Comparison

Stellr vs GSDSP Quantum Distortion

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

Head to head
About

Stellr

Create deep, ethereal ambiance with a pitch-shifter, dual delays, and reverb. Explore sonic possibilities with 15 presets, randomization, and parameter automation. Enhance your music with a new dimension of sound.

Highlights
  • Pitch shifter with fine-tuning or semitone snap
  • Two independent delays for complex feedback
  • LFO modulation and various reverb types
  • Pre-gain and dry/wet level control
  • Audio Unit Extension, Audiobus, Inter-App Audio support
  • 15 built-in presets with import/export
  • Realtime frequency spectrum visualizer
Features
Read full description

Stellr is a pitch-shifter/delay/reverb sound processor aimed to recreate the classic shimmer effect. It makes deep ethereal ambiance on top of your sound, providing you with a wide variety of sonic possibilities. Add a new dimension to your music. The effect features 20 ready to use presets which can be shared between devices as well as randomize button for endless variations. When loaded as Audio Unit effect, all parameters can be automated via host app. Stellr main features: – Pitch shifter which can be fine-tuned or snapped to semitone – Two separate delays for creating a complex feedback effect – LFO modulation and different types of reverb – Set pre-gain and dry/wet levels – Audio Unit Extension support – 20 built-in presets – Low-pass and High-pass filters – Ability to save and randomize parameters – Import and export of user presets – Realtime frequency spectrum visualizer

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

Screenshots

Stellr2 screens
GSDSP Quantum Distortion3 screens

Verdict

The call

The clearest difference is price: Stellr at $4.99 against GSDSP Quantum Distortion's $14.99. GSDSP Quantum Distortion's advantage is rating (5.0 vs 3.4) and review sentiment (100% vs 67%). On ratings volume, ads, in-app purchases and monetization model 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

Stellr costs $4.99 and GSDSP Quantum Distortion $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 Distortion holds the better App Store score, 5.0 against 3.4. Both are backed by a comparable volume of ratings — 9 and 10 respectively. Written reviews point the same way: 67% of Stellr's written reviews are positive against 100% of GSDSP Quantum Distortion's.

UpkeepUpdate frequency

Stellr ships an update every 40 months, GSDSP Quantum Distortion every 5 weeks. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
Stellr versus GSDSP Quantum Distortion: the parameters behind the verdict, then further details
ParameterStellrGSDSP Quantum Distortion
Price$4.99 — better$14.99
Rating3.4 (9 ratings)5.0 (10 ratings) — better
Positive reviews66.7% of reviews100.0% of reviews — better
Number of ratings910 — better
Update frequencyEvery 40 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size26 MB80 MB
Age rating4+4+
DeveloperBACKPULLVER SOFTWARE LTD OODGustav Scholda

Customer experience

Stellr

All ratings9 ratings
Positive55.6%
Neutral11.1%
Negative33.3%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

GSDSP Quantum Distortion

All ratings10 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Stellr

No in-app purchases

None

GSDSP Quantum Distortion

No in-app purchases

Questions

Is Stellr free?
Stellr costs $4.99, with no in-app purchases.
Is GSDSP Quantum Distortion free?
GSDSP Quantum Distortion costs $14.99, with no in-app purchases.
Which has better reviews, Stellr or GSDSP Quantum Distortion?
GSDSP Quantum Distortion is rated higher. Stellr averages 3.4 out of 5 from 9 ratings, while GSDSP Quantum Distortion averages 5.0 from 10 ratings.
Do Stellr or GSDSP Quantum Distortion have ads?
Neither Stellr nor GSDSP Quantum Distortion shows ads.
Which is updated more often, Stellr or GSDSP Quantum Distortion?
Stellr ships an update every 40 months, and GSDSP Quantum Distortion every 5 weeks. Most recently, Stellr was updated on October 19, 2026 and GSDSP Quantum Distortion on October 24, 2026.

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