# Duct Calculator Elite vs HVAC Decoder

The clearest difference is rating: Duct Calculator Elite at 4.8 against HVAC Decoder's 4.0. Duct Calculator Elite also leads on ratings volume (232 vs 28). HVAC Decoder's advantage is update cadence (every 3 months vs every 15 months) and review sentiment (69% vs 50%). On price, ads, in-app purchases and monetization model there is nothing between them.

Duct Calculator Elite costs $9.99 and HVAC Decoder $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Duct Calculator Elite holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Duct Calculator Elite has 232 ratings behind it against 28, so its average is the more settled of the two. Written reviews complicate that: 50% of Duct Calculator Elite's written reviews are positive against 69% of HVAC Decoder's, so the app with the better star average is not the one people write more warmly about.

Duct Calculator Elite ships an update every 15 months, HVAC Decoder every 3 months. The most recent releases landed on September 28, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Duct Calculator Elite | HVAC Decoder |
| --- | --- | --- |
| Price | $9.99 | $9.99 |
| Rating | **[4.8 (232 ratings)](https://appshunter.io/ios/app/duct-calculator-elite/id665701601/reviews)** | [4.0 (28 ratings)](https://appshunter.io/ios/app/hvac-decoder/id1355543096/reviews) |
| Number of ratings | **232** | 28 |
| Positive reviews | 50.0% of reviews | **68.8% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#200** |
| Size | 13 MB | 6 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Cyberprodigy LLC](https://appshunter.io/developer/510284906) | [Charles Cope](https://appshunter.io/developer/1355543095) |

## What reviewers say

### Duct Calculator Elite

[App page](https://appshunter.io/ios/app/duct-calculator-elite/id665701601)

This app simplifies HVAC duct sizing calculations. It computes duct size, velocity, pressure drop, and flow rate with an intuitive interface. Supports various units and duct materials for precise HVAC design.

**Highlights:** Calculate duct size, velocity, pressure drop, flow rate, Duct Size by Airflow mode, Duct Size by Dimension mode, Pressure Drop calculations, Customizable units and duct materials, Uses ASHRAE Handbook friction loss equations

**Features:** macOS Compatibility

**In-app purchases:** none


### HVAC Decoder

[App page](https://appshunter.io/ios/app/hvac-decoder/id1355543096)

**Currently charting:** #200 Top Paid · Utilities (US App Store)

Decode HVAC model and serial numbers from major brands. This utility app provides thousands of model numbers and can email search results. It supports a wide range of HVAC equipment and offers close matches for unknown numbers.

**Highlights:** Decode HVAC model numbers, Decode HVAC serial numbers, Supports major HVAC brands, Thousands of model numbers, Email search results, Close match functionality, Report missing data

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

**In-app purchases:** none


## Frequently asked questions

### Is Duct Calculator Elite free?

Duct Calculator Elite costs $9.99, with no in-app purchases.

### Is HVAC Decoder free?

HVAC Decoder costs $9.99, with no in-app purchases.

### Which has better reviews, Duct Calculator Elite or HVAC Decoder?

Duct Calculator Elite is rated higher. Duct Calculator Elite averages 4.8 out of 5 from 232 ratings, while HVAC Decoder averages 4.0 from 28 ratings.

### Do Duct Calculator Elite or HVAC Decoder have ads?

Neither Duct Calculator Elite nor HVAC Decoder shows ads.

### Which is updated more often, Duct Calculator Elite or HVAC Decoder?

Duct Calculator Elite ships an update every 15 months, and HVAC Decoder every 3 months. Most recently, Duct Calculator Elite was updated on September 28, 2026 and HVAC Decoder on September 21, 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.*