Comparison

GRFX vs L12X Solid State Amplifier

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

Head to head
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.

About

L12X Solid State Amplifier

This app offers an analog simulation of a classic solid-state guitar amplifier, enhanced with extra channels and a contour knob for versatile tone shaping. It includes an integrated cabinet simulator with a high-quality impulse response for authentic sound.

Highlights
  • Analog simulation of Marshall Lead 12
  • Clean and Metal channels
  • Contour knob for tone shaping
  • Boost overdrive stage
  • Integrated Cab Simulator
  • Marshall cabinet IR with Celestion V30
Features
Read full description

L12X is an analog simulation inspired by the Marshall® Lead 12™ solid state amplifier of the late ‘80s. The original circuit has been modified by adding two additional channels (Clean and Metal), a Contour knob (to get a more scooped tone) and an additional Boost overdrive stage. An integrated Cab Simulator is loaded with a Marshall® cabinet IR featuring Celestion® V30 cones.

Screenshots

GRFX4 screens
L12X Solid State Amplifier3 screens

Verdict

The call

The clearest difference is price: L12X Solid State Amplifier at Free against GRFX's $6.99. L12X Solid State Amplifier also leads on update cadence (weekly vs monthly) and iOS requirement (14.0 vs 17.0). GRFX's advantage is review sentiment (78% vs 50%). 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

L12X Solid State Amplifier is free to download; GRFX costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

GRFX holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 11 and 9 respectively. Written reviews point the same way: 78% of GRFX's written reviews are positive against 50% of L12X Solid State Amplifier's.

UpkeepUpdate frequency

GRFX ships an update monthly, L12X Solid State Amplifier weekly. The most recent releases landed on October 12, 2026 and September 26, 2026 respectively.

Scorecard5 real differences · 5 level
GRFX versus L12X Solid State Amplifier: the parameters behind the verdict, then further details
ParameterGRFXL12X Solid State Amplifier
Price$6.99Free — better
Rating4.6 (11 ratings) — better4.4 (9 ratings)
Positive reviews77.8% of reviews — better50.0% of reviews
Number of ratings11 — better9
Update frequencyMonthlyWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.014.0 — better
Further details — not scored
Size117 MB30 MB
Age rating4+4+
DeveloperImaginando LdaAudiority Srl

Customer experience

GRFX

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

L12X Solid State Amplifier

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

GRFX

No in-app purchases

None

L12X Solid State Amplifier

No in-app purchases

Questions

Is GRFX free?
GRFX costs $6.99, with no in-app purchases.
Is L12X Solid State Amplifier free?
L12X Solid State Amplifier is free to download, with no in-app purchases.
Which has better reviews, GRFX or L12X Solid State Amplifier?
GRFX is rated higher. GRFX averages 4.6 out of 5 from 11 ratings, while L12X Solid State Amplifier averages 4.4 from 9 ratings.
Do GRFX or L12X Solid State Amplifier have ads?
Neither GRFX nor L12X Solid State Amplifier shows ads.
Which is updated more often, GRFX or L12X Solid State Amplifier?
GRFX ships an update monthly, and L12X Solid State Amplifier weekly. Most recently, GRFX was updated on October 12, 2026 and L12X Solid State Amplifier on September 26, 2026.

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