# GSDSP Quantum Filter vs VAPolyWest

The clearest difference is update cadence: GSDSP Quantum Filter at every 5 weeks against VAPolyWest's every 10 months. GSDSP Quantum Filter also leads on review sentiment (100% vs 75%) and iOS requirement (12.0 vs 16.6). On price, rating, ratings volume and ads there is nothing between them.

GSDSP Quantum Filter costs $14.99 and VAPolyWest $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 — 5.0 for GSDSP Quantum Filter against 5.0 for VAPolyWest. Both are backed by a comparable volume of ratings — 3 and 5 respectively. Written reviews are what separate them: 100% of GSDSP Quantum Filter's written reviews are positive against 75% of VAPolyWest's.

GSDSP Quantum Filter ships an update every 5 weeks, VAPolyWest every 10 months. The most recent releases landed on September 22, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | GSDSP Quantum Filter | VAPolyWest |
| --- | --- | --- |
| Price | $14.99 | $14.99 |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/gsdsp-quantum-filter/id6498711920/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/vapolywest/id6587550154/reviews) |
| Number of ratings | 3 | **5** |
| Positive reviews | **100.0% of reviews** | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 10 months |
| Monetization | Paid | Paid |
| Size | 77 MB | 15 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Gustav Scholda](https://appshunter.io/developer/1642323227) | [Ryo Togawa](https://appshunter.io/developer/1474193056) |

## 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


### VAPolyWest

[App page](https://appshunter.io/ios/app/vapolywest/id6587550154)

This app is a polyphonic synthesizer inspired by 1960s California west coast synthesis. It features wave folding, lowpass gates, and step sequencers for generative music creation. It functions as a standalone app or an AudioUnit Extension across iPhone, iPad, and Mac.

**Highlights:** Virtual analog west coast style polyphonic synthesizer, Wave folder and lowpass gate, Step sequencer and envelope generators, Up to 8 voice polyphony, Audio Unit Extension (AUv3) support, MIDI 2.0 support, Audio export options

**Features:** 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 VAPolyWest free?

VAPolyWest costs $14.99, with no in-app purchases.

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

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

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

Neither GSDSP Quantum Filter nor VAPolyWest shows ads.

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

GSDSP Quantum Filter ships an update every 5 weeks, and VAPolyWest every 10 months. Most recently, GSDSP Quantum Filter was updated on September 22, 2026 and VAPolyWest on October 7, 2026.

---

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