# Sub System vs ECIH Incident Handler Prep

The clearest difference is price: ECIH Incident Handler Prep at Free against Sub System's $24.99. Sub System's advantage is update cadence (every 3 weeks vs every 3 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

ECIH Incident Handler Prep is free to download; Sub System costs $24.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Sub System ships an update every 3 weeks, ECIH Incident Handler Prep every 3 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Sub System | ECIH Incident Handler Prep |
| --- | --- | --- |
| Price | $24.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Paid | — |
| Size | 89 MB | 27 MB |
| Requires iOS | 15.0 | 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


### ECIH Incident Handler Prep

[App page](https://appshunter.io/ios/app/ecih-incident-handler-prep/id6757863349)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sub System free?

Sub System costs $24.99, with no in-app purchases.

### Is ECIH Incident Handler Prep free?

ECIH Incident Handler Prep is free to download, with no in-app purchases.

### Do Sub System or ECIH Incident Handler Prep have ads?

Neither Sub System nor ECIH Incident Handler Prep shows ads.

### Which is updated more often, Sub System or ECIH Incident Handler Prep?

Sub System ships an update every 3 weeks, and ECIH Incident Handler Prep every 3 months. Most recently, Sub System was updated on November 3, 2026 and ECIH Incident Handler Prep on October 31, 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.*