# Unit Converter vs CAI Mobile App

The clearest difference is in-app purchases: CAI Mobile App at none against Unit Converter's 10. CAI Mobile App also leads on ads (none vs shown) and iOS requirement (13.0 vs 17.0). Unit Converter's advantage is update cadence (weekly vs every 8 months). On price and device support there is nothing between them.

Both are free to download. Unit Converter sells 10 in-app purchases, starting at $0.99 per 7 days. CAI Mobile App asks for nothing beyond the download.

Unit Converter ships an update weekly, CAI Mobile App every 8 months. The most recent releases landed on October 24, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Unit Converter | CAI Mobile App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (9 ratings)](https://appshunter.io/ios/app/unit-converter-science-tools/id1557454960/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 8 months |
| Monetization | Free with in-app purchases | — |
| Size | 19 MB | 71 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Eugene Kugut](https://appshunter.io/developer/1557454962) | [Livro Systems Incorporated](https://appshunter.io/developer/1896544025) |

## What reviewers say

### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-science-tools/id1557454960)

This app offers over 30 unit converters for science, engineering, and everyday use. It features advanced options like adjustable rounding, smart search, and calculation history, with customizable themes and an iPad-optimized interface.

**Highlights:** Over 30 unit converters, Adjustable rounding, Smart search by name or units, Copy/paste values, Swap units with one button, Calculation history, Customizable themes

**Features:** Family Sharing

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium access | $0.99 | per 7 days |
| Premium access | $0.99 | per month |
| Premium access | $1.99 | per 7 days |
| Premium access | $1.99 | per month |
| Premium access | $2.99 | per month |
| Premium access | $8.99 | per year |
| Premium access | $9.99 | per year |
| Premium access | $17.99 | per year |
| Premium access | $19.99 | per year |
| Premium access | $44.99 | one-time |


### CAI Mobile App

[App page](https://appshunter.io/ios/app/cai-mobile-app/id6744206935)

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

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter free?

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

### Is CAI Mobile App free?

CAI Mobile App is free to download, with no in-app purchases.

### Do Unit Converter or CAI Mobile App have ads?

Unit Converter shows ads; CAI Mobile App does not.

### Which is updated more often, Unit Converter or CAI Mobile App?

Unit Converter ships an update weekly, and CAI Mobile App every 8 months. Most recently, Unit Converter was updated on October 24, 2026 and CAI Mobile App on October 4, 2026.

---

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