CDL Prep

CDL Prep
CDL Prep
Developer: Jeffrey Diaz
Add to Compare
1.4M installs
5.6K ratings
12.2K monthly active users
$<10K monthly revenue est.
IAP 0% · Ad 100%
Install Trends
Weekly +2.6K
Declining
Monthly +9.4K
Declining

CDL Prep Summary

CDL Prep is a ad-supported Android app in Education by Jeffrey Diaz. Released in Jun 2014 (12 years ago). It has about 1.4M+ installs and 5.6K ratings with a 4.88★ (excellent) average. Based on AppGoblin estimates, it reaches roughly 12.2K monthly active users and generates around $<10K monthly revenue (0% IAP / 100% ads). Store last updated Jun 20, 2026

Recent activity: 2.6K installs this week (9.4K over 4 weeks) showing declining growth , and 9.00 new ratings this week View trends →

SDK intelligence: AppGoblin detected 1 analytics: product(e.g. Firebase), 1 ad networks, 1 mediation,and 1 development tools integrated into CDL Prep. View full SDK list →

CDL Prep SDKs Summary

CDL Prep was last scanned for SDKs on 2026-07-05. Below is the overview of third-party companies detected in the app. The full list of SDKs, permissions and unknowns is available here.

AppGoblin saw CDL Prep uses 1 Analytics: Product

company-logos/firebase.google.com/logo_200x200.png Firebase

AppGoblin saw CDL Prep uses 1 Ad Networks

company-logos/google.com/logo_200x200.jpeg Google

AppGoblin saw CDL Prep uses 1 Mediation

company-logos/admob.com/logo_200x200.jpeg AdMob

AppGoblin saw CDL Prep uses 1 Development Tools

company-logos/google.com/logo_200x200.jpeg Google

App Details

Store ID: com.jeffreydiaz.android.app.cdlprep
First Released: 2014-06-11
Store Last Updated: 2026-06-20
App Store Category: Education
In-App Purchases: No
Ads: Yes
Website: jeffreydiaz.com

App Store

Crawl Status: Success
AppGoblin First Crawled: 2021-02-06
AppGoblin Last Crawled: 2026-07-14

Ads & App-Ads.txt

Ads.txt Last Crawled: 2025-10-12
Ads.txt Crawl Status: Success

4.88★

Ratings: 5.6K

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Screenshots

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App Description

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

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!