# pHCalculation vs ChemBioCalc

The clearest difference is ads: pHCalculation at none against ChemBioCalc's shown. ChemBioCalc's advantage is iOS requirement (15.1 vs 18.6). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. pHCalculation sells 5 one-off in-app purchases and ChemBioCalc sells 4 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

pHCalculation ships an update every 5 days, ChemBioCalc every 4 days. The most recent releases landed on October 9, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | pHCalculation | ChemBioCalc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 days | **Every 4 days** |
| Size | 2 MB | 69 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jatuphol Jaturapat](https://appshunter.io/developer/1788860463) | [mit Can ERM](https://appshunter.io/developer/1894513244) |

## What reviewers say

### 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 |


### ChemBioCalc

[App page](https://appshunter.io/ios/app/chembiocalc-lab-assistant/id6762520756)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $1.99 | per 7 days |
| Pro Monthly | $4.99 | per month |
| Pro Yearly | $17.99 | per year |
| Single Result | $0.99 | one-time |


## Frequently asked questions

### Is pHCalculation free?

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

### Is ChemBioCalc free?

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

### Do pHCalculation or ChemBioCalc have ads?

ChemBioCalc shows ads; pHCalculation does not.

### Which is updated more often, pHCalculation or ChemBioCalc?

pHCalculation ships an update every 5 days, and ChemBioCalc every 4 days. Most recently, pHCalculation was updated on October 9, 2026 and ChemBioCalc on October 10, 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.*