# GSDSP Quantum Delay vs Kalimba Keys

The clearest difference is price: Kalimba Keys at $4.99 against GSDSP Quantum Delay's $14.99. Kalimba Keys also leads on rating (5.0 vs 4.8). GSDSP Quantum Delay's advantage is update cadence (every 5 weeks vs every 6 months). On review sentiment, ratings volume, ads and in-app purchases there is nothing between them.

GSDSP Quantum Delay costs $14.99 and Kalimba Keys $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Kalimba Keys holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 17 and 14 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

GSDSP Quantum Delay ships an update every 5 weeks, Kalimba Keys every 6 months. The most recent releases landed on September 22, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | GSDSP Quantum Delay | Kalimba Keys |
| --- | --- | --- |
| Price | $14.99 | **$4.99** |
| Rating | [4.8 (17 ratings)](https://appshunter.io/ios/app/gsdsp-quantum-delay/id6469328297/reviews) | **[5.0 (14 ratings)](https://appshunter.io/ios/app/kalimba-keys/id6474580189/reviews)** |
| Number of ratings | **17** | 14 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 6 months |
| Monetization | Paid | Paid |
| Size | 94 MB | 112 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gustav Scholda](https://appshunter.io/developer/1642323227) | [OSC Audio](https://appshunter.io/developer/1693533681) |

## 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


### Kalimba Keys

[App page](https://appshunter.io/ios/app/kalimba-keys/id6474580189)

This app offers a realistic and expressive Kalimba instrument experience with studio-quality sound. It features detailed sampling, a variety of built-in effects, and cross-platform preset management for seamless creativity.

**Highlights:** Individually-sampled Kalimba notes, Multiple Kalimba sound variations, Modulation and Space & Time FX, Adjustable effects order, 35 included presets, Cross-platform preset sharing, Standalone app and AUv3 compatibility

**Features:** macOS Compatibility, 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 Kalimba Keys free?

Kalimba Keys costs $4.99, with no in-app purchases.

### Which has better reviews, GSDSP Quantum Delay or Kalimba Keys?

Kalimba Keys is rated higher. GSDSP Quantum Delay averages 4.8 out of 5 from 17 ratings, while Kalimba Keys averages 5.0 from 14 ratings.

### Do GSDSP Quantum Delay or Kalimba Keys have ads?

Neither GSDSP Quantum Delay nor Kalimba Keys shows ads.

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

GSDSP Quantum Delay ships an update every 5 weeks, and Kalimba Keys every 6 months. Most recently, GSDSP Quantum Delay was updated on September 22, 2026 and Kalimba Keys on September 7, 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.*