Comparison

GSDSP MagicFusion vs sumFX

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

Head to head
About

GSDSP MagicFusion

This advanced audio effect plugin offers precise spectral fusion and multi-curve vocoding. It allows users to extract spectral characteristics from one audio source and apply them to another, enabling detailed transformations from subtle shading to extreme effects.

Highlights
  • Multi-curve spectral vocoding
  • Frequency-domain processing
  • Independent fusion amounts per frequency
  • Dynamic response control
  • Formant shifting
  • AUv3 audio effect plugin
Features
Read full description

The world’s first frequency-domain vocoder with multi-curve control and precision spectral fusion. Multi-Curve Spectral Vocoding MagicFusion is a multi-curve spectral vocoder workstation operating entirely in the frequency domain. Instead of relying on bandpass filters and envelope followers, it extracts the spectral characteristics of a modulator and applies them to a carrier, enabling precise, customizable vocoding across the entire spectrum. Apply independent fusion amounts per frequency or frequency range, then mix, modulate, and spread them to create anything from subtle vocal shading to extreme spectral transformations. Vocoder Signal Flow MagicFusion requires two audio inputs: the carrier (main input) and the modulator (sidechain). The plugin extracts the modulator’s spectral envelope and applies it to the carrier, creating a fused signal where both sources interact. This process provides clean, flexible control over the degree of spectral fusion and allows highly detailed shaping across the frequency spectrum. Dynamic Response & Formants Adjust the Smooth control to define how quickly the vocoder reacts, from fast, precise transitions to slower, more rounded movement. The Formant parameter shifts the spectral character of the modulator, while Detail adjusts the complexity of the filter response — from clean, intricate results to more organic, pumping behavior. MagicFusion 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

sumFX

This app is a versatile audio effects processor for musicians. It offers a modular design with multiple high-quality FX modules and customizable slots, allowing for quick creation of unique sounds. Focus on your music with intuitive controls and visual feedback.

Highlights
  • Modular multi-FX processor
  • 8 high-quality FX modules
  • 8 FX slots with Wet/Dry control
  • 2 LFOs per slot
  • 50+ cross-platform presets
  • Pre/post waveform view
Features
Read full description

sumFX is a modular multi-FX processor for Mac/PC and iOS. Designed with simplicity in mind, to help keep you focused on the music and the sum of your efforts. Packed with 8 high quality FX modules and an available 8 slots, each loaded with Wet/Dry control, Global Wet/Dry, and 2 LFOs per slot, creating new unique sounds is quick and easy. 50+ cross-platform slot & chain presets are included to get you to any sound you need quickly and we’ve packed in an easy to use pre/post waveform view to help keep you focused on the result of your FX. Modules: -syncDynamics - Multimode dynamic FX with BPM sync attack/release (Noise Gate, Expander, Compressor, Limiter) -stereoFilter - Stereo filter with link or individual channel controls (LPF12, HPF12, BPF12, LPF24, HPF24, BPF24, Notch, & Formant options). -variMod - Multimode modulation FX with stereo offset (Chorus, Flanger,  Vibrato, Phaser, Tremolo,  & Auto Pan) -EQuator - Full high quality EQ module (3 Parametric Bands, High/Low Shelf, & HPF/LPF). -frostReverb - Multi-Mode (Original, Plate, Spring, Room) Stereo Reverb.  -bucketDelay - Stereo Analog Style Delay with individual channel control. -variPitch - Stereo Pitch Shifter with 3X Modes (Doubler, Harmonizer, & Full Control) -powerPhase - Multimode Saturation, Utility Gain In/Out, Mono Maker, Channel msDelay, & Phase inverter.

Screenshots

GSDSP MagicFusion3 screens
sumFX3 screens

Verdict

The call

The clearest difference is review sentiment: GSDSP MagicFusion at 100% against sumFX's 55%. GSDSP MagicFusion also leads on rating (5.0 vs 4.4) and update cadence (every 5 weeks vs every 6 months). sumFX's advantage is price ($9.99 vs $29.99) and ratings volume (12 vs 4). On ads, in-app purchases, monetization model and device support 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 MagicFusion costs $29.99 and sumFX $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

GSDSP MagicFusion holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 4 and 12 respectively. Written reviews point the same way: 100% of GSDSP MagicFusion's written reviews are positive against 55% of sumFX's.

UpkeepUpdate frequency

GSDSP MagicFusion ships an update every 5 weeks, sumFX every 6 months. The most recent releases landed on September 22, 2026 and September 7, 2026 respectively.

Scorecard5 real differences · 5 level
GSDSP MagicFusion versus sumFX: the parameters behind the verdict, then further details
ParameterGSDSP MagicFusionsumFX
Price$29.99$9.99 — better
Rating5.0 (4 ratings) — better4.4 (12 ratings)
Positive reviews100.0% of reviews — better54.5% of reviews
Number of ratings412 — better
Update frequencyEvery 5 weeks — betterEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.012.0
Further details — not scored
Size68 MB44 MB
Age rating4+4+
DeveloperGustav ScholdaOSC Audio

Customer experience

GSDSP MagicFusion

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

sumFX

All ratings12 ratings
Positive83.3%
Neutral8.3%
Negative8.3%
Written reviews11 reviews
Positive54.5%
Neutral18.2%
Negative27.3%

In-app purchases

None

GSDSP MagicFusion

No in-app purchases

None

sumFX

No in-app purchases

Questions

Is GSDSP MagicFusion free?
GSDSP MagicFusion costs $29.99, with no in-app purchases.
Is sumFX free?
sumFX costs $9.99, with no in-app purchases.
Which has better reviews, GSDSP MagicFusion or sumFX?
GSDSP MagicFusion is rated higher. GSDSP MagicFusion averages 5.0 out of 5 from 4 ratings, while sumFX averages 4.4 from 12 ratings.
Do GSDSP MagicFusion or sumFX have ads?
Neither GSDSP MagicFusion nor sumFX shows ads.
Which is updated more often, GSDSP MagicFusion or sumFX?
GSDSP MagicFusion ships an update every 5 weeks, and sumFX every 6 months. Most recently, GSDSP MagicFusion was updated on September 22, 2026 and sumFX on September 7, 2026.

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