# Subtraction Math Master vs Numeric Odyssey

The clearest difference is in-app purchases: Numeric Odyssey at none against Subtraction Math Master's 1. Numeric Odyssey also leads on update cadence (every 2 weeks vs every 18 months). Subtraction Math Master's advantage is ads (none vs shown) and iOS requirement (8.0 vs 15.1). On price and device support there is nothing between them.

Both are free to download. Subtraction Math Master sells 1 one-off in-app purchase. Numeric Odyssey asks for nothing beyond the download.

Subtraction Math Master ships an update every 18 months, Numeric Odyssey every 2 weeks. The most recent releases landed on September 18, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Subtraction Math Master | Numeric Odyssey |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 18 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 27 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Peter Li](https://appshunter.io/developer/424298074) | [Truong Van Truong](https://appshunter.io/developer/1601624508) |

## What reviewers say

### Subtraction Math Master

[App page](https://appshunter.io/ios/app/subtraction-math-master/id672670414)

Enhance your mental math skills with this game focused on 2-digit subtraction. It offers modes for quick challenges and unlimited practice, helping you reduce calculator reliance and boost cognitive function.

**Highlights:** Improve 2-digit mental subtraction, Timed challenges and unlimited practice modes, Track scores and statistics, Game Center Leaderboards & Achievements, Share scores with friends and family, Stylish and intuitive interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WORK MODE | $0.99 | one-time |


### Numeric Odyssey

[App page](https://appshunter.io/ios/app/numeric-odyssey/id6472152796)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Subtraction Math Master free?

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

### Is Numeric Odyssey free?

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

### Do Subtraction Math Master or Numeric Odyssey have ads?

Numeric Odyssey shows ads; Subtraction Math Master does not.

### Which is updated more often, Subtraction Math Master or Numeric Odyssey?

Subtraction Math Master ships an update every 18 months, and Numeric Odyssey every 2 weeks. Most recently, Subtraction Math Master was updated on September 18, 2026 and Numeric Odyssey on September 17, 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.*