# Shoom Synthesizer vs GSDSP Quantum Delay

The clearest difference is price: Shoom Synthesizer at $6.99 against GSDSP Quantum Delay's $14.99. Shoom Synthesizer also leads on ratings volume (64 vs 17) and iOS requirement (9.0 vs 13.0). GSDSP Quantum Delay's advantage is update cadence (every 6 weeks vs every 13 months) and review sentiment (100% vs 87%). On rating, ads, in-app purchases and monetization model there is nothing between them.

Shoom Synthesizer costs $6.99 and GSDSP Quantum Delay $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Shoom Synthesizer against 4.8 for GSDSP Quantum Delay. Both are backed by a comparable volume of ratings — 64 and 17 respectively. Written reviews are what separate them: 87% of Shoom Synthesizer's written reviews are positive against 100% of GSDSP Quantum Delay's.

Shoom Synthesizer ships an update every 13 months, GSDSP Quantum Delay every 6 weeks. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Shoom Synthesizer | GSDSP Quantum Delay |
| --- | --- | --- |
| Price | **$6.99** | $14.99 |
| Rating | **[4.9 (64 ratings)](https://appshunter.io/ios/app/shoom-synthesizer/id1086363141/reviews)** | [4.8 (17 ratings)](https://appshunter.io/ios/app/gsdsp-quantum-delay/id6469328297/reviews) |
| Number of ratings | **64** | 17 |
| Positive reviews | 86.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 6 weeks** |
| Monetization | Paid | Paid |
| Size | 16 MB | 94 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yuri Turov](https://appshunter.io/developer/720810462) | [Gustav Scholda](https://appshunter.io/developer/1642323227) |

## What reviewers say

### Shoom Synthesizer

[App page](https://appshunter.io/ios/app/shoom-synthesizer/id1086363141)

This app is an audio playground featuring three identical synthesizers controlled by an expressive XY pad. It offers a wide pitch range and supports various scales, including microtonal options. Advanced features include MIDI input, extensive modulation sources, and built-in effects for creative sound design.

**Highlights:** Three independent synthesizers, Expressive XY pad control, Microtonal and xenharmonic scale support, MIDI note input (MPE), Extensive modulation sources, Built-in stereo delay and reverb

**In-app purchases:** none

**What reviewers like**

- 🎶 Fantastic and unique sounds
- 💡 Highly expressive and versatile
- 🎨 Intuitive and inspiring UI
- 🚀 Great for experimental and ambient music
- 🎹 Excellent for live performance

**What reviewers complain about**

- ❓ Steep learning curve for some
- 🐌 Lack of frequent updates
- 🐛 Occasional bugs reported

**Reported bugs**

- Bugs encountered
- Slight sensitivity issues
- Quality loss when recording to AudioShare
- Problem with background audio

**Requested features**

- AUV3 support
- Multichannel AUV3 version
- MIDI out functionality
- MIDI note input
- Record movements feature


### 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


## Frequently asked questions

### Is Shoom Synthesizer free?

Shoom Synthesizer costs $6.99, with no in-app purchases.

### Is GSDSP Quantum Delay free?

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

### Which has better reviews, Shoom Synthesizer or GSDSP Quantum Delay?

Shoom Synthesizer is rated higher. Shoom Synthesizer averages 4.9 out of 5 from 64 ratings, while GSDSP Quantum Delay averages 4.8 from 17 ratings.

### Do Shoom Synthesizer or GSDSP Quantum Delay have ads?

Neither Shoom Synthesizer nor GSDSP Quantum Delay shows ads.

### Which is updated more often, Shoom Synthesizer or GSDSP Quantum Delay?

Shoom Synthesizer ships an update every 13 months, and GSDSP Quantum Delay every 6 weeks. Most recently, Shoom Synthesizer was updated on October 29, 2026 and GSDSP Quantum Delay on October 27, 2026.

---

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