Sub System vs Geometry Calculator for School
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sub System
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.
- Virtual speaker placement
- Sound pressure level visualization
- Frequency response graphs
- Virtual microphone simulation
- Touch-based manipulation
- Acoustical summation understanding
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An app for audio engineers and sound designers. It will let the user place virtual speakers around and see the sound pressure levels that they produce, including the interactions between sources. Colorful graphs for SPL. Frequency response based on virtual microphones. Speakers and Mics are moved around using touch functions. Zoom in, out. All graphics are touchable. Best use is to understand how acoustical summation is produced.
Geometry Calculator for School
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.
- Step-by-step geometry solutions
- Real-time shape previews
- Calculations for over 110 geometric shapes
- Weight calculator with custom materials
- Offline functionality
- No advertisements
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Geometry Calculator is pure non-AI-powered geometry calculator designed mainly for schools with blocked access to in-app subscriptions. Ideal for volume purchase program. App helps users solve volume, surface area, and perimeter problems with step-by-step solutions and real-time shape previews. Users gain access to calculations, theorems, and formulas for over 110 geometric shapes, including triangles, polygons, prisms, and spheres. No ADs and calculations are done in offline. The app also includes a weight calculator with built-in materials. You can also add your own materials.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Sub System | Geometry Calculator for School |
|---|---|---|
| Price | $30.00 | $8.99 — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Update frequency | Every 10 days — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 48 MB | 122 MB |
| Age rating | 4+ | 4+ |
| Developer | sebastian rivas | Rudolf Halmi |
Customer experience
Sub System
Geometry Calculator for School
In-app purchases
Sub System
No in-app purchases
Geometry Calculator for School
No in-app purchases
Questions
Is Sub System free?
Is Geometry Calculator for School free?
Do Sub System or Geometry Calculator for School have ads?
Which is updated more often, Sub System or Geometry Calculator for School?
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