The B vs Ductulator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
The B
This app serves HVAC/R contractors with a comprehensive resource for products, expert support, and troubleshooting. It offers training, NATE testing, and field tools, representing hundreds of manufacturers across Michigan and Northwest Ohio.
- Vast product inventory
- Expert support and troubleshooting
- Contractor training
- NATE testing
- Field tools and calculators
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Behler-Young is the complete source for the HVAC/R™ contractor. This means that in addition to our vast inventory of products, we provide expert support and troubleshooting, training for our customers, NATE testing, tools and calculators you can use in the field and on the job, and more! B-Y represents hundreds of manufacturers and we serve thousands of customers throughout Michigan and Northwest Ohio, through 16 branches and a 150,000 square foot distribution center in Kensington Park.
Ductulator
Instantly calculate HVAC duct sizes based on airflow, friction rate, or velocity. This tool provides accurate duct dimensions in seconds without needing charts, supporting various duct types and units.
- Instant duct sizing
- Friction rate or velocity calculation
- Multiple valid duct dimensions
- IP and SI units support
- Detailed sizing mode
- Rectangular, circular, and flexible ducts
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Size HVAC ducts instantly using airflow, friction or velocity. Get accurate duct dimensions in seconds — no charts required. • Get a range of suitable duct sizes based on friction rate or velocity. • Get multiple valid duct dimensions instantly. • Tap on Friction Rate or Velocity to toggle between calculation methods. • IP and SI units. • Detailed sizing mode to adjust the duct dimensions and air flow rates. • Supports rectangular, circular and flexible ducts. • Automatic friction and velocity updates. Calculations are based on standard air 0.075 lb/ft3 (1.2 kg/m3) in clean galvanized steel or non-metallic flexible ducts. Any feedback is welcome, and will be the basis for future updates.
Screenshots
Verdict
The clearest difference is review sentiment: The B at 100% against Ductulator's 50%. The B also leads on price (Free vs $3.99) and rating (5.0 vs 4.7). Ductulator's advantage is ads (none vs shown) and ratings volume (358 vs 4). 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
The B is free to download; Ductulator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
The B holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Ductulator has 358 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 100% of The B's written reviews are positive against 50% of Ductulator's.
The B ships an update every 9 months, Ductulator every 2 months. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.
| Parameter | The B | Ductulator |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 5.0 (4 ratings) — better | 4.7 (358 ratings) |
| Positive reviews | 100.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 4 | 358 — better |
| Update frequency | Every 9 months | Every 2 months — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Best chart rank | — | #51 — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 6 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | The Behler-Young Company | Wassim Murr |
Customer experience
The B
Ductulator
Bugs and requests
The B
Not enough reviews yet to summarise bugs or requests.
Ductulator
Reported bugs
4 issues- Decimal point doesn't work on calculator
- New flex option isn't working properly
- Friction rate can't be changed in the latest version
- Skips duct sizes (e.g., 24-26)
Requested features
5 requests- Ability to pick duct size and see CFM
- Include flat oval ducts
- Option to select round or square duct
- Ability to enter duct size and get CFM
- Option for flex duct
In-app purchases
The B
No in-app purchases
Ductulator
No in-app purchases
