# GSDSP Quantum Delay vs jAmp Doubler

The clearest difference is price: jAmp Doubler at Free against GSDSP Quantum Delay's $14.99. jAmp Doubler also leads on update cadence (every 9 days vs every 6 weeks). GSDSP Quantum Delay's advantage is ratings volume (17 vs 4). On rating, review sentiment, ads and in-app purchases there is nothing between them.

jAmp Doubler is free to download; GSDSP Quantum Delay costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

jAmp Doubler holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 17 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

GSDSP Quantum Delay ships an update every 6 weeks, jAmp Doubler every 9 days. The most recent releases landed on October 27, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | GSDSP Quantum Delay | jAmp Doubler |
| --- | --- | --- |
| Price | $14.99 | **Free** |
| Rating | [4.8 (17 ratings)](https://appshunter.io/ios/app/gsdsp-quantum-delay/id6469328297/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/jamp-doubler/id6475082851/reviews)** |
| Number of ratings | **17** | 4 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 9 days** |
| Monetization | Paid | **Free** |
| Size | 94 MB | 6 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Gustav Scholda](https://appshunter.io/developer/1642323227) | [Jan Maes](https://appshunter.io/developer/1550506252) |

## 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


### jAmp Doubler

[App page](https://appshunter.io/ios/app/jamp-doubler/id6475082851)

This audio plugin creates a stereo effect by introducing a subtle delay to one audio channel. It offers precise control over the delay time and can be managed via MIDI. Ideal for enhancing mono audio sources with a wider soundstage.

**Highlights:** Stereo widening effect, Adjustable delay time (0-50 microseconds), MIDI control, AUv3 plugin format, Enhances mono audio

**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 jAmp Doubler free?

jAmp Doubler is free to download, with no in-app purchases.

### Which has better reviews, GSDSP Quantum Delay or jAmp Doubler?

jAmp Doubler is rated higher. GSDSP Quantum Delay averages 4.8 out of 5 from 17 ratings, while jAmp Doubler averages 5.0 from 4 ratings.

### Do GSDSP Quantum Delay or jAmp Doubler have ads?

Neither GSDSP Quantum Delay nor jAmp Doubler shows ads.

### Which is updated more often, GSDSP Quantum Delay or jAmp Doubler?

GSDSP Quantum Delay ships an update every 6 weeks, and jAmp Doubler every 9 days. Most recently, GSDSP Quantum Delay was updated on October 27, 2026 and jAmp Doubler on October 12, 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.*