Stellr vs GSDSP Quantum Distortion
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | Stellr | GSDSP Quantum Distortion |
|---|---|---|
| Price | $4.99 — better | $14.99 |
| Rating | 3.4 (9 ratings) | 5.0 (10 ratings) — better |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 9 | 10 — better |
| Update frequency | Every 40 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 26 MB | 80 MB |
| Age rating | 4+ | 4+ |
| Developer | BACKPULLVER SOFTWARE LTD OOD | Gustav Scholda |
Customer experience
Stellr
GSDSP Quantum Distortion
In-app purchases
Stellr
No in-app purchases
GSDSP Quantum Distortion
No in-app purchases
Questions
Is Stellr free?
Is GSDSP Quantum Distortion free?
Which has better reviews, Stellr or GSDSP Quantum Distortion?
Do Stellr or GSDSP Quantum Distortion have ads?
Which is updated more often, Stellr or GSDSP Quantum Distortion?
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