# Chemical Equations Trainer vs Periodic Table

The clearest difference is in-app purchases: Periodic Table at none against Chemical Equations Trainer's 1. Periodic Table also leads on update cadence (weekly vs every 3 weeks) and iOS requirement (15.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Chemical Equations Trainer sells 1 one-off in-app purchase. Periodic Table asks for nothing beyond the download.

Chemical Equations Trainer ships an update every 3 weeks, Periodic Table weekly. The most recent releases landed on October 18, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Chemical Equations Trainer | Periodic Table |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 12 MB | 42 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Mehanic](https://appshunter.io/developer/1888807545) | [Oleg Korunov](https://appshunter.io/developer/6811071409) |

## What reviewers say

### Chemical Equations Trainer

[App page](https://appshunter.io/ios/app/chemical-equations-trainer/id6797987873)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $3.99 | one-time |


### Periodic Table

[App page](https://appshunter.io/ios/app/periodic-table-118-elements/id6811071407)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chemical Equations Trainer free?

Chemical Equations Trainer is free to download, with in-app purchases available.

### Is Periodic Table free?

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

### Do Chemical Equations Trainer or Periodic Table have ads?

Neither Chemical Equations Trainer nor Periodic Table shows ads.

### Which is updated more often, Chemical Equations Trainer or Periodic Table?

Chemical Equations Trainer ships an update every 3 weeks, and Periodic Table weekly. Most recently, Chemical Equations Trainer was updated on October 18, 2026 and Periodic Table on October 21, 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.*