# Calc pH vs PsychroFlow Pro

The clearest difference is price: Calc pH at Free against PsychroFlow Pro's $1.99. Calc pH also leads on iOS requirement (9.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

Calc pH is free to download; PsychroFlow Pro costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Calc pH | PsychroFlow Pro |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 59 months | — |
| Size | 0 MB | 30 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ZOFTERM](https://appshunter.io/developer/557950548) | [David Amison](https://appshunter.io/developer/808351168) |

## What reviewers say

### Calc pH

[App page](https://appshunter.io/ios/app/calc-ph/id566354963)

**Features:** macOS Compatibility

**In-app purchases:** none


### PsychroFlow Pro

[App page](https://appshunter.io/ios/app/psychroflow-pro/id6757249718)

**In-app purchases:** none


## Frequently asked questions

### Is Calc pH free?

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

### Is PsychroFlow Pro free?

PsychroFlow Pro costs $1.99, with no in-app purchases.

### Do Calc pH or PsychroFlow Pro have ads?

Neither Calc pH nor PsychroFlow Pro shows ads.

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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.*