# HVAC Formulator vs SnapFull

The clearest difference is price: SnapFull at Free against HVAC Formulator's $4.99. SnapFull also leads on iOS requirement (14.5 vs 18.6). HVAC Formulator's advantage is rating (2.0 vs 1.0) and ads (none vs shown). On ratings volume, in-app purchases and device support there is nothing between them.

SnapFull is free to download; HVAC Formulator costs $4.99 up front. HVAC Formulator sells 1 one-off in-app purchase and SnapFull sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

HVAC Formulator holds the better App Store score, 2.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 9% of HVAC Formulator's written reviews are positive against 0% of SnapFull's.

HVAC Formulator ships an update every 2 months, SnapFull every 16 months. The most recent releases landed on October 6, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | HVAC Formulator | SnapFull |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/snapfull/id1588012164/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | **9.1% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 16 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 73 MB | 6 MB |
| Requires iOS | 18.6 | **14.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Toshitaka Agata](https://appshunter.io/developer/792412045) |

## 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 |


### SnapFull

[App page](https://appshunter.io/ios/app/snapfull/id1588012164)

Capture full-size screenshots of web pages with ease. Utilize the sharing action menu for quick captures. Customize the display by choosing to show or hide ad banners and watermarks.

**Highlights:** Fullscreen web page screenshots, Action menu integration, Ad banner toggle, Watermark toggle

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide ads, Hide watermarks | $3.99 | one-time |


## Frequently asked questions

### Is HVAC Formulator free?

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

### Is SnapFull free?

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

### Which has better reviews, HVAC Formulator or SnapFull?

HVAC Formulator is rated higher. HVAC Formulator averages 2.0 out of 5 from 1 ratings, while SnapFull averages 1.0 from 1 ratings.

### Do HVAC Formulator or SnapFull have ads?

SnapFull shows ads; HVAC Formulator does not.

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

HVAC Formulator ships an update every 2 months, and SnapFull every 16 months. Most recently, HVAC Formulator was updated on October 6, 2026 and SnapFull on September 28, 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.*