DuctChecker vs Lupin meter
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
DuctChecker
Easily calculate duct dimensions using various engineering methods like constant pressure, static pressure regain, total pressure, and velocity. This tool simplifies complex duct design calculations, typically found in flow diagrams or slide rules.
- Constant pressure method calculation
- Static pressure regain method
- Total pressure method
- Velocity method
- Duct dimension determination
- Simplified duct design
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To determine the size of the duct constant pressure method, static pressure regain method, total pressure method, velocity method. Generally uses constant pressure method. This constant pressure method is how to determine the duct dimensions using the same value per 1 m on all duct friction loss. Usually determined by flow diagrams or duct design for slide rules. You can easily determine the duct by using this program.
Lupin meter
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Screenshots
Verdict
The clearest difference is price: Lupin meter at Free against DuctChecker's $6.99. Lupin meter also leads on iOS requirement (8.0 vs 15.0). On update cadence, ads, in-app purchases and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Lupin meter is free to download; DuctChecker costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.
DuctChecker ships an update every 4 months, Lupin meter every 3 months. The most recent releases landed on October 24, 2026 and October 11, 2026 respectively.
| Parameter | DuctChecker | Lupin meter |
|---|---|---|
| Price | $6.99 | Free ā better |
| Positive reviews | 0.0% of reviews | ā |
| Update frequency | Every 4 months | Every 3 months ā better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | ā |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 8.0 ā better |
| Further details ā not scored | ||
| Size | 23 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | AIR DESIGN, INC. | Endo Lighting Corp. |
In-app purchases
DuctChecker
No in-app purchases
Lupin meter
No in-app purchases
Questions
Is DuctChecker free?
Is Lupin meter free?
Do DuctChecker or Lupin meter have ads?
Which is updated more often, DuctChecker or Lupin meter?
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