CDL Prep HeroFree to start · iPhone and Android
Learn the why. Then practice.
CDL Prep Hero brings short lessons, visual explanations and practice questions together on your phone. Study for US commercial driver knowledge tests, one subject at a time.
Screenshots
Read. Listen. Explain it back.
Lessons use plain language, diagrams and read-aloud to explain the ideas behind an answer. Practice questions include explanations, so a missed answer gives you a topic to revisit—not just a lower score.
Choose your state, license class and endorsements to organize a study plan. Review missed answers, save questions for later, and take mock exams for your study subjects.
Subjects in the app
General Knowledge, Air Brakes, Combination Vehicles, HazMat, Tank Vehicles, Doubles/Triples, Passenger, School Bus.
Your selections help organize study material; they are not a licensing determination or a claim that every state’s manual is fully covered. Check your current official manual for what applies to you.
Start free. Choose full access later.
| Access | Included | Price and duration |
|---|---|---|
| Free starter access | Starter lessons, introductory subject lessons for your plan, and a ten-question General Knowledge sample. No account needed to try them. | $0 |
| Full access | All available lessons, practice, review and mock exams in the app. | $8.99 US for 90 days. No automatic renewal. |
Prices outside the US and any taxes are shown in the store before you buy. No payment is collected on this website.
Purchases, restore and your progress
Sign in with Apple on iPhone or Google on Android before purchasing or restoring paid access. An internet connection is needed for account and purchase verification. Restoring keeps the original expiration; it does not restart the 90 days.
Study progress and saved questions stay on your device and do not sync between phones.
A study aid—not a license or certificate.
Comparing practice apps before you download? See what CDL Prep Hero includes, plus other CDL apps listed by name and seller.
CDL Prep Hero is independent and is not affiliated with a DMV, FMCSA or the US Department of Transportation. It does not provide official exam questions, issue licenses, certify ELDT completion, replace required training, or guarantee a passing result. Practice scores help you gauge your progress and identify weak areas, but they do not predict official test results. Do not use the app while driving. Learn more about our service.
Product information updated .
Start free today.
Download CDL Prep Hero and try the starter lessons. No account needed until you buy full access.