# Periodic Table vs Structural Formulas Study

The clearest difference is update cadence: Periodic Table at every 3 days against Structural Formulas Study's every 5 weeks. On price, ads, 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.

Periodic Table ships an update every 3 days, Structural Formulas Study every 5 weeks. The most recent releases landed on September 11, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Periodic Table | Structural Formulas Study |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 5 weeks |
| Size | 23 MB | 5 MB |
| Requires iOS | **18.0** | 18.4 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [HAYDEN D'ERRICO](https://appshunter.io/developer/1812333086) | [Jun Yamabe](https://appshunter.io/developer/1732682049) |

## What reviewers say

### Periodic Table

[App page](https://appshunter.io/ios/app/periodic-table-periodica/id6745459785)

**In-app purchases:** none


### Structural Formulas Study

[App page](https://appshunter.io/ios/app/structural-formulas-study/id6752260162)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Periodic Table free?

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

### Is Structural Formulas Study free?

Structural Formulas Study is free to download, with no in-app purchases.

### Do Periodic Table or Structural Formulas Study have ads?

Neither Periodic Table nor Structural Formulas Study shows ads.

### Which is updated more often, Periodic Table or Structural Formulas Study?

Periodic Table ships an update every 3 days, and Structural Formulas Study every 5 weeks. Most recently, Periodic Table was updated on September 11, 2026 and Structural Formulas Study on September 20, 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.*