenshots

FontStack4 screens
GRFX4 screens

Verdict

The call

The clearest difference is price: GRFX at $6.99 against FontStack's $14.99. FontStack's advantage is update cadence (every 2 weeks vs monthly) and iOS requirement (13 vs 17.0). On rating, review sentiment, ratings volume and ads 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

FontStack costs $14.99 and GRFX $6.99 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 — 4.5 for FontStack against 4.6 for GRFX. Both are backed by a comparable volume of ratings — 12 and 11 respectively. Written reviews are what separate them: 75% of FontStack's written reviews are positive against 78% of GRFX's.

UpkeepUpdate frequency

FontStack ships an update every 2 weeks, GRFX monthly. The most recent releases landed on September 19, 2026 and September 9, 2026 respectively.

Scorecard3 real differences · 7 level
FontStack versus GRFX: the parameters behind the verdict, then further details
ParameterFontStackGRFX
Price$14.99$6.99 — better
Rating4.5 (12 ratings)4.6 (11 ratings) — better
Positive reviews75.0% of reviews77.8% of reviews — better
Number of ratings12 — better11
Update frequencyEvery 2 weeks — betterMonthly
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13 — better17.0
Further details — not scored
Size308 MB117 MB
Age rating4+4+
Developer4Pockets.comImaginando Lda

Customer experience

FontStack

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

GRFX

All ratings11 ratings
Positive90.9%
Neutral0.0%
Negative9.1%
Written reviews9 reviews
Positive77.8%
Neutral0.0%
Negative22.2%

In-app purchases

None

FontStack

No in-app purchases

None

GRFX

No in-app purchases

Questions

Is FontStack free?
FontStack costs $14.99, with no in-app purchases.
Is GRFX free?
GRFX costs $6.99, with no in-app purchases.
Which has better reviews, FontStack or GRFX?
GRFX is rated higher. FontStack averages 4.5 out of 5 from 12 ratings, while GRFX averages 4.6 from 11 ratings.
Do FontStack or GRFX have ads?
Neither FontStack nor GRFX shows ads.
Which is updated more often, FontStack or GRFX?
FontStack ships an update every 2 weeks, and GRFX monthly. Most recently, FontStack was updated on September 19, 2026 and GRFX on September 9, 2026.

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