# Hongtool vs BaseCalc HVAC Calculator

The clearest difference is in-app purchases: Hongtool at none against BaseCalc HVAC Calculator's 2. Hongtool also leads on iOS requirement (9.0 vs 16.4). BaseCalc HVAC Calculator's advantage is update cadence (every 2 months vs every 11 months). On price, ads and device support there is nothing between them.

Both are free to download. BaseCalc HVAC Calculator sells 2 in-app purchases, starting at $7.00 per month. Hongtool asks for nothing beyond the download.

Hongtool ships an update every 11 months, BaseCalc HVAC Calculator every 2 months. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Hongtool | BaseCalc HVAC Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/basecalc-hvac-calculator/id6786116451/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 2 months** |
| Monetization | — | Freemium |
| Size | 154 MB | 61 MB |
| Requires iOS | **9.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [海淑 金](https://appshunter.io/developer/1733572260) | [BASEMAPPED LLC](https://appshunter.io/developer/1896354976) |

## What reviewers say

### Hongtool

[App page](https://appshunter.io/ios/app/hongtool/id6497873827)

**Features:** macOS Compatibility

**In-app purchases:** none


### BaseCalc HVAC Calculator

[App page](https://appshunter.io/ios/app/basecalc-hvac-calculator/id6786116451)

This professional tool offers 18 HVAC calculators for field use, including BTU, CFM, duct sizing, and psychrometrics. It saves calculation history, job records, and allows PDF export of worksheets. The app works offline and features a high-contrast interface for job sites.

**Highlights:** 18 HVAC calculators, BTU/CFM/Duct sizing, Psychrometric calculations, Refrigerant checks, Job records and worksheets, PDF export, Offline functionality

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Pro Monthly | $7.00 | per month |
| HVAC Pro Yearly | $50.00 | per year |


## Frequently asked questions

### Is Hongtool free?

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

### Is BaseCalc HVAC Calculator free?

BaseCalc HVAC Calculator is free to download, with in-app purchases available.

### Do Hongtool or BaseCalc HVAC Calculator have ads?

Neither Hongtool nor BaseCalc HVAC Calculator shows ads.

### Which is updated more often, Hongtool or BaseCalc HVAC Calculator?

Hongtool ships an update every 11 months, and BaseCalc HVAC Calculator every 2 months. Most recently, Hongtool was updated on November 4, 2026 and BaseCalc HVAC Calculator on October 31, 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.*