Comparison

mKer vs GSDSP Quantum Delay

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

mKer

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
Read full description

*** Note *** Although mKer can run as a stand-alone app, the recommended way to use it is as an AUv3 plugin from inside a suitable AU Host app that supports MIDI Processors such as AUM, Audiobus, Cubasis etc. Please also note that mKer is a MIDI app/plugin. That means that it does not produce sound itself - it needs to be connected to an audio source that can receive MIDI. mKer is a versatile, multi-output MIDI step sequencer with an extensive range of features. These include: - 8 MIDI outputs - 64 Patterns - 16 Lanes (aka tracks) per Pattern - Independent number of Steps (1-32) and Step Size (1/64-256 beats) per Lane per Pattern - Every step can play either a single note, an interval (2 notes) or a chord (3 or 4 notes) - Lane Step parameters: Play Cycles, Skip Cycles, Play Offset Cycles, Pitch, Velocity, Probability, Offset (can be used for ‘swing’ like effects), Repeat (rachet) and Gate - A flexible Editor that includes a step entry keyboard, parameter sliders and a variety of options and utilities designed for to make the workflow intuitive and fast - 32 Clips with 1-8 Steps per Clip, 1-128 repeats per step (every clip step has one pattern) - 3 Play Modes: Pattern, Clip, Sequence (all Clips) - A Performance tab with 10 fully assignable MIDI sliders, a 12-snapshot bank and morphing function between the snapshots... - MIDI step input and real-time recording - 12-track beat generator with six genres, density, intensity and GM beat mapping ... and more!

About

GSDSP Quantum Delay

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
Read full description

A vintage-inspired delay supercharged with deep modulation, flexible filtering, and creative timing that pushes echoes into new dimensions. Classic Delay, Reinvented Quantum Delay takes the charm of a vintage stereo delay and fuses it with our next-level modulation system. Switch between the warm character of Tape mode and the pristine clarity of Fade mode, lock to BPM (including 5-tuplets) or dial in precise times in milliseconds. Use the Fine control for subtle push-and-pull micro-timing — or modulate your delay lines in ways traditional delays could only dream of. Sculpted Echoes Shape your repeats with switchable lowpass, highpass, and bandpass filters placed directly in the feedback path. Add modulation to create evolving tones, gentle movement, or drifting, frequency-shifting echoes. From warm analog-style rolls to shimmering, swirling textures, it’s all there. Feedback with Precision Control your delay tail behavior using either traditional % feedback or our modern dB-per-second decay system — ideal for predictable, musical decay even when the feedback path becomes complex. Enable Crossfeed for classic ping-pong stereo bounce, or push into Over-Feedback to create dense, self-building echoes that drift toward infinity. Stereo or Dual Mono Every section of Quantum Delay — delay, filter, and feedback — can switch between stereo and dual mono modes. Create tight, controlled stereo images or break them apart for wide, offset, unpredictable spaces. Dual mono modulation unlocks complex stereo interplay and beautifully asymmetric echoes. Modulation Without Limits Quantum Delay integrates our advanced modulation system, letting you modulate nearly anything: delay time, filters, feedback parameters, stereo controls, and more. Use LFOs, Random Generators, 2D modulators, Envelope Followers, Macros, and even chaotic systems to push your echoes far beyond traditional delay behavior. Or use our parameter randomisation feature to explore the plugin’s sound at random. Quantum Delay is an AUv3 audio effect plugin compatible with Logic Pro, AUM, Cubasis, GarageBand and many more. A Desktop version is also available for Windows and macOS (VST3 / AU / AAX). More information here: https://gs-dsp.com/products

Screenshots

GSDSP Quantum Delay3 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
mKer versus GSDSP Quantum Delay: the parameters behind the verdict, then further details
ParametermKerGSDSP Quantum Delay
Price$3.99 — better$14.99
Rating4.5 (22 ratings)4.8 (17 ratings) — better
Positive reviews63.6% of reviews100.0% of reviews — better
Number of ratings22 — better17
Update frequencyEvery 3 weeks — betterEvery 5 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS13.012.0 — better
Further details — not scored
Size57 MB94 MB
Age rating4+4+
DeveloperAxart Labs OUGustav Scholda

Customer experience

mKer

All ratings20 ratings
Positive85.0%
Neutral5.0%
Negative10.0%
Written reviews11 reviews
Positive63.6%
Neutral9.1%
Negative27.3%

GSDSP Quantum Delay

All ratings17 ratings
Positive94.1%
Neutral0.0%
Negative5.9%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

mKer

No in-app purchases

None

GSDSP Quantum Delay

No in-app purchases

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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