# GSiRotary vs GSDSP Quantum Delay

The clearest difference is rating: GSDSP Quantum Delay at 4.8 against GSiRotary's 3.7. GSDSP Quantum Delay also leads on update cadence (every 6 weeks vs every 17 months) and price ($14.99 vs $19.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

GSiRotary costs $19.99 and GSDSP Quantum Delay $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 3.7. That said, the two scores are not equally well evidenced: GSDSP Quantum Delay has 17 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 80% of GSiRotary's written reviews are positive against 100% of GSDSP Quantum Delay's.

GSiRotary ships an update every 17 months, GSDSP Quantum Delay every 6 weeks. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | GSiRotary | GSDSP Quantum Delay |
| --- | --- | --- |
| Price | $19.99 | **$14.99** |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/gsirotary/id1644548509/reviews) | **[4.8 (17 ratings)](https://appshunter.io/ios/app/gsdsp-quantum-delay/id6469328297/reviews)** |
| Number of ratings | 3 | **17** |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 6 weeks** |
| Monetization | Paid | Paid |
| Size | 12 MB | 94 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Genuine Soundware](https://appshunter.io/developer/1560880481) | [Gustav Scholda](https://appshunter.io/developer/1642323227) |

## What reviewers say

### GSiRotary

[App page](https://appshunter.io/ios/app/gsirotary/id1644548509)

This AUv3 plugin emulates the iconic sound of Leslie rotary speakers for iPad. It offers detailed control over speeds, ramp times, balance, and microphone placement, along with built-in tube overdrive and reverb. Achieve authentic vintage speaker tones with low CPU impact.

**Highlights:** AUv3 plugin for compatible host apps, Emulates Leslie tube models (122, 147, etc.), Adjustable speeds for upper and lower speakers, Adjustable ramp up and down times, Adjustable balance between speakers, Adjustable microphone position, Built-in tube overdrive and digital reverb

**In-app purchases:** none


### 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 GSiRotary free?

GSiRotary costs $19.99, 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, GSiRotary or GSDSP Quantum Delay?

GSDSP Quantum Delay is rated higher. GSiRotary averages 3.7 out of 5 from 3 ratings, while GSDSP Quantum Delay averages 4.8 from 17 ratings.

### Do GSiRotary or GSDSP Quantum Delay have ads?

Neither GSiRotary nor GSDSP Quantum Delay shows ads.

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

GSiRotary ships an update every 17 months, and GSDSP Quantum Delay every 6 weeks. Most recently, GSiRotary was updated on October 24, 2026 and GSDSP Quantum Delay on October 27, 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.*