# U.S. Army STARS Elements vs Periodic Table Watch

The clearest difference is price: U.S. Army STARS Elements at Free against Periodic Table Watch's $0.99. U.S. Army STARS Elements also leads on iOS requirement (11.0 vs 26.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

U.S. Army STARS Elements is free to download; Periodic Table Watch costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

U.S. Army STARS Elements ships an update every 8 months, Periodic Table Watch every 9 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | U.S. Army STARS Elements | Periodic Table Watch |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.6 (19 ratings)](https://appshunter.io/ios/app/us-army-stars-elements/id1103901837/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 9 months |
| Monetization | Free | — |
| Size | 213 MB | 6 MB |
| Requires iOS | **11.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 9+ | 4+ |
| Developer | [Army Game Studio](https://appshunter.io/developer/540858534) | [Jim Haungs](https://appshunter.io/developer/1498282259) |

## What reviewers say

### U.S. Army STARS Elements

[App page](https://appshunter.io/ios/app/us-army-stars-elements/id1103901837)

Explore the world of chemistry with interactive tools to build atoms, learn chemical bonds, and discover elements. Test your knowledge with engaging challenges designed for students, teachers, and enthusiasts.

**Highlights:** Atom Builder, SmashBond game, Interactive Periodic Table, STARS Challenge quiz, 3D atom construction, Bohr's model visualization

**Features:** macOS Compatibility

**In-app purchases:** none


### Periodic Table Watch

[App page](https://appshunter.io/ios/app/periodic-table-watch/id1551884849)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is U.S. Army STARS Elements free?

U.S. Army STARS Elements is free to download, with no in-app purchases.

### Is Periodic Table Watch free?

Periodic Table Watch costs $0.99, with no in-app purchases.

### Do U.S. Army STARS Elements or Periodic Table Watch have ads?

Neither U.S. Army STARS Elements nor Periodic Table Watch shows ads.

### Which is updated more often, U.S. Army STARS Elements or Periodic Table Watch?

U.S. Army STARS Elements ships an update every 8 months, and Periodic Table Watch every 9 months. Most recently, U.S. Army STARS Elements was updated on October 26, 2026 and Periodic Table Watch on October 27, 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.*