# PrefixCalc vs VisualTimer byNSDev

The clearest difference is device support: PrefixCalc at 3 against VisualTimer byNSDev's —. PrefixCalc also leads on iOS requirement (12.0 vs 17). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | PrefixCalc | VisualTimer byNSDev |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Size | 28 MB | 2 MB |
| Requires iOS | **12.0** | 17 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [YONAGARE LAB](https://appshunter.io/developer/1810986554) | [NIHON SYSTEM DEVELOPER CORPORATION](https://appshunter.io/developer/1198103734) |

## What reviewers say

### PrefixCalc

[App page](https://appshunter.io/ios/app/prefixcalc/id6748650037)

**Features:** macOS Compatibility

**In-app purchases:** none


### VisualTimer byNSDev

[App page](https://appshunter.io/ios/app/visualtimer-bynsdev/id6752543102)

**In-app purchases:** none


## Frequently asked questions

### Is PrefixCalc free?

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

### Is VisualTimer byNSDev free?

VisualTimer byNSDev is free to download, with no in-app purchases.

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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.*