# HVAC Toolkit Ultimate vs cFormula

The clearest difference is price: cFormula at Free against HVAC Toolkit Ultimate's $59.99. HVAC Toolkit Ultimate's advantage is in-app purchases (none vs 1) and ads (none vs shown). On update cadence, device support and iOS requirement there is nothing between them.

cFormula is free to download; HVAC Toolkit Ultimate costs $59.99 up front. cFormula sells 1 one-off in-app purchase. HVAC Toolkit Ultimate asks for nothing beyond the download.

HVAC Toolkit Ultimate ships an update every 6 months, cFormula every 5 months. The most recent releases landed on September 26, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | HVAC Toolkit Ultimate | cFormula |
| --- | --- | --- |
| Price | $59.99 | **Free** |
| Rating | **[3.0 (4 ratings)](https://appshunter.io/ios/app/hvac-toolkit-ultimate/id391408247/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 5 months** |
| Monetization | Paid | — |
| Size | 59 MB | 13 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [疆 边](https://appshunter.io/developer/1124320934) |

## What reviewers say

### HVAC Toolkit Ultimate

[App page](https://appshunter.io/ios/app/hvac-toolkit-ultimate/id391408247)

This comprehensive application offers a suite of tools for HVAC professionals, including load calculations, equipment tracking, refrigerant charts, duct and pipe sizing, and psychrometric analysis. It consolidates multiple functionalities into a single, powerful utility for field and office use.

**Highlights:** Residential load calculations, Equipment nameplate data tracking, Refrigerant pressure-temperature charts, Superheat and subcool calculations, Duct and pipe sizing analysis, Psychrometric calculations, Steam table property calculations

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

**In-app purchases:** none


### cFormula

[App page](https://appshunter.io/ios/app/cformula/id6475750528)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fully unlock app | $1.99 | one-time |


## Frequently asked questions

### Is HVAC Toolkit Ultimate free?

HVAC Toolkit Ultimate costs $59.99, with no in-app purchases.

### Is cFormula free?

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

### Do HVAC Toolkit Ultimate or cFormula have ads?

cFormula shows ads; HVAC Toolkit Ultimate does not.

### Which is updated more often, HVAC Toolkit Ultimate or cFormula?

HVAC Toolkit Ultimate ships an update every 6 months, and cFormula every 5 months. Most recently, HVAC Toolkit Ultimate was updated on September 26, 2026 and cFormula on October 10, 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.*