ASHRAE 365 vs Ductulator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ASHRAE 365
Access ASHRAE information year-round. Stay updated on global conferences and events, connect with the community via social media, and discover resources to support the Society.
- Conference and event updates
- Social media integration
- Resource discovery
- Society support information
- Year-round access
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ASHRAE 365 is your year-round app for ASHRAE information. Stay up-to-date on upcoming worldwide conferences and events, connect with others through social media, find resources, and learn how to support the Society.
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: Ductulator at 50% against ASHRAE 365's 0%. Ductulator also leads on rating (4.7 vs 4.2) and ratings volume (358 vs 10). ASHRAE 365's advantage is price (Free vs $3.99). On update cadence, ads, 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
ASHRAE 365 is free to download; Ductulator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Ductulator holds the better App Store score, 4.7 against 4.2. That said, the two scores are not equally well evidenced: Ductulator has 358 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 0% of ASHRAE 365's written reviews are positive against 50% of Ductulator's.
ASHRAE 365 ships an update every 4 months, Ductulator every 2 months. The most recent releases landed on October 27, 2026 and October 29, 2026 respectively.
| Parameter | ASHRAE 365 | Ductulator |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 4.2 (10 ratings) | 4.7 (358 ratings) — better |
| Positive reviews | 0.0% of reviews | 50.0% of reviews — better |
| Number of ratings | 10 | 358 — better |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Best chart rank | — | #58 — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 — better | 18.6 |
| Further details — not scored | ||
| Size | 53 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | ASHRAE, Inc. | Wassim Murr |
Customer experience
ASHRAE 365
Ductulator
Bugs and requests
ASHRAE 365
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
ASHRAE 365
No in-app purchases
Ductulator
No in-app purchases
Questions
Is ASHRAE 365 free?
Is Ductulator free?
Which has better reviews, ASHRAE 365 or Ductulator?
Do ASHRAE 365 or Ductulator have ads?
Which is updated more often, ASHRAE 365 or Ductulator?
Other comparisons
