# Unit Converter | Converter4U vs Gauge

The clearest difference is device support: Unit Converter | Converter4U at 3 against Gauge's 1. Unit Converter | Converter4U also leads on iOS requirement (9.0 vs 18.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Unit Converter | Converter4U ships an update every 4 months, Gauge every 3 months. The most recent releases landed on October 26, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Unit Converter | Converter4U | Gauge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (194 ratings)](https://appshunter.io/ios/app/unit-converter-converter4u/id620969788/reviews)** | — |
| Number of ratings | **194** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 51 MB | 5 MB |
| Requires iOS | **9.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [VisTech.Projects LLC](https://appshunter.io/developer/620969851) | [Peter Bruce](https://appshunter.io/developer/889627600) |

## What reviewers say

### Unit Converter | Converter4U

[App page](https://appshunter.io/ios/app/unit-converter-converter4u/id620969788)

This app provides a powerful and intuitive way to convert between a wide range of units, including length, weight, temperature, and more. It offers simultaneous conversion of multiple units and customizable options for a personalized experience. Get instant, accurate results for all your conversion needs.

**Highlights:** Simultaneous multi-unit conversion, Customizable unit options, Copy converted values to clipboard, Supports numerous measurement categories, Intuitive and user-friendly interface

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

**In-app purchases:** none

**What reviewers like**

- 👍 Best free app
- 👍 Simple and precise
- 👍 Super!
- 👍 The best program!
- 👍 Great App

**What reviewers complain about**

- 🐛 Missing PSI conversion
- 🐛 Lacks quarts and gallons for volume
- 🐛 Precision issues with imperial units
- 🐛 Cumbersome UI
- 🐛 Limited conversion types

**Reported bugs**

- Input values not appearing
- White text on white background
- No numbers shown on iPhone 12 mini
- Precision issues with imperial units

**Requested features**

- Landscape display
- More conversion types/categories
- Support for PSI
- Support for quarts and gallons
- Improved precision for imperial units


### Gauge

[App page](https://appshunter.io/ios/app/gauge/id6503662052)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter | Converter4U free?

Unit Converter | Converter4U is free to download, with no in-app purchases.

### Is Gauge free?

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

### Do Unit Converter | Converter4U or Gauge have ads?

Neither Unit Converter | Converter4U nor Gauge shows ads.

### Which is updated more often, Unit Converter | Converter4U or Gauge?

Unit Converter | Converter4U ships an update every 4 months, and Gauge every 3 months. Most recently, Unit Converter | Converter4U was updated on October 26, 2026 and Gauge on October 3, 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.*