# AirPro vs EngiCalc

The clearest difference is in-app purchases: EngiCalc at none against AirPro's 2. EngiCalc also leads on ads (none vs shown). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. AirPro sells 2 in-app purchases, starting at $7.99 per month. EngiCalc asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for AirPro against 5.0 for EngiCalc. Both are backed by a comparable volume of ratings — 5 and 2 respectively.

AirPro ships an update every 4 days, EngiCalc every 3 days. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | AirPro | EngiCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (5 ratings)](https://appshunter.io/ios/app/airpro-btu-calculator/id6470185437/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/engicalc/id6742305878/reviews) |
| Number of ratings | **5** | 2 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 days | **Every 3 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 18 MB | 96 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Igor Ilijovski](https://appshunter.io/developer/1492982127) | [Joshua Williams](https://appshunter.io/developer/1797613871) |

## What reviewers say

### AirPro

[App page](https://appshunter.io/ios/app/airpro-btu-calculator/id6470185437)

This tool helps you calculate the right size for air conditioners, heat pumps, and furnaces. It provides detailed analysis of heating and cooling costs, energy consumption, and temperature data. You can also evaluate domestic hot water needs and financial aspects like payback periods.

**Highlights:** BTU estimation for HVAC systems, Monthly heating and cooling cost calculation, Energy consumption and temperature analysis, Domestic hot water needs evaluation, Financial analysis including payback periods, Data export to CSV and PDF reports

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AirPro Premium - Monthly | $7.99 | per month |
| AirPro Premium - Annual | $29.99 | per year |


### EngiCalc

[App page](https://appshunter.io/ios/app/engicalc/id6742305878)

This app provides specialized calculation tools for construction professionals. It helps optimize material usage, estimate quantities, and generate precise dimensions for various building elements like concrete pours, masonry, stairs, rafters, and roofing.

**Highlights:** Concrete material optimization, Masonry quantity estimation, Effortless stair dimension generation, Rafter length and angle calculation, Roofing material estimation

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is AirPro free?

AirPro is free to download, with in-app purchases available.

### Is EngiCalc free?

EngiCalc is free to download, with no in-app purchases.

### Which has better reviews, AirPro or EngiCalc?

AirPro and EngiCalc are both rated 5.0 out of 5 on the App Store, from 5 and 2 ratings respectively.

### Do AirPro or EngiCalc have ads?

AirPro shows ads; EngiCalc does not.

### Which is updated more often, AirPro or EngiCalc?

AirPro ships an update every 4 days, and EngiCalc every 3 days. Most recently, AirPro was updated on October 24, 2026 and EngiCalc on October 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*