# Bluon HVAC vs Diamondback Sizing Calculator

The clearest difference is ads: Diamondback Sizing Calculator at none against Bluon HVAC's shown. Diamondback Sizing Calculator also leads on iOS requirement (13.0 vs 15.1). Bluon HVAC's advantage is update cadence (monthly vs every 5 months). On price, in-app purchases and device support there is nothing between them.

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

Bluon HVAC ships an update monthly, Diamondback Sizing Calculator every 5 months. The most recent releases landed on September 24, 2026 and May 18, 2026 respectively.

## The numbers

| Metric | Bluon HVAC | Diamondback Sizing Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4.5K ratings)](https://appshunter.io/ios/app/bluon-hvac/id1357521880/reviews)** | — |
| Number of ratings | **4.5K** | — |
| Positive reviews | 55.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 5 months |
| Monetization | Ad-supported | — |
| Size | 170 MB | 46 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bluon, Inc.](https://appshunter.io/developer/1357521879) | [CB Supplies Ltd.](https://appshunter.io/developer/1645869774) |

## What reviewers say

### Bluon HVAC

[App page](https://appshunter.io/ios/app/bluon-hvac/id1357521880)

Access a vast database of HVAC models, manuals, and part lists to speed up your work. Utilize an AI-powered troubleshooting tool or connect with experienced technicians for real-time support.

**Highlights:** 500,000+ HVAC unit database, Manuals and part lists, AI troubleshooting tool (MasterMechanic), Live support from veteran techs, HVAC industry upgrade tools

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

**In-app purchases:** none

**What reviewers like**

- 🤖 Helpful tech support
- 💯 Comprehensive database of manuals and information
- 🛠️ Useful tools and calculators
- 🤝 Great customer service

**What reviewers complain about**

- 💰 Paywall for advanced features
- 🔒 Limited access without company account
- 🔍 Missing manuals for some equipment models
- 🗣️ Removal of helpful forums

**Reported bugs**

- Login/password reset issues
- Frequent crashes or loading problems

**Requested features**

- Individual technician subscription option
- More comprehensive coverage of HVAC equipment models
- Ability to access full manuals without restrictions


### Diamondback Sizing Calculator

[App page](https://appshunter.io/ios/app/diamondback-sizing-calculator/id1645869772)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Bluon HVAC free?

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

### Is Diamondback Sizing Calculator free?

Diamondback Sizing Calculator is free to download, with no in-app purchases.

### Do Bluon HVAC or Diamondback Sizing Calculator have ads?

Bluon HVAC shows ads; Diamondback Sizing Calculator does not.

### Which is updated more often, Bluon HVAC or Diamondback Sizing Calculator?

Bluon HVAC ships an update monthly, and Diamondback Sizing Calculator every 5 months. Most recently, Bluon HVAC was updated on September 24, 2026 and Diamondback Sizing Calculator on May 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.*