CDL Prep

9.11.1

Jeffrey Diaz

4.61

5,319 reviews

1,000,000+
Downloads

Free

Pass your state General Knowledge CDL exam with the help of CDL Prep.

About CDL Prep

CDL Prep is an education app developed by Jeffrey Diaz.

Download Statistics

CDL Prep has been downloaded 1.4 million times. In the last 30 days, the app was downloaded 12 thousand times. It is ranked in the top 100 education apps.

User Ratings

CDL Prep is rated 4.61 out of 5 stars. The rating is based on 5.3 thousand ratings.

App Information

CDL Prep is FREE to download. The APK download size is 9.34 MB. The latest version available is 9.11.1. The last update was on May 17, 2026.

Technical Requirements

CDL Prep requires Android 6.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play June 2014.

Description

CDL Prep is the best way to prepare for the Commercial Drivers License General Knowledge, and various endorsement exams. CDL Prep contains questions on the following topics: General Commercial, Air Brakes, Combinations, Hazmat, Passenger, Tanks, School Bus, and Doubles/Triples.

Features:
1. Over 500 questions to practice with.

2. Exam Mode - 60 minutes to answer 50 randomly chosen questions, or 40 minutes to answer 20 to 30 questions on endorsement topics. At the end, review your score and any incorrect answers.

3. Practice Mode - Answer questions and receive instant feedback if you answered incorrectly.

4. Answer Randomization - Answers to questions will not always be in the same position.

5. Performance tracking - Review your performance on every question. Red = You have an average score less than 70%, Orange = You have an average score between 70-89%, Green = You have an average score of 90% and above.

Please send any feedback or request to: CDLPrepApp@gmail.com. Thank you and good luck on your exams!

Recent changes:
Minor bug fixes and performance improvements

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More data about CDL Prep

Price	Free to download
Total downloads	1.4 million
Recent downloads	12 thousand
Rating	4.61 based on 5.3 thousand ratings
Ranking	Highly ranked
Version	9.11.1
APK size	9.34 MB
Number of libraries	16
Designed for Android	6.0+
Suitable for	Everyone
Ads	Contains ads

App Performance Report

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Alternative downloads for the CDL Prep app

CDL Prep compared with similar apps

Google Play Rating history and histogram

4.5K

330

110

300

Downloads over time

CDL Prep has been downloaded 1.4 million times. Over the past 30 days, it averaged 400 downloads per day.

Changelog of CDL Prep

May 17, 2026UpdateVersion 9.11.1
Feb 13, 2026UpdateVersion 9.10
Jan 1, 2026UpdateVersion 9.9
Nov 7, 2025UpdateVersion 9.8.1
Sep 19, 2025UpdateVersion 9.8
Jun 26, 2025UpdateVersion 9.7
May 30, 2025UpdateVersion 9.6
Apr 4, 2025UpdateVersion 9.5.3
Jan 12, 2025UpdateVersion 9.5.1
Jan 11, 2025UpdateVersion 9.5
Nov 15, 2024UpdateVersion 9.4.1
Sep 6, 2024UpdateVersion 9.4
Aug 9, 2024UpdateVersion 9.3
Apr 29, 2024UpdateVersion 9.2.1
Apr 17, 2024UpdateVersion 9.2
Mar 3, 2024Installs1,000,000+ installs
Jan 5, 2024UpdateVersion 8.8
Aug 25, 2023UpdateVersion 8.7.5
Jun 9, 2023UpdateVersion 8.7.3
May 12, 2023UpdateVersion 8.7.2
Mar 25, 2023UpdateVersion 8.7
Jan 9, 2023UpdateVersion 8.5.1
Sep 23, 2022UpdateVersion 8.4
Sep 10, 2022UpdateVersion 8.3.3
May 14, 2022UpdateVersion 8.3.2
Feb 11, 2022UpdateVersion 8.3.1
Jan 4, 2022UpdateVersion 8.3
May 5, 2021UpdateVersion 8.0
Feb 13, 2021Installs500,000+ installs
Sep 7, 2020UpdateVersion 7.5
Aug 5, 2020UpdateVersion 7.4
Jun 24, 2020UpdateVersion 7.3
Apr 26, 2020UpdateVersion 7.1
Feb 11, 2020UpdateVersion 6.2
Jan 13, 2020UpdateVersion 6.1
Sep 27, 2019UpdateVersion 6.0.1
Aug 1, 2019UpdateVersion 5.9
Jun 16, 2019UpdateVersion 5.8
Jun 1, 2019UpdateVersion 5.7.4
May 9, 2019UpdateVersion 5.7.3
Apr 1, 2019UpdateVersion 5.7
Mar 6, 2019UpdateVersion 5.6.5
Mar 3, 2019UpdateVersion 5.6.3
Feb 18, 2019UpdateVersion 5.6.1
Jan 6, 2019UpdateVersion 5.5
Nov 14, 2018UpdateVersion 5.4.4
Sep 18, 2018UpdateVersion 5.4.3
Sep 7, 2018UpdateVersion 5.4.1
Aug 17, 2018UpdateVersion 5.4
Aug 9, 2018UpdateVersion 5.3

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Developer information for Jeffrey Diaz

Jeffrey Diaz

CDLPrepApp@gmail.com

Website

N/A

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Comments on CDL Prep for Android

★★★★★ Lares Matos · May 8, 2026

Best app for cdl permit all the questions you see in this app they come out on test only very few there were not. Pass with a 100% general knowledge, combinations,air breaks thanks for being so accurate with the questions.there are alot of apps that the questions they give you don't come out on the test will recommend this app to everyone. Thank you guys for provide me we such a great tool.👍🎉 I recently relocated to another state, and I had to retake the Hazmat endorsement pass with 100% best app

★★★★★ Sim Pete · Feb 27, 2026

Passed ny exam is the best I recommended it for anyone fof the cdl test I practice those questions 239 for several time I passed today general knowledge only for today

★★★★★ Ben Coleman · Mar 6, 2026

I used this app to prep for T and N endorsements and alot of the questions were the same and I passed first try👍

★☆☆☆☆ Roger Rodrz. · Feb 4, 2026

Trash... you gave me a test that when I went over there seven of the questions were there and the other ones were not, it doesn't give you the full test this is trash.

★☆☆☆☆ Harmonious Joe · Jan 29, 2026

App developer needs to better scrutinize what types of ads they allow on their service. I've seen at least 3 or 4 scam adds that present themselves as if they were notifications and each is making some sort of statement that would likely be mistaken for an OS/system message. Be advised, these are likely malicious and could compromise your devices' security.

★★☆☆☆ Martin C · Feb 26, 2026

Does the job of preparing you for exams. Memorizing. My gripe is you never retain any information with this app. There's no context. Boom you're talking about draining air from tanks. Im new. I don't even know how many tanks there are in a truck much less know which specific one its talking about. Water and oil in tanks? Draining the air from the same tank? What is this app? There's no button to get context either. The only workaround is to get the answer wrong on purpose, so you can see why

Google Play Rankings for CDL Prep

Top rankings

Rank	Country	Category	List
99	United States	Education	Top Free

Show all market rankings

Ranking history in United States

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Technologies used by CDL Prep

CDL Prep is requesting 10 permissions and is using 17 libraries.

Permissions

Network communication

view network connections, full network access

System tools

prevent phone from sleeping

Extra

android.permission.ACCESS_ADSERVICES_AD_ID, android.permission.ACCESS_ADSERVICES_ATTRIBUTION, android.permission.ACCESS_ADSERVICES_TOPICS, android.permission.FOREGROUND_SERVICE, com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE, com.google.android.gms.permission.AD_ID, com.jeffreydiaz.android.app.cdlprep.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Ad network libraries

AdMob

Social libraries

None found

Development tools

Android Jetpack core

Android Architecture Components

Android Jetpack VersionedParcelable Firebase Android Library Icon

Firebase

Android Jetpack Annotations Android Jetpack Widgets Android Library Icon

Android Jetpack Widgets Android Jetpack AppCompat Android Library Icon

Android Jetpack AppCompat AndroidX App Startup Android Library Icon

AndroidX App Startup Android WorkManager Android Library Icon

Android WorkManager AndroidX Emoji / Emoji2 Android Library Icon

AndroidX Emoji / Emoji2 AndroidX ProfileInstaller Android Library Icon

AndroidX ProfileInstaller Chromium Android Library Icon

Chromium

AndroidX WebKit AndroidX Preference Android Library Icon

AndroidX Preference Jetpack DataStore Android Library Icon

Jetpack DataStore

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