# HVAC vs FastXY

The clearest difference is price: FastXY at Free against HVAC's $4.99. FastXY also leads on rating (5.0 vs 4.0) and update cadence (every 2 months vs every 5 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

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

FastXY holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

HVAC ships an update every 5 months, FastXY every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | HVAC | FastXY |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/hvac-calculator/id602391404/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/fastxy/id1637519441/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 14 MB | 114 MB |
| Requires iOS | 16.0 | **15.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Trond Rossvoll](https://appshunter.io/developer/571419518) | [Discovery Management Group](https://appshunter.io/developer/1349983968) |

## What reviewers say

### HVAC

[App page](https://appshunter.io/ios/app/hvac-calculator/id602391404)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### FastXY

[App page](https://appshunter.io/ios/app/fastxy/id1637519441)

This app enables high-accuracy GNSS data collection for professional surveying and GIS applications. It supports various data types, stake-out functions, and offline use, with multiple export options for seamless integration with other software.

**Highlights:** High-accuracy GNSS data collection, Point, line, and polygon data capture, Submeter or centimeter (RTK) accuracy, Stake-out feature, Offline data collection, Multiple export formats (CSV, shp, DXF/DWG), Feature/attribute/value pick lists

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is HVAC free?

HVAC costs $4.99, with no in-app purchases.

### Is FastXY free?

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

### Which has better reviews, HVAC or FastXY?

FastXY is rated higher. HVAC averages 4.0 out of 5 from 1 ratings, while FastXY averages 5.0 from 3 ratings.

### Do HVAC or FastXY have ads?

Neither HVAC nor FastXY shows ads.

### Which is updated more often, HVAC or FastXY?

HVAC ships an update every 5 months, and FastXY every 2 months. Most recently, HVAC was updated on November 1, 2026 and FastXY on November 3, 2026.

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