Ductulate HD vs HVAC Decoder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ductulate HD
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.
- 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
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*** NOW INCLUDES IMPERIAL UNITS *** Ductulate HD brings the "Duct Design Calculator" to the iPad. Designed for the HVAC engineer in mind, it can be used exactly the same way as the original "Duct Design Calculator". Ductulate HD provides a quick and simple way to calculate any combination of air volume, pressure loss, velocity and duct size (rectangular or round). Imperial units: - Air Volume, CFM, - Velocity, FPM - Pressure Loss, Inches of H2O - Dimensions, Inches Metric units: - Air Volume, L/sec, - Velocity, m/sec - Pressure Loss, Pa - Dimensions, mm Features: - Scroll Lock to avoid "accidental touches" - Typical velocity reference chart - Clear, easy to read values - Multiple themes to customize the look and feel Markers: - Ability to set a mark to a favorite measurement of Pressure Loss and Velocity for quick reference. Logo Support: - Ability to customize any theme with your company logo/image.
HVAC Decoder
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.
- 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
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This app will decode the model number nomenclature of most HVAC companies. It has all the major brand names with many thousands of model numbers. It will also decode the serial number for many HVAC companies. It has the ability to email the search results in HTML format via an installed mail client. App is effective at decoding model and serial numbers for packaged units, air conditioners / condensing units, air handlers, evaporator coils, furnaces, heat pumps, boilers, chillers, split systems / mini splits, geothermal systems, and more. If the model number is not found exactly it will try a close match. If there is no close match it will give you the option to report missing data. The data is constantly updated and purchase of the app gets you free updates forever.
Screenshots
Verdict
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 (#161 vs unranked) and device support (3 vs 1). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Ductulate HD | HVAC Decoder |
|---|---|---|
| Price | $7.99 — better | $9.99 |
| Rating | 4.9 (23 ratings) — better | 4.0 (28 ratings) |
| Positive reviews | 92.6% of reviews — better | 68.8% of reviews |
| Number of ratings | 23 | 28 — better |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | — | #161 — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 33 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Steven Ramsay | Charles Cope |
Customer experience
Ductulate HD
HVAC Decoder
In-app purchases
Ductulate HD
No in-app purchases
HVAC Decoder
No in-app purchases
Questions
Is Ductulate HD free?
Is HVAC Decoder free?
Which has better reviews, Ductulate HD or HVAC Decoder?
Do Ductulate HD or HVAC Decoder have ads?
Which is updated more often, Ductulate HD or HVAC Decoder?
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