# Handwriting Mental Math vs Synthesis24

The clearest difference is ads: Synthesis24 at none against Handwriting Mental Math's shown. Handwriting Mental Math's advantage is update cadence (fortnightly vs every 3 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Handwriting Mental Math ships an update fortnightly, Synthesis24 every 3 months. The most recent releases landed on October 21, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Handwriting Mental Math | Synthesis24 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 3 months |
| Size | 29 MB | 49 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [娟 秦](https://appshunter.io/developer/1493246128) | [杰超 杨](https://appshunter.io/developer/1364053114) |

## What reviewers say

### Handwriting Mental Math

[App page](https://appshunter.io/ios/app/handwriting-mental-math/id1505292791)

**Features:** macOS Compatibility

**In-app purchases:** none


### Synthesis24

[App page](https://appshunter.io/ios/app/synthesis24/id1606353407)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Handwriting Mental Math free?

Handwriting Mental Math is free to download, with no in-app purchases.

### Is Synthesis24 free?

Synthesis24 is free to download, with no in-app purchases.

### Do Handwriting Mental Math or Synthesis24 have ads?

Handwriting Mental Math shows ads; Synthesis24 does not.

### Which is updated more often, Handwriting Mental Math or Synthesis24?

Handwriting Mental Math ships an update fortnightly, and Synthesis24 every 3 months. Most recently, Handwriting Mental Math was updated on October 21, 2026 and Synthesis24 on October 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.*