# 501 Chorus Echo vs GSDSP Quantum Distortion

The clearest difference is review sentiment: GSDSP Quantum Distortion at 100% against 501 Chorus Echo's 0%. GSDSP Quantum Distortion also leads on rating (5.0 vs 4.5) and update cadence (every 5 weeks vs every 17 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

501 Chorus Echo costs $14.99 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 4.5. Both are backed by a comparable volume of ratings — 8 and 10 respectively. Written reviews point the same way: 0% of 501 Chorus Echo's written reviews are positive against 100% of GSDSP Quantum Distortion's.

501 Chorus Echo ships an update every 17 months, GSDSP Quantum Distortion every 5 weeks. The most recent releases landed on October 13, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 501 Chorus Echo | GSDSP Quantum Distortion |
| --- | --- | --- |
| Price | $14.99 | $14.99 |
| Rating | [4.5 (8 ratings)](https://appshunter.io/ios/app/501-chorus-echo/id6473418769/reviews) | **[5.0 (10 ratings)](https://appshunter.io/ios/app/gsdsp-quantum-distortion/id6476145487/reviews)** |
| Number of ratings | 8 | **10** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 5 weeks** |
| Monetization | Paid | Paid |
| Size | 23 MB | 80 MB |
| Requires iOS | 15 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nembrini Audio](https://appshunter.io/developer/1493296895) | [Gustav Scholda](https://appshunter.io/developer/1642323227) |

## What reviewers say

### 501 Chorus Echo

[App page](https://appshunter.io/ios/app/501-chorus-echo/id6473418769)

This audio plugin meticulously models the iconic Roland RE-501 Chorus Echo, offering authentic analog warmth with modern digital flexibility. It provides producers with classic tape delay, BBD chorus, and spring reverb sounds, enhanced by DAW tempo sync and expanded controls for any music genre.

**Highlights:** Authentic analog sound reproduction, Extended creative control with DAW sync, Intuitive user interface, Versatile for any music genre, Independent SOS timings, Linear preamp option

**Features:** Vision Pro support

**In-app purchases:** none


### GSDSP Quantum Distortion

[App page](https://appshunter.io/ios/app/gsdsp-quantum-distortion/id6476145487)

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:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 501 Chorus Echo free?

501 Chorus Echo costs $14.99, 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, 501 Chorus Echo or GSDSP Quantum Distortion?

GSDSP Quantum Distortion is rated higher. 501 Chorus Echo averages 4.5 out of 5 from 8 ratings, while GSDSP Quantum Distortion averages 5.0 from 10 ratings.

### Do 501 Chorus Echo or GSDSP Quantum Distortion have ads?

Neither 501 Chorus Echo nor GSDSP Quantum Distortion shows ads.

### Which is updated more often, 501 Chorus Echo or GSDSP Quantum Distortion?

501 Chorus Echo ships an update every 17 months, and GSDSP Quantum Distortion every 5 weeks. Most recently, 501 Chorus Echo was updated on October 13, 2026 and GSDSP Quantum Distortion on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*