# Periodic Table vs marrow

The clearest difference is in-app purchases: marrow at none against Periodic Table's 1. marrow also leads on ads (none vs shown). Periodic Table's advantage is iOS requirement (13.0 vs 16.4). On price, update cadence and device support there is nothing between them.

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

Periodic Table ships an update every 2 days, marrow every 3 days. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Periodic Table | marrow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 3 days |
| Size | 34 MB | 40 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Furkan Calar](https://appshunter.io/developer/1807396889) | [Pratyush Saxena](https://appshunter.io/developer/1896770612) |

## What reviewers say

### Periodic Table

[App page](https://appshunter.io/ios/app/periodic-table-learn-and-play/id6752439893)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### marrow

[App page](https://appshunter.io/ios/app/marrow-scroll-to-learn/id6791669414)

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

**In-app purchases:** none


## Frequently asked questions

### Is Periodic Table free?

Periodic Table is free to download, with in-app purchases available.

### Is marrow free?

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

### Do Periodic Table or marrow have ads?

Periodic Table shows ads; marrow does not.

### Which is updated more often, Periodic Table or marrow?

Periodic Table ships an update every 2 days, and marrow every 3 days. Most recently, Periodic Table was updated on October 30, 2026 and marrow on October 25, 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.*