# mKer vs GSDSP Quantum Delay

The clearest difference is price: mKer at $3.99 against GSDSP Quantum Delay's $14.99. GSDSP Quantum Delay's advantage is review sentiment (100% vs 64%) and rating (4.8 vs 4.5). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

mKer costs $3.99 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 4.5. Both are backed by a comparable volume of ratings — 22 and 17 respectively. Written reviews point the same way: 64% of mKer's written reviews are positive against 100% of GSDSP Quantum Delay's.

mKer ships an update every 3 weeks, GSDSP Quantum Delay every 5 weeks. The most recent releases landed on October 6, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | mKer | GSDSP Quantum Delay |
| --- | --- | --- |
| Price | **$3.99** | $14.99 |
| Rating | [4.5 (22 ratings)](https://appshunter.io/ios/app/mker/id1635296839/reviews) | **[4.8 (17 ratings)](https://appshunter.io/ios/app/gsdsp-quantum-delay/id6469328297/reviews)** |
| Number of ratings | **22** | 17 |
| Positive reviews | 63.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | Paid | Paid |
| Size | 57 MB | 94 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Axart Labs OU](https://appshunter.io/developer/1814434331) | [Gustav Scholda](https://appshunter.io/developer/1642323227) |

## What reviewers say

### mKer

[App page](https://appshunter.io/ios/app/mker/id1635296839)

A versatile MIDI step sequencer designed for music creation. It offers multiple outputs, extensive pattern and lane customization, and advanced step editing. Best used within an AUv3 host app for sound generation.

**Highlights:** 8 MIDI outputs, 64 Patterns with 16 Lanes each, Customizable Steps and Step Size per Lane, Advanced Step Parameters (Pitch, Velocity, Probability, etc.), Flexible Editor with Step Entry Keyboard, 32 Clips with Repeat Functionality, Performance Tab with Assignable Sliders and Morphing

**Features:** macOS Compatibility

**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 mKer free?

mKer costs $3.99, 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, mKer or GSDSP Quantum Delay?

GSDSP Quantum Delay is rated higher. mKer averages 4.5 out of 5 from 22 ratings, while GSDSP Quantum Delay averages 4.8 from 17 ratings.

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

Neither mKer nor GSDSP Quantum Delay shows ads.

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

mKer ships an update every 3 weeks, and GSDSP Quantum Delay every 5 weeks. Most recently, mKer was updated on October 6, 2026 and GSDSP Quantum Delay on September 22, 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.*