# VSEPR Chemistry Invaders vs Periodic

The clearest difference is in-app purchases: Periodic at none against VSEPR Chemistry Invaders's 1. VSEPR Chemistry Invaders's advantage is ads (none vs shown) and update cadence (every 3 days vs every 5 weeks). On price and device support there is nothing between them.

Both are free to download. VSEPR Chemistry Invaders sells 1 one-off in-app purchase. Periodic asks for nothing beyond the download.

VSEPR Chemistry Invaders ships an update every 3 days, Periodic every 5 weeks. The most recent releases landed on October 5, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | VSEPR Chemistry Invaders | Periodic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/vsepr-chemistry-invaders/id1455047962/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 5 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 69 MB | 35 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Power Ten Development LLC](https://appshunter.io/developer/1413480504) | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) |

## What reviewers say

### VSEPR Chemistry Invaders

[App page](https://appshunter.io/ios/app/vsepr-chemistry-invaders/id1455047962)

An arcade-style shooter game designed to help students learn molecular geometries. Players shoot correct geometry models within a time limit to score points and master VSEPR configurations.

**Highlights:** Arcade-style shooter gameplay, Learn VSEPR configurations, Identify Linear, Trigonal Planar, Tetrahedral geometries, Timed scoring system, Interactive learning experience, Extended game length via in-app purchase

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add More Game Time | $0.99 | one-time |


### Periodic

[App page](https://appshunter.io/ios/app/periodic-table-elements/id1628647298)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is VSEPR Chemistry Invaders free?

VSEPR Chemistry Invaders is free to download, with in-app purchases available.

### Is Periodic free?

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

### Do VSEPR Chemistry Invaders or Periodic have ads?

Periodic shows ads; VSEPR Chemistry Invaders does not.

### Which is updated more often, VSEPR Chemistry Invaders or Periodic?

VSEPR Chemistry Invaders ships an update every 3 days, and Periodic every 5 weeks. Most recently, VSEPR Chemistry Invaders was updated on October 5, 2026 and Periodic on October 12, 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.*