Apps / CDL Hazmat Prep
CDL Hazmat Prep
SafetyLive on App StoreCDL Hazmat Prep is an iOS app for the CDL hazmat endorsement knowledge test — it includes 1,000+ DOT practice questions covering all 9 hazard classes, placarding rules, and shipping papers, plus a complete UN number placard lookup guide, for $17.99 with lifetime access, no subscription, works offline.
iOS · Free to download · $17.99 one-time unlock
Everything You Need to Pass the CDL Hazmat Endorsement Test
DOT Placard Guide
DOT hazmat placard guide — all 9 hazard classes with threshold quantities and divisions
1,000+ Practice Questions
1,000+ CDL hazmat endorsement questions based on 49 CFR Parts 171–180
Works Offline
Full offline access — works in the truck, terminal, or training center without Wi-Fi
Progress Tracking
Per-topic progress tracking across all CDL hazmat endorsement test categories
What’s on the CDL Hazmat Exam?
Topic weights are approximate. VoltExam’s question bank covers every topic area above.
How It Works
Step 01
Download Free
Free to download on the App Store — unlock everything once for $17.99.
Step 02
Practice Daily
Built-in calculators you'll use on the job — not just quizzes.
Step 03
Pass First Try
$17.99 once. No subscriptions. No recurring fees.
Pricing
VoltExam
$17.99one-time
- ✓ Pay once, use forever
- ✓ No monthly fees
- ✓ Full offline access
- ✓ All updates included
Competitors
$20+/month
- ✕ Subscription required
- ✕ Lose access if you cancel
- ✕ Often requires Wi-Fi
- ✕ $240+ per year
CDL Drivers Who Cleared Hazmat in One Attempt
“Passed the CDL hazmat endorsement with an 88. The placard guide made everything click into place.”
— Steve M., CDL Driver, California
“This was the only app I used to study. TSA cleared and hazmat done in one week of studying.”
— Luis G., CDL Driver, Texas
Frequently Asked Questions
How many questions are on the CDL hazmat endorsement test?
The CDL Hazmat Knowledge Test has 30 questions. You must answer at least 24 correctly (80%) to pass. The test covers hazmat classifications, placarding, shipping papers, and emergency response.
Do I need a TSA background check for the hazmat endorsement?
Yes. Federal law requires all CDL hazmat endorsement applicants to pass a TSA Security Threat Assessment (STA). You submit fingerprints and the TSA reviews your criminal and immigration history. The process takes 2–3 weeks.
How long does a CDL hazmat endorsement last?
CDL hazmat endorsements expire with your CDL, which is typically every 4–5 years depending on your state. You must renew the endorsement and pass the TSA background check at each renewal.
What score do I need to pass the hazmat endorsement test?
You need at least 80% — 24 out of 30 questions correct. VoltExam's hazmat practice tests are calibrated to this standard, with harder questions than the real exam so test day feels easy.
