# Units vs Unit Converter HVAC

The clearest difference is price: Units at Free against Unit Converter HVAC's $0.99. Unit Converter HVAC's advantage is ads (none vs shown) and iOS requirement (13.0 vs 17.0). On update cadence, in-app purchases and device support there is nothing between them.

Units is free to download; Unit Converter HVAC costs $0.99 up front. Units sells 3 one-off in-app purchases and Unit Converter HVAC sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Units ships an update monthly, Unit Converter HVAC every 3 weeks. The most recent releases landed on November 6, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Units | Unit Converter HVAC |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.1 (51 ratings)](https://appshunter.io/ios/app/units-pro-unit-converter/id284574017/reviews)** | — |
| Number of ratings | **51** | — |
| Positive reviews | 60.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 86 MB | 34 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Homegrown Software Ltd](https://appshunter.io/developer/406645730) | [Rizvan Adzhoian](https://appshunter.io/developer/1891746079) |

## 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, Vision Pro support

**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- 🕰️ Outdated currency conversion rates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


### Unit Converter HVAC

[App page](https://appshunter.io/ios/app/unit-converter-hvac/id6764647825)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |


## Frequently asked questions

### Is Units free?

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

### Is Unit Converter HVAC free?

Unit Converter HVAC costs $0.99, and also offers in-app purchases.

### Do Units or Unit Converter HVAC have ads?

Units shows ads; Unit Converter HVAC does not.

### Which is updated more often, Units or Unit Converter HVAC?

Units ships an update monthly, and Unit Converter HVAC every 3 weeks. Most recently, Units was updated on November 6, 2026 and Unit Converter HVAC on October 28, 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.*