# HVAC Formulator vs Hydronic

The clearest difference is price: Hydronic at Free against HVAC Formulator's $4.99. Hydronic also leads on in-app purchases (none vs 1) and update cadence (weekly vs every 2 months). On ads and device support there is nothing between them.

Hydronic is free to download; HVAC Formulator costs $4.99 up front. HVAC Formulator sells 1 one-off in-app purchase. Hydronic asks for nothing beyond the download.

HVAC Formulator ships an update every 2 months, Hydronic weekly. The most recent releases landed on October 18, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | HVAC Formulator | Hydronic |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 9.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Paid | — |
| Size | 73 MB | 2 MB |
| Requires iOS | 18.6 | **12.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Philip Antecol](https://appshunter.io/developer/1210668842) |

## What reviewers say

### HVAC Formulator

[App page](https://appshunter.io/ios/app/hvac-formulator/id318898907)

This app provides HVAC professionals with over 900 essential formulas and calculations for load calculations and system design. It supports both US and Metric units, offers instant switching, and includes 23 calculator categories and over 460 unit conversions. Designed for field use, it works offline and allows users to save and share results.

**Highlights:** Over 900 formulas and calculations, US & Metric unit support, 23 calculator categories, 460+ unit conversions, 8 temperature scales, Offline functionality, Save and share results

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Pro | $3.99 | one-time |


### Hydronic

[App page](https://appshunter.io/ios/app/hydronic/id1210668843)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Formulator free?

HVAC Formulator costs $4.99, and also offers in-app purchases.

### Is Hydronic free?

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

### Do HVAC Formulator or Hydronic have ads?

Neither HVAC Formulator nor Hydronic shows ads.

### Which is updated more often, HVAC Formulator or Hydronic?

HVAC Formulator ships an update every 2 months, and Hydronic weekly. Most recently, HVAC Formulator was updated on October 18, 2026 and Hydronic on October 6, 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.*