# H4E numbers vs pHCalculation

The clearest difference is in-app purchases: H4E numbers at none against pHCalculation's 5. H4E numbers also leads on iOS requirement (10.0 vs 18.6). pHCalculation's advantage is device support. On price there is nothing between them.

Both are free to download. pHCalculation sells 5 one-off in-app purchases. H4E numbers asks for nothing beyond the download.

## The numbers

| Metric | H4E numbers | pHCalculation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Every 5 days |
| Size | 43 MB | 2 MB |
| Requires iOS | **10.0** | 18.6 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [HSC, Chulalongkorn University](https://appshunter.io/developer/1469356995) | [Jatuphol Jaturapat](https://appshunter.io/developer/1788860463) |

## What reviewers say

### H4E numbers

[App page](https://appshunter.io/ios/app/h4e-numbers/id1475458172)

**In-app purchases:** none


### pHCalculation

[App page](https://appshunter.io/ios/app/phcalculation/id6743737030)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Show solution | $0.99 | one-time |
| Buffer Calculator | $0.99 | one-time |
| Salt pH calculator | $0.99 | one-time |
| Reverse pH calculator | $0.99 | one-time |
| Unlock All Features. | $1.99 | one-time |


## Frequently asked questions

### Is H4E numbers free?

H4E numbers is free to download, with no in-app purchases.

### Is pHCalculation free?

pHCalculation 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.*