Comparison

GSDSP Quantum Distortion vs NotePulse

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

Head to head
About

GSDSP Quantum Distortion

Explore four distinct distortion effects—Saturation, BitCrush, Ring Modulation, and Downsampling—blended and controlled via an intuitive XY pad. Shape harmonics, reduce digital resolution, introduce inharmonic motion, and create classic digital degradation for unique audio textures.

Highlights
  • Four distortion algorithms (Saturation, BitCrush, Ring Modulation, Downsampling)
  • Intuitive XY pad for blending effects
  • Custom waveshaping saturation
  • BitWarp for tonal variation
  • Tunable oscillator for ring modulation
  • Adjustable downsampling rate and jitter
  • AUv3 audio effect plugin
Features
Read full description

Four complementary distortion algorithms — Saturation, BitCrush, Ring Modulation, and Downsampling — blended and shaped through an intuitive XY pad. Saturation Shape harmonics using Quantum Distortion’s custom waveshaping saturation. Adjust Drive to set the intensity from subtle warmth to strong coloration, and use Asymmetry to introduce controlled even-harmonic emphasis of vintage tube characteristics. BitCrush Reduce digital resolution using BitCrush and reshape the crushed signal with BitWarp, which bends the quantization curve for additional tonal variation. This combination allows precise control over both the amount of reduction and the character of the resulting digital artifacts. Ring Modulation Introduce inharmonic motion using ring modulation, generated by multiplying the input with a tunable oscillator. Adjust frequency and amount in real time to create anything from light metallic shading to dense, shifting sidebands. Downsampling Lower the sample rate using Downsampling, reducing temporal resolution for classic digital degradation effects. Set the rate down to 200 Hz or introduce Jitter for controlled randomness, adding instability and movement to the downsampled signal. XY Pad Blending Navigate between the four distortion algorithms using the XY pad, allowing smooth transitions or static blends across the processing modes. The background updates to reflect the current region, providing clear visual feedback while exploring hybrid distortion shapes and interactions. Quantum Distortion 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

NotePulse

Features
Read full description

NotePulse transforms MIDI files into an interactive visual learning experience, helping you connect the music you hear with piano keys and traditional musical notation. Watch notes approach a full 88-key piano keyboard in the synchronized Notes view, or switch to the Live Grand Staff to follow the performance as written music. Keyboard and Score modes help you understand where each note belongs on both the staff and the instrument. Features include: • Synchronized MIDI playback, animated notes, piano keyboard, and grand staff • Live Grand Staff with Keyboard and Score viewing modes • Multi-track playback using SoundFont instruments • General MIDI instrument playback and per-track instrument selection • Adjustable playback speed for focused practice • A–B looping for repeating difficult sections • Track controls for mute, solo, volume, pan, transpose, color, and instrument selection • Left- and right-hand guidance • Score quantization and adjustable staff presentation • Support for user-selected MIDI and compatible SoundFont files • Online MIDI catalog with downloadable songs for offline use • Downloadable NotePulse Sound Library • Session import and export • Adaptive layouts for iPhone and iPad • Built-in starter music for getting started immediately NotePulse is designed for musicians, students, educators, and anyone interested in exploring how MIDI performances translate into piano movement and traditional musical notation. Import your own MIDI files through the Files app, explore downloadable music from the NotePulse catalog, or use the included starter collection. NotePulse remembers your practice settings, track configuration, visualization preferences, instrument selections, loops, and playback position for individual MIDI files. Your imported MIDI, SoundFont, and session files are processed locally on your device. Online catalog content and the NotePulse Sound Library are downloaded only when needed. No account is required. See the Music. Feel the Pulse.

Screenshots

GSDSP Quantum Distortion3 screens
NotePulse4 screens

Verdict

The call

The clearest difference is price: NotePulse at $0.99 against GSDSP Quantum Distortion's $14.99. NotePulse also leads on update cadence (every 10 days vs every 5 weeks). GSDSP Quantum Distortion's advantage is iOS requirement (13.0 vs 17.0). On ads, in-app purchases 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 Quantum Distortion costs $14.99 and NotePulse $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

GSDSP Quantum Distortion ships an update every 5 weeks, NotePulse every 10 days. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

Scorecard3 real differences · 7 level
GSDSP Quantum Distortion versus NotePulse: the parameters behind the verdict, then further details
ParameterGSDSP Quantum DistortionNotePulse
Price$14.99$0.99 — better
Rating5.0 (10 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings10 — better—
Update frequencyEvery 5 weeksEvery 10 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size80 MB5 MB
Age rating4+4+
DeveloperGustav ScholdaNoorcon Inc.

In-app purchases

None

GSDSP Quantum Distortion

No in-app purchases

None

NotePulse

No in-app purchases

Questions

Is GSDSP Quantum Distortion free?
GSDSP Quantum Distortion costs $14.99, with no in-app purchases.
Is NotePulse free?
NotePulse costs $0.99, with no in-app purchases.
Do GSDSP Quantum Distortion or NotePulse have ads?
Neither GSDSP Quantum Distortion nor NotePulse shows ads.
Which is updated more often, GSDSP Quantum Distortion or NotePulse?
GSDSP Quantum Distortion ships an update every 5 weeks, and NotePulse every 10 days. Most recently, GSDSP Quantum Distortion was updated on October 24, 2026 and NotePulse on October 7, 2026.

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