# KQ Sampei Legacy vs GSDSP Quantum Filter

The clearest difference is update cadence: KQ Sampei Legacy at every 2 weeks against GSDSP Quantum Filter's every 6 weeks. KQ Sampei Legacy also leads on price ($11.99 vs $14.99) and ratings volume (19 vs 3). On rating, review sentiment, ads and in-app purchases there is nothing between them.

KQ Sampei Legacy costs $11.99 and GSDSP Quantum Filter $14.99 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 — 4.9 for KQ Sampei Legacy against 5.0 for GSDSP Quantum Filter. That said, the two scores are not equally well evidenced: KQ Sampei Legacy has 19 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 94% of KQ Sampei Legacy's written reviews are positive against 100% of GSDSP Quantum Filter's.

KQ Sampei Legacy ships an update every 2 weeks, GSDSP Quantum Filter every 6 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | KQ Sampei Legacy | GSDSP Quantum Filter |
| --- | --- | --- |
| Price | **$11.99** | $14.99 |
| Rating | [4.9 (19 ratings)](https://appshunter.io/ios/app/kq-sampei-legacy/id1626784865/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/gsdsp-quantum-filter/id6498711920/reviews)** |
| Number of ratings | **19** | 3 |
| Positive reviews | 94.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 6 weeks |
| Monetization | Paid | Paid |
| Size | 15 MB | 77 MB |
| Requires iOS | **12.4** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ryouta Kira](https://appshunter.io/developer/862984358) | [Gustav Scholda](https://appshunter.io/developer/1642323227) |

## What reviewers say

### KQ Sampei Legacy

[App page](https://appshunter.io/ios/app/kq-sampei-legacy/id1626784865)

This sampler synthesizer allows users to customize sound sets using various formats like Sound Font and DLS. It supports MIDI messages, includes a MIDI file player, and can be used as a plugin with other music apps. Micro-tuning and external storage are also supported.

**Highlights:** Customizable sound sets (Sound Font, DLS), Multi-timbral synthesis, MIDI message support (GM, GS, XG, MPE), MIDI File Player, Audio Unit v3 and Inter-App Audio plugin support, Micro-tuning support, External MIDI device compatibility

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is KQ Sampei Legacy free?

KQ Sampei Legacy costs $11.99, with no in-app purchases.

### Is GSDSP Quantum Filter free?

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

### Which has better reviews, KQ Sampei Legacy or GSDSP Quantum Filter?

GSDSP Quantum Filter is rated higher. KQ Sampei Legacy averages 4.9 out of 5 from 19 ratings, while GSDSP Quantum Filter averages 5.0 from 3 ratings.

### Do KQ Sampei Legacy or GSDSP Quantum Filter have ads?

Neither KQ Sampei Legacy nor GSDSP Quantum Filter shows ads.

### Which is updated more often, KQ Sampei Legacy or GSDSP Quantum Filter?

KQ Sampei Legacy ships an update every 2 weeks, and GSDSP Quantum Filter every 6 weeks. Most recently, KQ Sampei Legacy was updated on October 24, 2026 and GSDSP Quantum Filter on October 24, 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.*