# AOSB vs Mental Math

The clearest difference is in-app purchases: AOSB at none against Mental Math's 2. AOSB also leads on iOS requirement (15.6 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Mental Math sells 2 one-off in-app purchases. AOSB asks for nothing beyond the download.

AOSB ships an update every 2 weeks, Mental Math fortnightly. The most recent releases landed on October 14, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | AOSB | Mental Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/mental-math-kalc/id6764098294/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 12 MB | 17 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [George Lee](https://appshunter.io/developer/1295254226) | [LMT Digital Creations](https://appshunter.io/developer/640455461) |

## What reviewers say

### AOSB

[App page](https://appshunter.io/ios/app/aosb/id6762511460)

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

**In-app purchases:** none


### Mental Math

[App page](https://appshunter.io/ios/app/mental-math-kalc/id6764098294)

Sharpen your mental math skills with daily practice. This app uses spaced repetition to help you master concepts like fractions, percentages, and algebra. It offers two modes for flexible learning and provides real-life examples of how math is used every day.

**Highlights:** Spaced repetition system (SRS), Covers multiplication, division, fractions, percentages, algebra, Zen and Chrono practice modes, Visible progress tracking, Real-life math examples, Home screen widgets, Customizable reminders

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plan Annuel | $17.99 | one-time |
| Accès à vie | $29.99 | one-time |


## Frequently asked questions

### Is AOSB free?

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

### Is Mental Math free?

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

### Do AOSB or Mental Math have ads?

Neither AOSB nor Mental Math shows ads.

### Which is updated more often, AOSB or Mental Math?

AOSB ships an update every 2 weeks, and Mental Math fortnightly. Most recently, AOSB was updated on October 14, 2026 and Mental Math on October 31, 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.*