CDL Prep

Name: CDL Prep
Rating: 4.5742574 (5673 reviews)
Author: Jeffrey Diaz

By: Jeffrey Diaz App

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

Overview

Google Play Store

Downloads

1,461,242 ▲ 3.43K

Data as of 2026-08-30

Rating:

4.57 +8

(5,673)

Version:

9.13

Last updated: 2026-08-08

Features & Capabilities

CDL Prep is your ultimate preparation tool for passing the Commercial Driver's License (CDL) General Knowledge exam and various endorsement exams including Air Brakes, Hazmat, Passenger, and more. It features over 500 practice questions covering essential topics such as General Commercial, Combinations, Tanks, School Bus, and Doubles/Triples.

Key features include an Exam Mode with timed tests (60 minutes for 50 questions or 40 minutes for endorsement topics) that allows review of scores and incorrect answers, a Practice Mode providing instant feedback, randomized answer positioning to enhance learning, and detailed performance tracking with color-coded scoring to identify strengths and areas needing improvement. CDL Prep is designed to help you study efficiently and confidently pass your CDL tests.

User Growth & Download Statistics

App Education

By:

Jeffrey Diaz

Downloads:

1,461,242 3.43K

Rating:

4.57

(5,673) 8 new ratings

Version:

9.13 Last updated: 2026-08-08

Version code:

178

Creation date:

2014-06-11

Publisher country:

Permissions:

com.google.android.gms.permission.AD_ID Moderate risk
android.permission.ACCESS_ADSERVICES_AD_ID Low risk
android.permission.ACCESS_ADSERVICES_ATTRIBUTION Low risk
android.permission.ACCESS_ADSERVICES_TOPICS Low risk
android.permission.FOREGROUND_SERVICE Low risk
android.permission.INTERNET Low risk
android.permission.WAKE_LOCK Low risk
com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE Low risk
android.permission.ACCESS_NETWORK_STATE Safe
com.jeffreydiaz.android.app.cdlprep.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Size:

9.34MB

Email:

CD*****@gmail.com

URLs:

Website ,Privacy policy

Full description:

Source:

Google Play Store

Data ingested on:

2026-08-30

Compare stats and ranking:

Ranking

# 54,541 ▼ 60

Other rankings

#132 in Education (Free) ▼ 7

Other platforms

CDL Prep (v9.13)

4.70

(6,784)

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Android app. Please use these information below to contact the Android app developer.

Developed by:

Jeffrey Diaz

Google Play Store

https://play.google.com/store/apps/details?id=com.jeffreydiaz.android.app.cdlprep

Email:

CD*****@gmail.com

Website:

https://www.jeffreydiaz.com/

User Reviews

Users broadly praise CDL Prep for delivering accurate, exam-like questions that align with real CDL tests and endorsements. The app helps many people pass permits, often on the first attempt, and it covers a wide range of topics and state-specific material (notably NY and Minnesota). However, reviewers warn that ads can be intrusive, some topics like Hazmat are missing, and a few questions have duplicates or lack reporting options. There are occasional UX quirks, such as not resuming a mid-test after backing out and a lack of explanations for answers.

Pros

Questions closely mirror real CDL exam content and are highly accurate.
Helps users pass CDL permits and endorsements, often on the first attempt.
Covers a wide range of topics and endorsements (General Knowledge, Air Brakes, Passenger, Tank, etc.).
Useful region-specific prep for state exams (works well for NY and Minnesota).

Cons

Ads and pop-ups can be intrusive and disrupt studying.
Some topics are missing or not fully covered (e.g., Hazmat questions).
Occasional question issues like duplicate answers and no easy way to report errors.
Some UX issues: back button can cause you to lose progress; limited context/explanations for answers.

Recent reviews

I passed all 4 of my cdl b test on the first try because of this app it's good for rote learners (people who learn by repetition) just keep taking the exams over and over and you'll get it!

Cr*****, 2026-08-25

Very good practice for the Air Brakes, Combination Vehicle, and General Knowledge tests, but completely leaves out the Commercial Rules test that is required prior to taking any of these tests at Texas DPS. (Don't forget to study Chapter 14 in your CDL handbook prior to testing in Texas)