# US Unit Converter vs Capt'OI

The clearest difference is in-app purchases: Capt'OI at none against US Unit Converter's 1. Capt'OI also leads on ads (none vs shown) and update cadence (every 4 weeks vs every 6 months). On price and device support there is nothing between them.

Both are free to download. US Unit Converter sells 1 one-off in-app purchase. Capt'OI asks for nothing beyond the download.

US Unit Converter ships an update every 6 months, Capt'OI every 4 weeks. The most recent releases landed on October 22, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | US Unit Converter | Capt'OI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (110 ratings)](https://appshunter.io/ios/app/us-unit-converter/id1577905442/reviews)** | — |
| Number of ratings | **110** | — |
| Positive reviews | 44.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 29 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kei Suefuji](https://appshunter.io/developer/1388335881) | [Agence Digitale Iroko](https://appshunter.io/developer/898569205) |

## What reviewers say

### US Unit Converter

[App page](https://appshunter.io/ios/app/us-unit-converter/id1577905442)

Easily convert between US customary units and the International System of Units for various measurements like length, weight, area, volume, and temperature. Access conversion history and remove ads with a premium upgrade.

**Highlights:** Length conversion, Weight conversion, Area conversion, Liquid volume conversion, Temperature conversion, Conversion history, Ad-free option

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PREMIUM | $3.99 | one-time |


### Capt'OI

[App page](https://appshunter.io/ios/app/captoi/id6762108046)

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

**In-app purchases:** none


## Frequently asked questions

### Is US Unit Converter free?

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

### Is Capt'OI free?

Capt'OI is free to download, with no in-app purchases.

### Do US Unit Converter or Capt'OI have ads?

US Unit Converter shows ads; Capt'OI does not.

### Which is updated more often, US Unit Converter or Capt'OI?

US Unit Converter ships an update every 6 months, and Capt'OI every 4 weeks. Most recently, US Unit Converter was updated on October 22, 2026 and Capt'OI on October 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*