# Twi vs Structura

The clearest difference is in-app purchases: Twi at none against Structura's 1. Twi also leads on iOS requirement (9.2 vs 17.0). Structura's advantage is update cadence (every 4 days vs every 2 weeks). On price, review sentiment, ads and device support there is nothing between them.

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

Twi ships an update every 2 weeks, Structura every 4 days. The most recent releases landed on November 6, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Twi | Structura |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/twi-timer-time-saver/id655444629/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Monetization | **Free** | Freemium |
| Size | 3 MB | 100 MB |
| Requires iOS | **9.2** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Masao Yamashita](https://appshunter.io/developer/651345791) | [SNAPLACE LLC](https://appshunter.io/developer/6790258232) |

## What reviewers say

### Twi

[App page](https://appshunter.io/ios/app/twi-timer-time-saver/id655444629)

This app helps you manage your time spent on social media platforms like Twitter and Facebook. It allows you to set daily limits and timers for browsing sessions, preventing excessive use and promoting a healthier balance between online and offline activities.

**Highlights:** Set daily social media limits, Schedule browsing timers, Supports Twitter and Facebook, Automatic session shutdown, Prevents internet addiction, Promotes healthy digital habits

**Features:** macOS Compatibility

**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 Twi free?

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

### Is Structura free?

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

### Do Twi or Structura have ads?

Neither Twi nor Structura shows ads.

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

Twi ships an update every 2 weeks, and Structura every 4 days. Most recently, Twi was updated on November 6, 2026 and Structura on November 10, 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.*