Third grade Math vs Sub System
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Third grade Math
Read full descriptionHide full description
Elevate your subtraction skills with Third Grade Math Subtraction—an engaging app that blends natural handwriting input with adaptive mini games. Choose between two modes: use Math Trainer as a whiteboard to write answers at your own pace, or dive into 5 fun, interactive Math mini games that adjust to your skill level. With Third grade Math - Subtraction you can practice and improve the following math skills: - Subtraction facts - numbers up to 100 - Subtract two two-digit numbers - Subtract two three-digit numbers - Complete the subtraction sentence up to three digits - Subtract numbers with four or five digits - Balance subtraction equations up to two digits - Balance subtraction equations up to three digits Master essential subtraction concepts while enjoying an adaptive, dynamic learning experience that keeps you challenged and motivated every step of the way. Download today and transform your math practice into a rewarding adventure!
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
Read full descriptionHide full description
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.
Screenshots
Verdict
The clearest difference is price: Third grade Math at $2.99 against Sub System's $30.00. Sub System's advantage is update cadence (every 10 days vs every 28 months). On ads, in-app purchases, device support and iOS requirement 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
Third grade Math costs $2.99 and Sub System $30.00 up front. Neither carries in-app purchases, so what you see is what you pay.
Third grade Math ships an update every 28 months, Sub System every 10 days. The most recent releases landed on October 10, 2026 and October 7, 2026 respectively.
| Parameter | Third grade Math | Sub System |
|---|---|---|
| Price | $2.99 — better | $30.00 |
| Positive reviews | — | 100.0% of reviews |
| Update frequency | Every 28 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 17 MB | 48 MB |
| Age rating | 4+ | 4+ |
| Developer | Sergey Malugin | sebastian rivas |
In-app purchases
Third grade Math
No in-app purchases
Sub System
No in-app purchases
Questions
Is Third grade Math free?
Is Sub System free?
Do Third grade Math or Sub System have ads?
Which is updated more often, Third grade Math or Sub System?
Other comparisons
