# Mental Math vs Stacked AI

The clearest difference is in-app purchases: Stacked AI at none against Mental Math's 1. Stacked AI also leads on ads (none vs shown) and update cadence (daily vs every 6 weeks). Mental Math's advantage is iOS requirement (13.0 vs 15.1). On price and device support there is nothing between them.

Both are free to download. Mental Math sells 1 one-off in-app purchase. Stacked AI asks for nothing beyond the download.

Mental Math ships an update every 6 weeks, Stacked AI daily. The most recent releases landed on November 3, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Mental Math | Stacked AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/mental-math-train-your-brain/id1499208866/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Daily** |
| Monetization | Free | — |
| Size | 51 MB | 35 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Amna Mahmood](https://appshunter.io/developer/1483939415) | [Daniel Cuevas](https://appshunter.io/developer/1857075196) |

## What reviewers say

### Mental Math

[App page](https://appshunter.io/ios/app/mental-math-train-your-brain/id1499208866)

This free application helps you improve your mental calculation skills. It assesses your strengths and weaknesses to create a personalized practice plan, offering tips and exercises to master mathematical concepts quickly and efficiently.

**Highlights:** Personalized learning plans, Identifies strengths and weaknesses, Teaches mental math tricks, Practice exercises, Skill assessment

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### Stacked AI

[App page](https://appshunter.io/ios/app/stacked-ai/id6756550526)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mental Math free?

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

### Is Stacked AI free?

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

### Do Mental Math or Stacked AI have ads?

Mental Math shows ads; Stacked AI does not.

### Which is updated more often, Mental Math or Stacked AI?

Mental Math ships an update every 6 weeks, and Stacked AI daily. Most recently, Mental Math was updated on November 3, 2026 and Stacked AI on October 28, 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.*