# Ductulate HD vs HVAC Decoder

The clearest difference is rating: Ductulate HD at 4.9 against HVAC Decoder's 4.0. Ductulate HD also leads on review sentiment (93% vs 69%) and price ($7.99 vs $9.99). HVAC Decoder's advantage is chart position (#170 vs unranked) and device support (3 vs 1). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Ductulate HD costs $7.99 and HVAC Decoder $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Ductulate HD holds the better App Store score, 4.9 against 4.0. Both are backed by a comparable volume of ratings — 23 and 28 respectively. Written reviews point the same way: 93% of Ductulate HD's written reviews are positive against 69% of HVAC Decoder's.

Ductulate HD ships an update every 4 months, HVAC Decoder every 3 months. The most recent releases landed on October 6, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Ductulate HD | HVAC Decoder |
| --- | --- | --- |
| Price | **$7.99** | $9.99 |
| Rating | **[4.9 (23 ratings)](https://appshunter.io/ios/app/ductulate-hd/id441054001/reviews)** | [4.0 (28 ratings)](https://appshunter.io/ios/app/hvac-decoder/id1355543096/reviews) |
| Number of ratings | 23 | **28** |
| Positive reviews | **92.6% of reviews** | 68.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#170** |
| Size | 33 MB | 6 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Steven Ramsay](https://appshunter.io/developer/415008343) | [Charles Cope](https://appshunter.io/developer/1355543095) |

## What reviewers say

### Ductulate HD

[App page](https://appshunter.io/ios/app/ductulate-hd/id441054001)

This app helps HVAC engineers quickly calculate duct size, air volume, pressure loss, and velocity. It supports both imperial and metric units and offers features like scroll lock and customizable themes.

**Highlights:** Calculate duct size, air volume, pressure loss, velocity, Supports imperial and metric units, Scroll Lock for accidental touch prevention, Typical velocity reference chart, Customizable themes and company logo support, Favorite measurement markers

**Features:** macOS Compatibility

**In-app purchases:** none


### HVAC Decoder

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

**Currently charting:** #170 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 Ductulate HD free?

Ductulate HD costs $7.99, with no in-app purchases.

### Is HVAC Decoder free?

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

### Which has better reviews, Ductulate HD or HVAC Decoder?

Ductulate HD is rated higher. Ductulate HD averages 4.9 out of 5 from 23 ratings, while HVAC Decoder averages 4.0 from 28 ratings.

### Do Ductulate HD or HVAC Decoder have ads?

Neither Ductulate HD nor HVAC Decoder shows ads.

### Which is updated more often, Ductulate HD or HVAC Decoder?

Ductulate HD ships an update every 4 months, and HVAC Decoder every 3 months. Most recently, Ductulate HD was updated on October 6, 2026 and HVAC Decoder on October 7, 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.*