# Synthesis24 vs Spelling Hero

The clearest difference is in-app purchases: Synthesis24 at none against Spelling Hero's 1. Synthesis24 also leads on iOS requirement (15.0 vs 17.6). Spelling Hero's advantage is update cadence (weekly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Spelling Hero sells 1 one-off in-app purchase. Synthesis24 asks for nothing beyond the download.

Synthesis24 ships an update every 3 months, Spelling Hero weekly. Both last shipped on October 25, 2026.

## The numbers

| Metric | Synthesis24 | Spelling Hero |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Size | 49 MB | 4 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [杰超 杨](https://appshunter.io/developer/1364053114) | [Ryan Lodge](https://appshunter.io/developer/1866044484) |

## What reviewers say

### Synthesis24

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Spelling Hero

[App page](https://appshunter.io/ios/app/spelling-hero/id6776420111)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Full Access | $2.99 | one-time |


## Frequently asked questions

### Is Synthesis24 free?

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

### Is Spelling Hero free?

Spelling Hero is free to download, with in-app purchases available.

### Do Synthesis24 or Spelling Hero have ads?

Neither Synthesis24 nor Spelling Hero shows ads.

### Which is updated more often, Synthesis24 or Spelling Hero?

Synthesis24 ships an update every 3 months, and Spelling Hero weekly. Most recently, Synthesis24 was updated on October 25, 2026 and Spelling Hero on October 25, 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.*