CDL Exam Prep

KOYDO LLC

In-app purchases

About this app

Koydo CDL is a complete study companion for the Commercial Driver's License knowledge exams -- built for real test-takers, not gimmicks.

WHAT'S INSIDE
- All core CDL knowledge sections, broken down topic by topic
- Full-length mock exams that mirror the real DMV test format
- Section-by-section practice tests with instant explanations
- Flashcards covering CDL Essentials, Handbook Summary, State Testing Tips, and common traps
- Audio study mode -- listen to questions and explanations hands-free, at your own pace
- An ELDT Theory Study Companion mapped to 49 CFR Part 380 for entry-level driver training topics (a study guide only -- not an FMCSA-certified training program)
- Progress tracking so you always know which sections need more work
- A short placement quiz to point you toward your weakest areas first

BUILT FOR HOW YOU ACTUALLY STUDY
Whether you're prepping in the cab between routes, at home before a test date, or reviewing hands-free while you drive, Koydo CDL adapts to your schedule.

SUBSCRIPTION
Koydo CDL Premium unlocks full access to every section, practice test, and study tool. Monthly, 6-month, and annual plans are available; Google Play handles all billing. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period, and can be managed in your Google Play account settings.

Koydo CDL is an independent study tool and is not affiliated with, endorsed by, or certified by the FMCSA or any state DMV.

What’s new

Reliability improvements for subscriptions and purchases, plus performance and stability fixes for a smoother study experience.

Good luck on your CDL exam!