# CDL Prep vs CDL HazMat

The clearest difference is update cadence: CDL Prep at daily against CDL HazMat's fortnightly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CDL Prep ships an update daily, CDL HazMat fortnightly. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CDL Prep | CDL HazMat |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Daily** | Fortnightly |
| Size | 407 MB | 24 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [E Turing](https://appshunter.io/developer/1794242065) | [Mert Demir](https://appshunter.io/developer/1864769723) |

## What reviewers say

### CDL Prep

[App page](https://appshunter.io/ios/app/cdl-prep/id6742354881)

**Features:** macOS Compatibility

**In-app purchases:** none


### CDL HazMat

[App page](https://appshunter.io/ios/app/cdl-hazmat-audio-prep-2026/id6758774591)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CDL Prep free?

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

### Is CDL HazMat free?

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

### Do CDL Prep or CDL HazMat have ads?

Both CDL Prep and CDL HazMat show ads.

### Which is updated more often, CDL Prep or CDL HazMat?

CDL Prep ships an update daily, and CDL HazMat fortnightly. Most recently, CDL Prep was updated on October 13, 2026 and CDL HazMat on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*