# PrefixCalc vs Gratuity Lab

The clearest difference is ads: PrefixCalc at none against Gratuity Lab's shown. PrefixCalc also leads on iOS requirement (12.0 vs 17.0). On price, in-app purchases and device support 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 | Gratuity Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | — | Every 5 days |
| Size | 28 MB | 10 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YONAGARE LAB](https://appshunter.io/developer/1810986554) | [Wenbin lei](https://appshunter.io/developer/1787331500) |

## What reviewers say

### PrefixCalc

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Gratuity Lab

[App page](https://appshunter.io/ios/app/gratuity-lab-tip-calculator/id6797330328)

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

**In-app purchases:** none


## Frequently asked questions

### Is PrefixCalc free?

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

### Is Gratuity Lab free?

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

### Do PrefixCalc or Gratuity Lab have ads?

Gratuity Lab shows ads; PrefixCalc does not.

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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.*