# GSDSP Quantum Delay vs 501 Chorus Echo

The clearest difference is review sentiment: GSDSP Quantum Delay at 100% against 501 Chorus Echo's 0%. GSDSP Quantum Delay also leads on update cadence (every 5 weeks vs every 17 months) and rating (4.8 vs 4.5). On price, ratings volume, ads and in-app purchases there is nothing between them.

GSDSP Quantum Delay costs $14.99 and 501 Chorus Echo $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

GSDSP Quantum Delay holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 17 and 8 respectively. Written reviews point the same way: 100% of GSDSP Quantum Delay's written reviews are positive against 0% of 501 Chorus Echo's.

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

## The numbers

| Metric | GSDSP Quantum Delay | 501 Chorus Echo |
| --- | --- | --- |
| Price | $14.99 | $14.99 |
| Rating | **[4.8 (17 ratings)](https://appshunter.io/ios/app/gsdsp-quantum-delay/id6469328297/reviews)** | [4.5 (8 ratings)](https://appshunter.io/ios/app/501-chorus-echo/id6473418769/reviews) |
| Number of ratings | **17** | 8 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 17 months |
| Monetization | Paid | Paid |
| Size | 94 MB | 23 MB |
| Requires iOS | **12.0** | 15 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gustav Scholda](https://appshunter.io/developer/1642323227) | [Nembrini Audio](https://appshunter.io/developer/1493296895) |

## What reviewers say

### GSDSP Quantum Delay

[App page](https://appshunter.io/ios/app/gsdsp-quantum-delay/id6469328297)

This app offers a vintage-inspired stereo delay effect with advanced modulation, flexible filtering, and precise timing controls. It allows users to sculpt unique echo textures, from warm analog sounds to complex, evolving soundscapes.

**Highlights:** Vintage-inspired stereo delay, Deep modulation system, Flexible filtering (LPF, HPF, BPF), Precise timing controls (BPM, ms), Switchable stereo/dual mono modes, Advanced modulation sources (LFO, Random, Envelope)

**Features:** Vision Pro support

**In-app purchases:** none


### 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


## Frequently asked questions

### Is GSDSP Quantum Delay free?

GSDSP Quantum Delay costs $14.99, with no in-app purchases.

### Is 501 Chorus Echo free?

501 Chorus Echo costs $14.99, with no in-app purchases.

### Which has better reviews, GSDSP Quantum Delay or 501 Chorus Echo?

GSDSP Quantum Delay is rated higher. GSDSP Quantum Delay averages 4.8 out of 5 from 17 ratings, while 501 Chorus Echo averages 4.5 from 8 ratings.

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

Neither GSDSP Quantum Delay nor 501 Chorus Echo shows ads.

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

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