# Sub System vs Geometry Calculator for School

The clearest difference is price: Geometry Calculator for School at $8.99 against Sub System's $30.00. Sub System's advantage is update cadence (every 10 days vs every 4 months) and iOS requirement (13.0 vs 17.0). On review sentiment, ads, in-app purchases and monetization model there is nothing between them.

Sub System costs $30.00 and Geometry Calculator for School $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Sub System ships an update every 10 days, Geometry Calculator for School every 4 months. The most recent releases landed on October 7, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Sub System | Geometry Calculator for School |
| --- | --- | --- |
| Price | $30.00 | **$8.99** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 4 months |
| Monetization | Paid | Paid |
| Size | 48 MB | 122 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [sebastian rivas](https://appshunter.io/developer/506708461) | [Rudolf Halmi](https://appshunter.io/developer/484210280) |

## 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


### Geometry Calculator for School

[App page](https://appshunter.io/ios/app/geometry-calculator-for-school/id6742743672)

This app provides step-by-step solutions and real-time shape previews for geometry problems, including volume, surface area, and perimeter calculations for over 110 shapes. It also features a weight calculator with customizable materials and works offline without ads.

**Highlights:** Step-by-step geometry solutions, Real-time shape previews, Calculations for over 110 geometric shapes, Weight calculator with custom materials, Offline functionality, No advertisements

**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 Geometry Calculator for School free?

Geometry Calculator for School costs $8.99, with no in-app purchases.

### Do Sub System or Geometry Calculator for School have ads?

Neither Sub System nor Geometry Calculator for School shows ads.

### Which is updated more often, Sub System or Geometry Calculator for School?

Sub System ships an update every 10 days, and Geometry Calculator for School every 4 months. Most recently, Sub System was updated on October 7, 2026 and Geometry Calculator for School on October 16, 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.*