CDL Prep

CDL Prep
CDL Prep
Developer: Jeffrey Diaz
Category: Education
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1.3M installs
5.5K ratings
10.6K monthly active users
$<10K monthly revenue est.
IAP 0% · Ad 100%
Install Trends
Weekly +3.2K
Steady
Monthly +10.3K
Steady

CDL Prep Summary

CDL Prep is a ad-supported Android app in Education by Jeffrey Diaz. Released in Jun 2014 (11 years ago). It has about 1.3M+ installs and 5.5K ratings with a 4.87★ (excellent) average. Based on AppGoblin estimates, it reaches roughly 10.6K monthly active users and generates around $<10K monthly revenue (0% IAP / 100% ads). Store metadata: updated Feb 14, 2026, version 170.

Recent activity: 3.2K installs this week (10.3K over 4 weeks) showing steady growth , and 11 new ratings this week View trends →

Data tracking: SDKs and third-party integrations were last analyzed on Mar 1, 2026. The app's network data flows (API traffic to/from the app and its SDKs) were last crawled on Dec 18, 2025.

Store info: Last updated on Google Play on Feb 14, 2026 (version 170).

SDKs, Trackers & Permissions

CDL Prep was last scanned for SDKs 2026-03-01. Below is the overview of third party companies detected in the app. The full list of raw SDKs, app permissions and unknown SDKs 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: 2026-02-14
In-App Purchases: No
Ads: Yes
Website: jeffreydiaz.com
App Store
Crawl Status: Success
AppGoblin First Crawled: 2021-02-06
AppGoblin Last Crawled: 2026-03-12
Ads & App-Ads.txt
Ads.txt Last Crawled: 2025-10-12
Ads.txt Crawl Status: Success
AppGoblin SDK Scans
Successful Last Crawled: 2026-03-01
Last Crawled: 2026-03-01
Last Crawl Status: Success

4.87★

Ratings: 5.5K

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Screenshots

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App screenshot
App screenshot
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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!