# HVAC Know It All vs CDL Prep Ultimate

The clearest difference is update cadence: CDL Prep Ultimate at weekly against HVAC Know It All's every 6 months. CDL Prep Ultimate also leads on device support (3 vs 1) and iOS requirement (13.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. HVAC Know It All sells 2 in-app purchases, starting at $0.99 per month and CDL Prep Ultimate sells 3 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

HVAC Know It All ships an update every 6 months, CDL Prep Ultimate weekly. The most recent releases landed on September 17, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | HVAC Know It All | CDL Prep Ultimate |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (221 ratings)](https://appshunter.io/ios/app/hvac-know-it-all/id1548260016/reviews)** | — |
| Number of ratings | **221** | — |
| Positive reviews | 83.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | Subscription | — |
| Size | 67 MB | 26 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [HVAC Know It All Inc.](https://appshunter.io/developer/1548260018) | [Orcun GOKGOZ](https://appshunter.io/developer/1876008782) |

## What reviewers say

### HVAC Know It All

[App page](https://appshunter.io/ios/app/hvac-know-it-all/id1548260016)

Connect with HVAC/R professionals to enhance your skills through educational discussions. This app aims to help technicians, installers, owners, educators, and students improve their expertise in the trade.

**Highlights:** Educational discussions, Professional networking, Skill enhancement, Trade knowledge sharing, Technician resources

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.99 | per month |
| Yearly Subscription | $9.99 | per year |

**What reviewers like**

- 👍 Excellent community for tradespeople
- 💡 Vast knowledge sharing among professionals
- 🚀 Game-changer for HVAC technicians
- 🤝 Supportive and non-judgmental environment
- 📚 Great resource for learning and growth

**What reviewers complain about**

- 💰 Forced to pay before accessing content
- 🤔 Subscription fee not clearly stated upfront
- 🚫 App makes you pay before you can test it
- 📉 Limited content in residential group
- ❓ Suspect 5-star reviews, potentially fake

**Requested features**

- More content for the residential group


### CDL Prep Ultimate

[App page](https://appshunter.io/ios/app/cdl-prep-ultimate/id6758960653)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CDL Premium Weekly | $6.99 | per 7 days |
| CDL Premium Monthly | $19.99 | per month |
| CDL Premium Yearly | $39.99 | per year |


## Frequently asked questions

### Is HVAC Know It All free?

HVAC Know It All is free to download, with in-app purchases available.

### Is CDL Prep Ultimate free?

CDL Prep Ultimate is free to download, with in-app purchases available.

### Do HVAC Know It All or CDL Prep Ultimate have ads?

Neither HVAC Know It All nor CDL Prep Ultimate shows ads.

### Which is updated more often, HVAC Know It All or CDL Prep Ultimate?

HVAC Know It All ships an update every 6 months, and CDL Prep Ultimate weekly. Most recently, HVAC Know It All was updated on September 17, 2026 and CDL Prep Ultimate on September 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.*