# Simple Mental Math Practice vs School Letters

The clearest difference is price: Simple Mental Math Practice at Free against School Letters's $8.99. School Letters's advantage is in-app purchases (none vs 1) and ads (none vs shown). On update cadence, device support and iOS requirement there is nothing between them.

Simple Mental Math Practice is free to download; School Letters costs $8.99 up front. Simple Mental Math Practice sells 1 one-off in-app purchase. School Letters asks for nothing beyond the download.

Simple Mental Math Practice ships an update every 3 days, School Letters every 6 days. The most recent releases landed on September 10, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Simple Mental Math Practice | School Letters |
| --- | --- | --- |
| Price | **Free** | $8.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 6 days |
| Monetization | — | Paid |
| Size | 36 MB | 65 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ENDEVLAB](https://appshunter.io/developer/1803275438) | [Martin Seidel](https://appshunter.io/developer/1580372911) |

## What reviewers say

### Simple Mental Math Practice

[App page](https://appshunter.io/ios/app/simple-mental-math-practice/id6755456204)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Premium | $6.99 | one-time |


### School Letters

[App page](https://appshunter.io/ios/app/school-letters/id6756991830)

This app offers an engaging way for children to learn writing letters and numbers. It features interactive tracing, real-time feedback on accuracy, and progress tracking. Kids can collect energy, unlock achievements, and export their work as PDFs.

**Highlights:** Interactive letter and number tracing, Real-time accuracy evaluation, Drawing history and playback, PDF export of written letters, Achievement system for motivation, Multiple font choices, Progress tracking with scores and stars

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Simple Mental Math Practice free?

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

### Is School Letters free?

School Letters costs $8.99, with no in-app purchases.

### Do Simple Mental Math Practice or School Letters have ads?

Simple Mental Math Practice shows ads; School Letters does not.

### Which is updated more often, Simple Mental Math Practice or School Letters?

Simple Mental Math Practice ships an update every 3 days, and School Letters every 6 days. Most recently, Simple Mental Math Practice was updated on September 10, 2026 and School Letters on September 9, 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.*