# Math Gremlin vs Subtractor

The clearest difference is in-app purchases: Subtractor at none against Math Gremlin's 3. Subtractor also leads on ads (none vs shown) and update cadence (every 8 days vs every 2 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Math Gremlin sells 3 one-off in-app purchases. Subtractor asks for nothing beyond the download.

Math Gremlin ships an update every 2 months, Subtractor every 8 days. Both last shipped on October 14, 2026.

## The numbers

| Metric | Math Gremlin | Subtractor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (4 ratings)](https://appshunter.io/ios/app/math-gremlin-math-video-game/id6445924683/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 8 days** |
| Monetization | Free with in-app purchases | — |
| Size | 90 MB | 0 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Blue Water Apps, LLC](https://appshunter.io/developer/1541160065) | [David Kelen](https://appshunter.io/developer/1796712157) |

## What reviewers say

### Math Gremlin

[App page](https://appshunter.io/ios/app/math-gremlin-math-video-game/id6445924683)

This game makes learning basic math fun by having players guide a character through challenges to find numbers that add up to a target sum before time expires. Levels increase in difficulty, offering replayability with unique problems each time. In-game currency can be earned or purchased to enhance gameplay.

**Highlights:** Number addition puzzles, Time-based challenges, Progressive difficulty levels, Replayable unique problems, In-game currency for boosts, Character customization

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 25,000 Coins | $0.99 | one-time |
| 100,000 Coins | $2.99 | one-time |
| 500,000 Coins | $9.99 | one-time |


### Subtractor

[App page](https://appshunter.io/ios/app/subtractor-by-mather/id6742201502)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Math Gremlin free?

Math Gremlin is free to download, with in-app purchases available.

### Is Subtractor free?

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

### Do Math Gremlin or Subtractor have ads?

Math Gremlin shows ads; Subtractor does not.

### Which is updated more often, Math Gremlin or Subtractor?

Math Gremlin ships an update every 2 months, and Subtractor every 8 days. Most recently, Math Gremlin was updated on October 14, 2026 and Subtractor on October 14, 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.*