DuctSizer Pro vs Ductulator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DuctSizer Pro
This tool quickly calculates HVAC duct sizes based on airflow and friction loss. It supports various duct shapes and provides key airflow values for field use.
- Calculate CFM from duct size
- Find duct sizes from CFM
- Supports square, round, and oval duct
- Shows velocity, friction, area, and equivalent round size
- Highlights suggested duct sizes
- Compares alternate duct sizes
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DuctSizer Pro is a fast HVAC duct sizing calculator built for field use. Enter duct dimensions and friction to calculate CFM, or enter CFM and friction to find suggested duct sizes. The app supports square, round, and oval ductwork and shows key airflow values such as velocity, friction, area, and equivalent round size. Features: - Calculate CFM from duct size - Find duct sizes from CFM - Supports square, round, and oval duct - Shows velocity, friction, area, and equivalent round size - Highlights suggested duct sizes - Compares alternate duct sizes for the same airflow DuctSizer Pro is designed as a quick reference tool for HVAC layout, estimating, and field calculations.
Ductulator
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Stop guessing duct sizes. Ductulator turns your airflow into the exact round or rectangular duct size you need — plus the friction rate, right from the job site. Built for HVAC contractors and DIY installs alike: • Round and rectangular sizing from CFM and target velocity, fully free • Reverse mode — already have a duct size on hand? See what airflow it can carry (Pro) • Branch calculator — size a trunk and every branch run at once, with a warning if they don't add up (Pro) • Every duct material — Galvanized, Flex Duct, PVC, Fiberboard (Pro) • Save sizings by job and share a polished PDF with your crew (Pro) No account, no ads, no guesswork — just the numbers you need before you cut metal. --- Privacy Policy: https://fosterapps.com/duct/privacy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is device support: Ductulator at 3 against DuctSizer Pro's 1. Ductulator also leads on iOS requirement (15.1 vs 17.6). On price, 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
Both are free to download. DuctSizer Pro sells 1 one-off in-app purchase and Ductulator sells 2 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.
DuctSizer Pro ships an update weekly, Ductulator every 8 days. The most recent releases landed on October 24, 2026 and October 14, 2026 respectively.
| Parameter | DuctSizer Pro | Ductulator |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Weekly — better | Every 8 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 5 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | LEONARDO NOVOA | Foster Apps LLC |
In-app purchases
DuctSizer Pro
- Catalog Pro$2.99
Ductulator
- Pro Weekly3 Days trial$3.997 Days
- Pro Yearly$19.991 Year
Questions
Is DuctSizer Pro free?
Is Ductulator free?
Do DuctSizer Pro or Ductulator have ads?
Which is updated more often, DuctSizer Pro or Ductulator?
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