Comparison

HVAC vs Interaxo Field

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • SFP calculations
  • Heat recovery efficiency
  • Air velocity in ducts
  • Duct dimensioning
  • Pressure drop calculations
  • Equivalent diameters
Features
Read 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

About

Interaxo Field

Features
Read full description

Interaxo Field supports your way of planning, working and reporting in the field. The Interaxo Field mission is about digitizing field construction processes in close co-operation with our customers and partners in the industry. We contribute to safer, more productive and more sustainable construction projects. Efficient collaboration between customers, contractors, consultants and the supply chain, results in higher quality, lower costs and projects delivered on time. The process is just as important in all construction phases. Interaxo Field comes with a number of configurable checklists and issue types to get started in a minute. Both checklists and issue types can be tailored to meet specific demands or workflows. The value of mobile access to drawings, document, BIM viewer and data for everyone at site is very big! It makes it easy to collaborate, build according to design, resolve issues and find answers when they arise without delays. Empower all teams with Interaxo Field and build a positive and proactive culture, they only need one app. Interaxo Field solutions: - Drawings and BIM on site - Inspection and field reporting - Project manager logbook - Construction collaboration - Quality management - Safety management - Change management

Screenshots

HVAC4 screens
Interaxo Field4 screens

Verdict

The call

The clearest difference is price: Interaxo Field at Free against HVAC's $4.99. Interaxo Field also leads on update cadence (every 3 weeks vs every 5 months) and iOS requirement (14.2 vs 16.0). On 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

CostPrice · In-app purchases · Ads · Monetization

Interaxo Field is free to download; HVAC costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

HVAC ships an update every 5 months, Interaxo Field every 3 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
HVAC versus Interaxo Field: the parameters behind the verdict, then further details
ParameterHVACInteraxo Field
Price$4.99Free — better
Rating4.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 5 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.014.2 — better
Further details — not scored
Size14 MB100 MB
Age rating4+4+
DeveloperTrond RossvollTribia AS

In-app purchases

None

HVAC

No in-app purchases

None

Interaxo Field

No in-app purchases

Questions

Is HVAC free?
HVAC costs $4.99, with no in-app purchases.
Is Interaxo Field free?
Interaxo Field is free to download, with no in-app purchases.
Do HVAC or Interaxo Field have ads?
Neither HVAC nor Interaxo Field shows ads.
Which is updated more often, HVAC or Interaxo Field?
HVAC ships an update every 5 months, and Interaxo Field every 3 weeks. Most recently, HVAC was updated on November 1, 2026 and Interaxo Field on November 3, 2026.

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