# Thoth vs Structura

The clearest difference is in-app purchases: Thoth at none against Structura's 1. Thoth also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Structura sells 1 one-off in-app purchase. Thoth asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on November 5, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Thoth | Structura |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | Every 4 days |
| Monetization | — | Freemium |
| Size | 71 MB | 100 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [THOTH Inc.](https://appshunter.io/developer/6783651004) | [SNAPLACE](https://appshunter.io/developer/6790258232) |

## What reviewers say

### Thoth

[App page](https://appshunter.io/ios/app/thoth/id6783651002)

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

**In-app purchases:** none


### Structura

[App page](https://appshunter.io/ios/app/structura-element-synthesis/id6795030898)

Learn chemical reactions by playing a falling-block puzzle game. Combine elements and ions to build compounds, with over 350 reactions covered. Practice recall with quizzes and tests, and experiment freely with all elements.

**Highlights:** Falling-block puzzle gameplay, Element and ion combination, 356 chemical reactions covered, 46 learning stages, In-game quizzes and tests, Free experiment mode, Visual representation of compounds

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Units | $2.99 | one-time |


## Frequently asked questions

### Is Thoth free?

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

### Is Structura free?

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

### Do Thoth or Structura have ads?

Neither Thoth nor Structura shows ads.

### Which is updated more often, Thoth or Structura?

Thoth ships an update every 4 days, and Structura every 4 days. Most recently, Thoth was updated on November 5, 2026 and Structura on November 8, 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.*