# Mental Math vs Sum Serenity

The clearest difference is update cadence: Mental Math at every 2 weeks against Sum Serenity's every 3 months. Sum Serenity's advantage is iOS requirement (12.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Mental Math sells 1 one-off in-app purchase and Sum Serenity sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Mental Math ships an update every 2 weeks, Sum Serenity every 3 months. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Mental Math | Sum Serenity |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/mental-math-fast-calculation/id1515025315/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | — |
| Size | 59 MB | 33 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Oliver Glaettli](https://appshunter.io/developer/1515025314) | [Blossom Labs](https://appshunter.io/developer/1723890403) |

## What reviewers say

### Mental Math

[App page](https://appshunter.io/ios/app/mental-math-fast-calculation/id1515025315)

Enhance your mental math abilities with this interactive app. It offers engaging gameplay and exercises, teaching calculation secrets and tricks to solve problems quickly. Track your progress and compete globally.

**Highlights:** Basic operations (+, -, x, /), Multiplication tables (1-20), Power calculation (1-100), Percentage challenges, Fast calculation tricks, Adjustable difficulty levels, Progress tracking

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Purchase Mental Calculation | $6.99 | one-time |


### Sum Serenity

[App page](https://appshunter.io/ios/app/sum-serenity/id6475314608)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Serenity Seeker | $1.99 | one-time |


## Frequently asked questions

### Is Mental Math free?

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

### Is Sum Serenity free?

Sum Serenity is free to download, with in-app purchases available.

### Do Mental Math or Sum Serenity have ads?

Neither Mental Math nor Sum Serenity shows ads.

### Which is updated more often, Mental Math or Sum Serenity?

Mental Math ships an update every 2 weeks, and Sum Serenity every 3 months. Most recently, Mental Math was updated on October 16, 2026 and Sum Serenity on October 7, 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.*