# kong calculator vs Unit Converter

The clearest difference is in-app purchases: kong calculator at none against Unit Converter's 1. kong calculator also leads on update cadence (every 4 days vs every 2 weeks). Unit Converter's advantage is ads (none vs shown) and iOS requirement (12.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Unit Converter sells 1 one-off in-app purchase. kong calculator asks for nothing beyond the download.

kong calculator ships an update every 4 days, Unit Converter every 2 weeks. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | kong calculator | Unit Converter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Size | 20 MB | 29 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Changyeol Seo](https://appshunter.io/developer/551904752) | [伟鹏 李](https://appshunter.io/developer/1817642925) |

## What reviewers say

### kong calculator

[App page](https://appshunter.io/ios/app/kong-calculator/id1594969449)

**Features:** macOS Compatibility

**In-app purchases:** none


### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-easyunit/id6754090225)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Premium Membership | $0.99 | one-time |


## Frequently asked questions

### Is kong calculator free?

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

### Is Unit Converter free?

Unit Converter is free to download, with in-app purchases available.

### Do kong calculator or Unit Converter have ads?

kong calculator shows ads; Unit Converter does not.

### Which is updated more often, kong calculator or Unit Converter?

kong calculator ships an update every 4 days, and Unit Converter every 2 weeks. Most recently, kong calculator was updated on October 27, 2026 and Unit Converter on October 25, 2026.

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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.*