HVAC vs CURB deviation
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC
This app provides quick and easy calculations for HVAC professionals and enthusiasts. It simplifies complex formulas for energy use, airflow, and duct dimensions, making them accessible on your iPhone or iPad.
- SFP calculations
- Heat recovery efficiency
- Air velocity in ducts
- Duct dimensioning
- Pressure drop calculations
- Equivalent diameters
Read full descriptionHide full description
HVAC Calculator is an app that performs many calculations that are useful to have available for anyone working with or have interest in HVAC and energy use in buildings. The app performs many of the calculations that you never remember the formulas for when you need them for quick calculations, for example in a meeting or out on the construction site. Many of the calculations can also be a bit difficult to calculate with a normal calculator. Now you can perform these calculations easily on your iPhone/iPad. The app is universal, so you only have to buy it once to use it on both iPhone and iPad. The app helps you calculate all this and more: -SFP from measured/design fan power and airflow -SFP at reduced airflow for VAV ventilation -SFP at design conditions or maximum performance for VAV ventilation -Temperature efficiency of heat recovery -Temperature after heat recovery unit (HRU) in air handling unit (AHU) -Temperature of exhaust air from air handling unit after heat recovery -Actual temperature efficiency of heat recovery when the exhaust temperature is limited to minimum 5°C for reuse as frost free garage ventilation -Air velocity in ducts with known dimensions and airflow -Maximum airflow in a duct with dimensions and maximum air velocity as specified requirements -Dimensions of rectangular and circular spiral ducts for specified air flow and velocity requirements -Pressure drop in Pa/m for rectangular and circular spiral ducts -Equivalent diameters for rectangular ducts -Hydraulic diameter for rectangular ducts
CURB deviation
Read full descriptionHide full description
CURB is the mobile app for CoPro's deviation solution, part of the CoPro Quality Management Suite. Register HSE deviations, quality deviations, improvements or any other type of registration your organisation sets up in the CURB web application. Choose a form, describe the deviation, take pictures or video and attach files – then submit it, and it's instantly available in CURB as part of your company's improvement work. You can also draw directly on your photos with your fingertip to highlight exactly what matters. The app has a brand new, modern design that makes registering faster and easier. We update it regularly – download the latest version to get all the new features. Thank you for using CURB!
Screenshots
Verdict
The clearest difference is price: CURB deviation at Free against HVAC's $4.99. CURB deviation also leads on update cadence (every 3 weeks vs every 5 months). On ads, in-app purchases, device support and iOS requirement 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
CURB deviation is free to download; HVAC costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
HVAC ships an update every 5 months, CURB deviation every 3 weeks. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.
| Parameter | HVAC | CURB deviation |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 14 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Trond Rossvoll | CoPro Live AS |
In-app purchases
HVAC
No in-app purchases
CURB deviation
No in-app purchases









