# Viscosity Conversion vs PsychroFlow Pro

The clearest difference is price: PsychroFlow Pro at $1.99 against Viscosity Conversion's $2.99. Viscosity Conversion's advantage is iOS requirement (13 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

Viscosity Conversion costs $2.99 and PsychroFlow Pro $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Viscosity Conversion | PsychroFlow Pro |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 30 months | — |
| Size | 1 MB | 30 MB |
| Requires iOS | **13** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [David Amison](https://appshunter.io/developer/808351168) |

## What reviewers say

### Viscosity Conversion

[App page](https://appshunter.io/ios/app/viscosity-conversion/id630288155)

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

**In-app purchases:** none


### PsychroFlow Pro

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

**In-app purchases:** none


## Frequently asked questions

### Is Viscosity Conversion free?

Viscosity Conversion costs $2.99, with no in-app purchases.

### Is PsychroFlow Pro free?

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

### Do Viscosity Conversion or PsychroFlow Pro have ads?

Neither Viscosity Conversion 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.*