# HVAC Formulator vs Wisey

The clearest difference is price: Wisey at Free against HVAC Formulator's $4.99. Wisey also leads on rating (3.4 vs 2.0) and ratings volume (260 vs 1). HVAC Formulator's advantage is ads (none vs shown) and update cadence (every 2 months vs every 14 months). On review sentiment, in-app purchases and device support there is nothing between them.

Wisey is free to download; HVAC Formulator costs $4.99 up front. HVAC Formulator sells 1 one-off in-app purchase and Wisey sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

Wisey holds the better App Store score, 3.4 against 2.0. That said, the two scores are not equally well evidenced: Wisey has 260 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 9% of HVAC Formulator's written reviews are positive against 12% of Wisey's.

HVAC Formulator ships an update every 2 months, Wisey every 14 months. The most recent releases landed on October 31, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | HVAC Formulator | Wisey |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/hvac-formulator/id318898907/reviews) | **[3.4 (260 ratings)](https://appshunter.io/ios/app/wisey-habit-builder/id6742659386/reviews)** |
| Number of ratings | 1 | **260** |
| Positive reviews | 9.1% of reviews | **11.8% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 14 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 73 MB | 60 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [KOFLIMIN LIMITED](https://appshunter.io/developer/1621709984) |

## 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 |


### Wisey

[App page](https://appshunter.io/ios/app/wisey-habit-builder/id6742659386)

This app helps you build positive habits and break negative ones. It offers preset templates, full customization for your habits, smart reminders, progress tracking with stats, and home screen widgets for quick access. Start small and stay consistent to build the life you want.

**Highlights:** Preset habit templates, Full habit customization, Smart reminders, Progress tracking with stats, Home screen widgets

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $6.99 | per month |
| Premium | $29.99 | per year |

**What reviewers complain about**

- 🚫 Misleading and deceptive organization
- 💰 Charges without notification and hidden fees
- 🔒 Difficult to cancel subscription
- 🚫 Promised customized plan not provided
- 🚫 Useless app and content


## Frequently asked questions

### Is HVAC Formulator free?

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

### Is Wisey free?

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

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

Wisey is rated higher. HVAC Formulator averages 2.0 out of 5 from 1 ratings, while Wisey averages 3.4 from 260 ratings.

### Do HVAC Formulator or Wisey have ads?

Wisey shows ads; HVAC Formulator does not.

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

HVAC Formulator ships an update every 2 months, and Wisey every 14 months. Most recently, HVAC Formulator was updated on October 31, 2026 and Wisey on October 30, 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.*