# Units vs All Unit Conversion

The clearest difference is rating: All Unit Conversion at 4.6 against Units's 3.6. All Unit Conversion also leads on in-app purchases (none vs 3) and ads (none vs shown). Units's advantage is ratings volume (150 vs 17) and review sentiment (60% vs 50%). On price and update cadence there is nothing between them.

Both are free to download. Units sells 3 one-off in-app purchases. All Unit Conversion asks for nothing beyond the download.

All Unit Conversion holds the better App Store score, 4.6 against 3.6. That said, the two scores are not equally well evidenced: Units has 150 ratings behind it against 17, so its average is the more settled of the two. Written reviews complicate that: 60% of Units's written reviews are positive against 50% of All Unit Conversion's, so the app with the better star average is not the one people write more warmly about.

Units ships an update monthly, All Unit Conversion every 2 months. The most recent releases landed on September 22, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Units | All Unit Conversion |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (150 ratings)](https://appshunter.io/ios/app/units-pro-unit-converter/id284574017/reviews) | **[4.6 (17 ratings)](https://appshunter.io/ios/app/all-unit-conversion/id1418597453/reviews)** |
| Number of ratings | **150** | 17 |
| Positive reviews | **60.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 2 MB | 22 MB |
| Requires iOS | **13.5** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Homegrown Software Ltd](https://appshunter.io/developer/406645730) | [Tiago Do Couto](https://appshunter.io/developer/1291604717) |

## What reviewers say

### Units

[App page](https://appshunter.io/ios/app/units-pro-unit-converter/id284574017)

Easily convert between hundreds of units across 43 categories, including currency with daily updated rates. Customize your workflow by hiding or reordering units and categories.

**Highlights:** Hundreds of units across 43 categories, Daily updated currency exchange rates, Hide unused units, Reorder units and categories, Universal app support (iPhone, iPod touch, iPad)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Medium Tip | $2.99 | one-time |
| Large Tip | $4.99 | one-time |

**What reviewers like**

- 🚀 Efficient and fast conversions
- 👍 Comprehensive list of units
- 🔍 Customizable unit selection
- 💰 Free app with optional paid version
- 🔧 Useful for engineering and technical work

**What reviewers complain about**

- 🐛 Crashes and stability issues
- 🕰️ Outdated currency conversion rates
- 🔍 Too many unit categories, hard to navigate
- 💰 Ads in free version
- 📏 Ruler feature not accurate on some devices

**Reported bugs**

- Crashes when clearing input fields
- Numerical keypad covers conversion results
- Incompatibility issues with newer iOS versions
- Ruler measurements not accurate on all devices

**Requested features**

- Add nautical units (miles, knots)
- Improve currency conversion accuracy and updates
- Allow customization of visible unit categories
- Add more clothing/shoe size conversions
- Improve user interface and search functionality


### All Unit Conversion

[App page](https://appshunter.io/ios/app/all-unit-conversion/id1418597453)

Easily convert between various units of measurement with this free utility app. It supports conversions for length, area, volume, mass, time, digital storage, energy, and currency.

**Highlights:** Length conversion, Area conversion, Volume conversion, Mass conversion, Time conversion, Currency conversion

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Units free?

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

### Is All Unit Conversion free?

All Unit Conversion is free to download, with no in-app purchases.

### Which has better reviews, Units or All Unit Conversion?

All Unit Conversion is rated higher. Units averages 3.6 out of 5 from 150 ratings, while All Unit Conversion averages 4.6 from 17 ratings.

### Do Units or All Unit Conversion have ads?

Units shows ads; All Unit Conversion does not.

### Which is updated more often, Units or All Unit Conversion?

Units ships an update monthly, and All Unit Conversion every 2 months. Most recently, Units was updated on September 22, 2026 and All Unit Conversion on September 13, 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.*