Engineering Converter vs Duct Construction
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Engineering Converter
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This engineering converter provides basic conversions between units of measure for common and engineering units. This app has the capability to convert units for the following types of measurement: Temperature Length Mass Mole Area Volume Time Velocity Acceleration Density Molar Density Molar Volume Force Pressure Energy Power Mass Flow Mole Flow Volume Flow Heat Capacity Molar Heat Capacity Latent Heat Molar Latent Heat Conductivity Viscosity Diffusivity Surface Tension
Duct Construction
This app helps determine duct construction and reinforcement options based on duct size and system pressure class. It provides condensed lists of suitable options, saving time spent on manual calculations and table lookups. Results are based on industry standards for galvanized steel duct sheets.
- Duct size range from 2" to 120"
- Pressure classes up to 4 in.wg
- Calculates duct weights per linear foot
- Determines required duct gauge and reinforcement spacing
- Clear illustrations for reinforcement types
- Simple and effective UI design
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Get all duct construction and reinforcement options by entering the duct size and system pressure class. The aim of the app is to save time spent browsing through tables and texts to determine suitable options, by relying on the most widely used standards and providing a condensed list of available duct construction options. The results are based on galvanized steel duct sheets conforming to ASTM A653 & A924. The app does not cover all aspects of duct construction, as it is intended as a guide; Reliance on related standards, as well as good engineering sense is the basis for proper design. Features: 1. Duct sizes from 2" to 120" 2. Pressure classes 0.5 in.wg, 1 in.wg, 2 in.wg, 3 in.wg and 4 in.wg. 3. Provides the duct weights for each option per linear foot. 4. Provides required duct gauge and reinforcement spacing. 5. Clear illustration for each reinforcement type, as well as dimensions. 6. Simple and effective UI design. Roadmap / Upcoming updates: 1. SI units. 2. More pressure class options. 3. User will be able to save and retreive duct data for future reference. 3. More Reinforcement options, including tie-rodding. Request a feature: welmurr@icloud.com
Screenshots
Verdict
The clearest difference is price: Engineering Converter at Free against Duct Construction's $0.99. Engineering Converter also leads on iOS requirement (15.0 vs 17.6). Duct Construction's advantage is ads (none vs shown) and update cadence (every 10 months vs every 42 months). On in-app purchases and device support 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
Engineering Converter is free to download; Duct Construction costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Engineering Converter ships an update every 42 months, Duct Construction every 10 months. The most recent releases landed on September 12, 2026 and September 25, 2026 respectively.
| Parameter | Engineering Converter | Duct Construction |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | — | 1.0 (1 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 42 months | Every 10 months — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Best chart rank | — | #184 — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 6 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Brook Wallace | Wassim Murr |
In-app purchases
Engineering Converter
No in-app purchases
Duct Construction
No in-app purchases
Questions
Is Engineering Converter free?
Is Duct Construction free?
Do Engineering Converter or Duct Construction have ads?
Which is updated more often, Engineering Converter or Duct Construction?
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