# Periodic vs CHEM

The clearest difference is ads: CHEM at none against Periodic's shown. Periodic's advantage is iOS requirement (15.1 vs 18.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Periodic | CHEM |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | — |
| Size | 35 MB | 1 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) | [Vincent van Eijsden](https://appshunter.io/developer/1793847278) |

## What reviewers say

### Periodic

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

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

**In-app purchases:** none


### CHEM

[App page](https://appshunter.io/ios/app/chem-periodic-table/id6745701999)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Periodic free?

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

### Is CHEM free?

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

### Do Periodic or CHEM have ads?

Periodic shows ads; CHEM does not.

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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.*