# Column Subtraction vs Mnemonics Maker

The clearest difference is price: Mnemonics Maker at Free against Column Subtraction's $3.99. Mnemonics Maker also leads on update cadence (every 2 months vs every 8 months) and iOS requirement (13.0 vs 17.6). Column Subtraction's advantage is rating (4.3 vs 2.0) and in-app purchases (none vs 1). On ads and device support there is nothing between them.

Mnemonics Maker is free to download; Column Subtraction costs $3.99 up front. Mnemonics Maker sells 1 one-off in-app purchase. Column Subtraction asks for nothing beyond the download.

Column Subtraction holds the better App Store score, 4.3 against 2.0. That said, the two scores are not equally well evidenced: Column Subtraction has 6 ratings behind it against 1, so its average is the more settled of the two.

Column Subtraction ships an update every 8 months, Mnemonics Maker every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Column Subtraction | Mnemonics Maker |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/column-subtraction/id341040894/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/mnemonics-maker/id6470495962/reviews) |
| Number of ratings | **6** | 1 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 19 MB | 53 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Esa Helttula](https://appshunter.io/developer/339440196) | [Keith Harryman](https://appshunter.io/developer/1693739510) |

## What reviewers say

### Column Subtraction

[App page](https://appshunter.io/ios/app/column-subtraction/id341040894)

This educational app teaches and reinforces the column subtraction method. It offers an interactive interface with customizable settings for solving random or custom problems. The app includes a puzzle feature that unlocks as users solve math problems.

**Highlights:** Column subtraction method teaching, Interactive and customizable interface, Random and custom problem solving, Adjustable number of digits, Step-by-step renaming animation, Picture puzzle reward system

**Features:** macOS Compatibility

**In-app purchases:** none


### Mnemonics Maker

[App page](https://appshunter.io/ios/app/mnemonics-maker/id6470495962)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads on Mnemonics Maker | $0.99 | one-time |


## Frequently asked questions

### Is Column Subtraction free?

Column Subtraction costs $3.99, with no in-app purchases.

### Is Mnemonics Maker free?

Mnemonics Maker is free to download, with in-app purchases available.

### Which has better reviews, Column Subtraction or Mnemonics Maker?

Column Subtraction is rated higher. Column Subtraction averages 4.3 out of 5 from 6 ratings, while Mnemonics Maker averages 2.0 from 1 ratings.

### Do Column Subtraction or Mnemonics Maker have ads?

Neither Column Subtraction nor Mnemonics Maker shows ads.

### Which is updated more often, Column Subtraction or Mnemonics Maker?

Column Subtraction ships an update every 8 months, and Mnemonics Maker every 2 months. Most recently, Column Subtraction was updated on November 1, 2026 and Mnemonics Maker on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*