# Knowledgy vs Carbon Compounds Practice

The clearest difference is device support: Knowledgy at 3 against Carbon Compounds Practice's —. Carbon Compounds Practice's advantage is iOS requirement (13.0 vs 15.6). On price and in-app purchases there is nothing between them.

Both are free to download. Knowledgy sells 1 one-off in-app purchase and Carbon Compounds Practice sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Knowledgy | Carbon Compounds Practice |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | — |
| Update frequency | Weekly | — |
| Size | 29 MB | 29 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 12+ |
| Developer | [The Datum Company](https://appshunter.io/developer/1424384309) | [Manish Kumar](https://appshunter.io/developer/1854995154) |

## What reviewers say

### Knowledgy

[App page](https://appshunter.io/ios/app/knowledgy/id1424384310)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $2.99 | one-time |


### Carbon Compounds Practice

[App page](https://appshunter.io/ios/app/carbon-compounds-practice/id6760224779)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.49 | one-time |


## Frequently asked questions

### Is Knowledgy free?

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

### Is Carbon Compounds Practice free?

Carbon Compounds Practice is free to download, with in-app purchases available.

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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.*