# GSDSP Quantum Filter vs mididelay

The clearest difference is price: mididelay at $4.99 against GSDSP Quantum Filter's $14.99. GSDSP Quantum Filter's advantage is update cadence (every 5 weeks vs every 10 months) and iOS requirement (12.0 vs 15.6). On rating, review sentiment, ratings volume and ads there is nothing between them.

GSDSP Quantum Filter costs $14.99 and mididelay $4.99 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 — 5.0 for GSDSP Quantum Filter against 5.0 for mididelay. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

GSDSP Quantum Filter ships an update every 5 weeks, mididelay every 10 months. The most recent releases landed on September 22, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | GSDSP Quantum Filter | mididelay |
| --- | --- | --- |
| Price | $14.99 | **$4.99** |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/gsdsp-quantum-filter/id6498711920/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/mididelay/id6505042226/reviews) |
| Number of ratings | 3 | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 10 months |
| Monetization | Paid | Paid |
| Size | 77 MB | 9 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gustav Scholda](https://appshunter.io/developer/1642323227) | [Alexey Nadzharov](https://appshunter.io/developer/729549192) |

## What reviewers say

### GSDSP Quantum Filter

[App page](https://appshunter.io/ios/app/gsdsp-quantum-filter/id6498711920)

This audio effect plugin offers analog-modeled filters with flexible routing and dynamic modulation for creative sound design. It provides extensive control over tone shaping and complex filtering with various filter types and configurations.

**Highlights:** Analog-modelled filters, 11 filter modes, Series and parallel routing, Dynamic modulation support, Stereo and dual mono modes, MIDI control integration

**Features:** Vision Pro support

**In-app purchases:** none


### mididelay

[App page](https://appshunter.io/ios/app/mididelay/id6505042226)

This app applies traditional delay effects to MIDI data, allowing for complex sound manipulation. It offers multiple independent delay lines, various MIDI message processing, and customizable feedback chains with built-in effects. Organize lines sequentially or in parallel for unique sonic textures.

**Highlights:** 8 independent delay lines with feedback, Processes MIDI notes, CC, aftertouch, pressure, pitch bend, Customizable feedback modes (average, min, max), Sequential and parallel delay line algorithms, Scale quantize, pitch, and velocity randomization, 3 independent scenes with cross-fading, Standalone and AUv3 support

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is GSDSP Quantum Filter free?

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

### Is mididelay free?

mididelay costs $4.99, with no in-app purchases.

### Which has better reviews, GSDSP Quantum Filter or mididelay?

GSDSP Quantum Filter and mididelay are both rated 5.0 out of 5 on the App Store, from 3 and 3 ratings respectively.

### Do GSDSP Quantum Filter or mididelay have ads?

Neither GSDSP Quantum Filter nor mididelay shows ads.

### Which is updated more often, GSDSP Quantum Filter or mididelay?

GSDSP Quantum Filter ships an update every 5 weeks, and mididelay every 10 months. Most recently, GSDSP Quantum Filter was updated on September 22, 2026 and mididelay on September 9, 2026.

---

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