# Sub System vs SciCalc Pro

The clearest difference is price: SciCalc Pro at Free against Sub System's $30.00. Sub System's advantage is update cadence (every 10 days vs every 13 months) and iOS requirement (13.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

SciCalc Pro 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, SciCalc Pro every 13 months. The most recent releases landed on October 7, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Sub System | SciCalc Pro |
| --- | --- | --- |
| Price | $30.00 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 13 months |
| Monetization | Paid | — |
| Size | 48 MB | 12 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [sebastian rivas](https://appshunter.io/developer/506708461) | [Nehemiah Pettway](https://appshunter.io/developer/1828681134) |

## 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


### SciCalc Pro

[App page](https://appshunter.io/ios/app/scicalc-pro/id6751385866)

**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 SciCalc Pro free?

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

### Do Sub System or SciCalc Pro have ads?

Neither Sub System nor SciCalc Pro shows ads.

### Which is updated more often, Sub System or SciCalc Pro?

Sub System ships an update every 10 days, and SciCalc Pro every 13 months. Most recently, Sub System was updated on October 7, 2026 and SciCalc Pro on September 30, 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.*