# PrefixCalc vs Flex Calculators

The clearest difference is in-app purchases: PrefixCalc at none against Flex Calculators's 1. PrefixCalc also leads on iOS requirement (12.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Flex Calculators sells 1 one-off in-app purchase. PrefixCalc asks for nothing beyond the download.

## The numbers

| Metric | PrefixCalc | Flex Calculators |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 10 days |
| Size | 28 MB | 37 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [YONAGARE LAB](https://appshunter.io/developer/1810986554) | [An Le](https://appshunter.io/developer/1863975090) |

## What reviewers say

### PrefixCalc

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Flex Calculators

[App page](https://appshunter.io/ios/app/flex-calculators/id6761326502)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is PrefixCalc free?

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

### Is Flex Calculators free?

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

### Do PrefixCalc or Flex Calculators have ads?

Neither PrefixCalc nor Flex Calculators 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.*