# Sub System vs GCP

The clearest difference is price: GCP at Free against Sub System's $30.00. Sub System's advantage is update cadence (every 10 days vs every 3 months) and iOS requirement (13.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

GCP is free to download; Sub System costs $30.00 up front. Neither carries in-app purchases, so what you see is what you pay.

Sub System ships an update every 10 days, GCP every 3 months. The most recent releases landed on October 7, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Sub System | GCP |
| --- | --- | --- |
| Price | $30.00 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 3 months |
| Monetization | Paid | — |
| Size | 48 MB | 30 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [sebastian rivas](https://appshunter.io/developer/506708461) | [Davy Raitt](https://appshunter.io/developer/1795318281) |

## What reviewers say

### Sub System

[App page](https://appshunter.io/ios/app/sub-system/id1533524994)

This app allows audio engineers and sound designers to visualize sound pressure levels and their interactions. Users can place virtual speakers and microphones, manipulate them with touch gestures, and observe colorful graphs of SPL and frequency response to understand acoustical summation.

**Highlights:** Virtual speaker placement, Sound pressure level visualization, Frequency response graphs, Virtual microphone simulation, Touch-based manipulation, Acoustical summation understanding

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

**In-app purchases:** none


### GCP

[App page](https://appshunter.io/ios/app/gcp-pse-secops-engineer-prep/id6757182841)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sub System free?

Sub System costs $30.00, with no in-app purchases.

### Is GCP free?

GCP is free to download, with no in-app purchases.

### Do Sub System or GCP have ads?

Neither Sub System nor GCP shows ads.

### Which is updated more often, Sub System or GCP?

Sub System ships an update every 10 days, and GCP every 3 months. Most recently, Sub System was updated on October 7, 2026 and GCP on September 28, 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.*