# Subtraction Math vs Interactive Solar System

The clearest difference is update cadence: Interactive Solar System at fortnightly against Subtraction Math's every 4 months. Interactive Solar System also leads on iOS requirement (12.0 vs 15.0). Subtraction Math's advantage is device support (5 vs 2). On price, ads and in-app purchases there is nothing between them.

Subtraction Math costs $1.99 and Interactive Solar System $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Subtraction Math ships an update every 4 months, Interactive Solar System fortnightly. The most recent releases landed on September 22, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Subtraction Math | Interactive Solar System |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | **[3.9 (7 ratings)](https://appshunter.io/ios/app/subtraction-math-ibbleobble/id978343612/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 17 MB | 52 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Mac, Apple TV** | iPad, Apple TV |
| Age rating | 4+ | 4+ |
| Developer | [KidDotCo](https://appshunter.io/developer/819246599) | [Ventura Educational Systems](https://appshunter.io/developer/371324172) |

## What reviewers say

### Subtraction Math

[App page](https://appshunter.io/ios/app/subtraction-math-ibbleobble/id978343612)

This educational game helps children aged 5-8 practice subtraction skills through engaging drills and multiple-choice questions. It offers a flexible learning pace with an optional timer and vibrant visuals to make arithmetic fun.

**Highlights:** Subtraction drills, Multiple choice format, Adjustable difficulty, Optional timer, Colorful graphics and sounds, Universal purchase

**Features:** iMessage stickers

**In-app purchases:** none


### Interactive Solar System

[App page](https://appshunter.io/ios/app/interactive-solar-system/id1240878228)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Subtraction Math free?

Subtraction Math costs $1.99, with no in-app purchases.

### Is Interactive Solar System free?

Interactive Solar System costs $1.99, with no in-app purchases.

### Do Subtraction Math or Interactive Solar System have ads?

Neither Subtraction Math nor Interactive Solar System shows ads.

### Which is updated more often, Subtraction Math or Interactive Solar System?

Subtraction Math ships an update every 4 months, and Interactive Solar System fortnightly. Most recently, Subtraction Math was updated on September 22, 2026 and Interactive Solar System on September 18, 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.*