BTU Calculator vs Digiduct
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BTU Calculator
Estimate the cooling capacity needed for your data center. This tool considers factors like space, occupants, and heat output to help you maintain optimal temperature and humidity. It provides instant results as you update inputs, serving as a guide for system selection.
- Estimate cooling capacity
- Maintain 24°C and 30-50% humidity
- Consider space, occupants, window R-value
- Calculate total heat output
- Instant cooling load results
- Guide for system selection
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Choosing the right data center cooling system for your data center is essential to the success of all companies that depend on achieving business-critical continuity. The application uses a simple calculation method to estimate the cooling capacity you'll need to maintain a temperature of 24°C with a humidity level of between 30 and 50 percent for regions that have a climate which ranges from temperate to continental. The features included in this app: • will consider such factors as the amount of space to be cooled, the number of occupants, the orientation and R-value of windows, the total heat output of a data center and more. • allows you to instantly view total cooling load results as you update input data Please note that this calculator can only gauge a rough estimate. This application should only be used as a guide. As always you should always consult a professional and qualified contractor.
Digiduct
This HVAC tool assists professionals with duct sizing calculations based on ASHRAE standards. It supports multiple duct shapes and offers intelligent features to ensure accurate and reliable designs for real-world scenarios.
- Duct sizing for rectangular, round, and flat oval ducts
- Customizable dimensions with locked values
- Duct location intelligence for context-aware sizing
- Calculations based on CFM, pressure drop, or velocity
- Alerts for exceeding pressure drop or velocity limits
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The Digiduct app is a powerful tool designed for HVAC professionals, supporting everything from design calculations to real-time field verification. Built utilizing the equations and recommendations from the ASHRAE Fundamentals – Duct Design chapter, it ensures your calculations are accurate and reliable, saving you time and reducing errors. Key Features: • Multiple Shape Sizing Options: Supports sizing for rectangular, round, and flat oval ducts, offering flexibility for various duct designs. • Customizable Dimensions: For rectangular and oval ducts, users can lock in one dimension, and the app calculates the other, ensuring precise results based on CFM, pressure drop due to friction, or velocity. • Duct Location Intelligence: offers the user predefined parameters to use as starting point and reference when selecting duct sizes so users at HVAC experience level can make confident selections. Why Choose Digiduct? Unlike other duct sizing tools, Digiduct goes above and beyond. It doesn’t just provide basic size outputs—it evaluates the location and context of your duct (high-pressure vs. low-pressure, shaft vs. plenum), alerting you if your selection exceeds maximum pressure drop or velocity limits. This added layer of intelligence ensures higher accuracy and gives users confidence that their sizing is optimal for the application. Get the assurance of precision with Digiduct—designed to meet the demands of real-world HVAC scenarios.
Screenshots
Verdict
The clearest difference is in-app purchases: Digiduct at none against BTU Calculator's 1. Digiduct also leads on ads (none vs shown). BTU Calculator's advantage is ratings volume (318 vs 11) and iOS requirement (12.0 vs 26.2). On price, rating, update cadence 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
Both are free to download. BTU Calculator sells 1 one-off in-app purchase. Digiduct asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.6 for BTU Calculator against 4.6 for Digiduct. That said, the two scores are not equally well evidenced: BTU Calculator has 318 ratings behind it against 11, so its average is the more settled of the two.
BTU Calculator ships an update every 4 months, Digiduct every 2 months. The most recent releases landed on October 22, 2026 and October 16, 2026 respectively.
| Parameter | BTU Calculator | Digiduct |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (318 ratings) | 4.6 (11 ratings) — better |
| Positive reviews | 68.8% of reviews | — |
| Number of ratings | 318 — better | 11 |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 26.2 |
| Further details — not scored | ||
| Size | 23 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Cristinel Bontas | Syska Hennessy Group |
Customer experience
BTU Calculator
Digiduct
In-app purchases
BTU Calculator
- Remove Ads$0.99
Digiduct
No in-app purchases
Questions
Is BTU Calculator free?
Is Digiduct free?
Which has better reviews, BTU Calculator or Digiduct?
Do BTU Calculator or Digiduct have ads?
Which is updated more often, BTU Calculator or Digiduct?
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