# Ref Tools vs Unit Converter HVAC

The clearest difference is price: Ref Tools at Free against Unit Converter HVAC's $0.99. Ref Tools also leads on in-app purchases (none vs 1). Unit Converter HVAC's advantage is iOS requirement (13.0 vs 15.0). On update cadence, ads and device support there is nothing between them.

Ref Tools is free to download; Unit Converter HVAC costs $0.99 up front. Unit Converter HVAC sells 1 one-off in-app purchase. Ref Tools asks for nothing beyond the download.

Ref Tools ships an update every 5 weeks, Unit Converter HVAC every 3 weeks. The most recent releases landed on October 17, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Ref Tools | Unit Converter HVAC |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[3.9 (52 ratings)](https://appshunter.io/ios/app/ref-tools/id472312541/reviews)** | — |
| Number of ratings | **52** | — |
| Positive reviews | 57.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 98 MB | 34 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Danfoss A/S](https://appshunter.io/developer/423984644) | [Rizvan Adzhoian](https://appshunter.io/developer/1891746079) |

## What reviewers say

### Ref Tools

[App page](https://appshunter.io/ios/app/ref-tools/id472312541)

This app provides HVACR technicians with essential tools and information for field service. It includes refrigerant calculators, troubleshooting guides, product finders, and access to spare parts. Listen to educational podcasts to enhance your knowledge on the go.

**Highlights:** Refrigerant Slider for P/T calculations, Solenoid valve coil testing tool, Refrigeration system troubleshooting guide, Product data finder, Spare parts ordering, Low-GWP refrigerant comparison, TXV Superheat optimization, Educational podcasts

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

**In-app purchases:** none

**What reviewers like**

- 👍 Useful tool for HVAC/R techs
- 👍 Great idea for an app
- 👍 Best refrigeration and hvac app
- 👍 Useful App for HVACR
- 👍 Brilliant app

**What reviewers complain about**

- 🐛 Crashes instantly on launch
- 🐛 App won’t open on iPhone
- 🐛 Flashes up and disappears
- 🐛 Cannot open app
- 🐛 Immediately shuts off

**Reported bugs**

- CRASHED instantly on Mac Mini M4
- App won’t open on iPhone
- App flashes up and disappears
- Cannot open app
- Immediately shuts off since recent release

**Requested features**

- More residential AC information
- Troubleshooter for Residential & Commercial
- Add SP22 refrigerant
- Add R-11 refrigerant
- Add R-123 range down to 40 degrees


### 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 Ref Tools free?

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

### Is Unit Converter HVAC free?

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

### Do Ref Tools or Unit Converter HVAC have ads?

Neither Ref Tools nor Unit Converter HVAC shows ads.

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

Ref Tools ships an update every 5 weeks, and Unit Converter HVAC every 3 weeks. Most recently, Ref Tools was updated on October 17, 2026 and Unit Converter HVAC on October 18, 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.*