# CDL Hazmat Exam Prep — Pass H Endorsement — DOT Tools > CDL Hazmat endorsement exam preparation with practice questions and study tools. (iPhone/iPad app by Deeun Inc..) - Source: https://appshunter.io/ios/app/cdl-hazmat-exam-prep/id6758050011 (this page in markdown: same URL + `.md`) - Developer: [Deeun Inc.](https://appshunter.io/developer/1691824695) - Category: Education, Utilities - Price: Free with in-app purchases - Rating: 4.11/5 from 9 App Store ratings - Age rating: 4+ - Requires: iOS 17.0 · 6 MB - Languages: English - Released: 2026-01-20 - Data updated: 2026-07-11 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/cdl-hazmat-exam-prep/id6758050011/reviews.md ## What is CDL Hazmat Exam Prep? CDL HAZMAT PREP: PASS YOUR HAZMAT ENDORSEMENT EXAM FIRST TRY The CDL hazmat endorsement exam covers all 9 hazard classes, placarding rules, loading procedures, and emergency response. You need 80 percent to pass. This app gives you 1,000+ practice questions based directly on 49 CFR Parts 171 through 180 — the same federal regulations FMCSA tests you on. DOT PLACARD GUIDE All 9 hazard classes with divisions, threshold quantities, and special provisions. Class 1 Explosives through Class 9 Miscellaneous with every division, placard color, and UN number format explained. This is the reference material you will use on the exam and on the road. HAZMAT CLASS GUIDE Visual reference for all 9 DOT hazmat classes with color diamonds, divisions, and exam tips. Covers every class and division that appears on the endorsement exam. EXAM SIMULATOR Five exam modes: Hazmat General Knowledge, Hazmat Operations, Emergency Response, Tanker Endorsement, and Full H/N/X Combo. 30 questions, 80 percent pass threshold, timed, with per-category scoring showing exactly where you are strong and where you need work. EMERGENCY RESPONSE GUIDE Based on ERG procedures: incident response steps, CHEMTREC contact (800-424-9300), isolation distances for major hazard classes, fire response protocols, and driver responsibilities at the scene. HAZMAT MATH TOOLS Placard weight threshold calculator, tank capacity and outage calculator, safe following distance calculator, and DOT fine estimator. Real tools you will use after the exam too. FLASHCARD DECKS Hazard Classes, Placarding Rules, Shipping Papers, Loading and Segregation, Emergency Response, and Tanker Operations. Study at the terminal, in the sleeper, or at the truck stop. Works 100 percent offline. No signal needed. SMART PRACTICE The app tracks which categories you are struggling with and serves those questions more often. No wasting time on topics you have already mastered. Every question includes a detailed explanation tied to the specific CFR section so you understand the rule, not just the answer. PASS PROMISE: Complete all questions with 80% or higher average, hold active subscription for 3 months, still do not pass. We extend your access by 4 months at no charge. voltexam.com/pass-promise PRO: Unlimited questions, all exam simulator modes, every flashcard deck, every math tool, full ERG reference, smart practice, Pass Promise coverage. 3-day free trial included. A hazmat endorsement means higher pay per mile. This app costs less than a single fuel stop. Pass your CDL Hazmat endorsement the first time. Privacy Policy: https://www.voltexam.com/privacy Terms of Service: https://www.voltexam.com/terms Apple EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - 1,000+ practice questions - DOT placard guide - Exam simulator with 5 modes - Offline flashcard decks - Smart practice for weak areas - Hazmat math tools - Emergency response guide ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Monthly Access | $9.99 | per month | | Annual Access | $24.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | CDL Hazmat Prep - Lifetime Pro | $49.99 | one-time | ## Frequently asked questions about CDL Hazmat Exam Prep ### What is the pass rate for the CDL Hazmat Exam Prep app? The app is designed to help users pass the Hazmat endorsement exam, which requires an 80 percent score. The app's 'Pass Promise' offers an extension of access if a user meets specific criteria and still doesn't pass. ### Does CDL Hazmat Exam Prep have ads? No, CDL Hazmat Exam Prep does not contain advertisements. The app is free to download and offers a freemium model with optional in-app purchases for full access. ### How does the 'Smart Practice' feature work in CDL Hazmat Exam Prep? The 'Smart Practice' feature tracks the categories you struggle with and serves those questions more frequently. This ensures you focus your study time on areas where you need the most improvement. ### What is the 'Pass Promise' in CDL Hazmat Exam Prep? The 'Pass Promise' is a guarantee that if you complete all questions with an 80% or higher average, hold an active subscription for 3 months, and still do not pass the exam, your access will be extended by 4 months at no charge. ### Can I use CDL Hazmat Exam Prep offline? Yes, the flashcard decks and other study materials in CDL Hazmat Exam Prep work 100 percent offline. No signal is needed, making it convenient for studying anywhere. ### What specific federal regulations does CDL Hazmat Exam Prep cover? The app's practice questions are based directly on 49 CFR Parts 171 through 180, which are the federal regulations used by the FMCSA for testing. ### What are the different exam modes available in CDL Hazmat Exam Prep? The app offers five exam modes: Hazmat General Knowledge, Hazmat Operations, Emergency Response, Tanker Endorsement, and a Full H/N/X Combo. Each mode simulates exam conditions with timed questions and scoring. ### What is the cost of CDL Hazmat Exam Prep? The app is free to download and offers a 3-day free trial for its PRO version. Pricing details for subscriptions can be found within the app. ## Version history (last 5 releases) ### 2.4 — 2026-05-23 Studying for your CDL Hazmat endorsement? We've made it easier to see everything Pro unlocks — and to start your 3-day free trial: • 510+ practice questions mapped to 49 CFR Part 172 • ERG quick lookup for any UN/NA number when you're on the road • Placard Builder + DOT Fine Calculator for real-world use • 30-question timed mock exam in the same format as the DMV test • Smart practice that targets the topics where you're weakest Plus a cleaner upgrade screen with a refreshed shield-and-diamond design so the value is obvious at a glance. Pass the endorsement. Stay compliant on the job. Drive on. ### 2.2 — 2026-05-04 Major update packed with new tools and improvements. New: Hazmat Class Guide with visual color diamonds, divisions, and exam tips for all 9 DOT hazmat classes. New: Speed Round, a 60-second timed drill to sharpen your recall under pressure. New: Annual Plan at $24.99 per year, best value for CDL candidates in training. New: 3-Day Free Trial, try everything Pro free with no commitment. New: Smarter onboarding shows you exactly what is inside before you start. Improved: Cleaner adaptive UI that follows your system light and dark settings. Better Flashcards, ERG Lookup, and Placard Builder, all polished and faster. Questions covering Hazmat, Tanker, and Combination Vehicle. Good luck on your exam. You have got this. ### 2.0 — 2026-03-18 Major Update - 5-tab redesign: Study Hub, Tools Hub, Reference Hub, Progress Hub, Settings - Exam Simulator: 5 timed modes (General, Operations, Emergency, Tanker, Full H/N/X) - 6 flashcard decks — swipe through at the terminal or truck stop - Hazmat math tools: placard weight, tank capacity, following distance, DOT fines - Emergency Response Guide with ERG procedures and CHEMTREC info - DOT Regulations Reference: 49 CFR quick-access - Study streaks, exam countdown, category mastery tracking - VoltExam Pass Promise: study seriously and don't pass? Full refund. ### 1.2 — 2026-03-12 What's New in v1.2 - Placard Builder (Pro) — Zero-error hazmat loading simulator. Practice placing DOT placards correctly before you hit the road. - DOT Fine Calculator (Pro) — Know exactly what violations cost. Real penalty amounts based on federal FMCSA schedules. - Auto Theme — App now matches your phone's appearance automatically. Light mode, dark mode — your choice. - Dynamic Versioning — Always shows the correct version across the app, no manual updates needed. - 1500+ Practice Questions — Covering all H, N, and X endorsement categories with 49 CFR references and detailed explanations. - Bug fixes ### 1.1 — 2026-02-23 What's New: • VoltExam brand refresh complete across all apps • Enhanced placard recognition drill engine • Updated for 2026 FMCSA regulations • Improved dark mode for night study sessions ## More apps by Deeun Inc. - [Kidonomic: Kids Money Coach](https://appshunter.io/ios/app/kidonomic-kids-money-coach/id6476450084) - [AI Stock Vision](https://appshunter.io/ios/app/ai-stock-vision/id6738970800) - [Use-It-Up:Save Food,Save Money](https://appshunter.io/ios/app/use-it-upsave-foodsave-money/id6749287569) - [StyleFlip AI](https://appshunter.io/ios/app/styleflip-ai/id6753980457) - [Steps++ : Track & Challenge](https://appshunter.io/ios/app/steps-plus-plus-track-and-challenge/id6754710872) - [Electrician Exam Prep:NEC 2026](https://appshunter.io/ios/app/electrician-exam-prepnec-2026/id6757658532) All apps by Deeun Inc.: https://appshunter.io/developer/1691824695 ## Related topics [hazmat test prep 2026](https://appshunter.io/ios/topics/hazmat-test-prep-2026) · [best apps for hazmat test preparation](https://appshunter.io/ios/topics/best-apps-for-hazmat-test-preparation) · [free hazmat test 2026](https://appshunter.io/ios/topics/free-hazmat-test-2026) · [free hazmat test](https://appshunter.io/ios/topics/free-hazmat-test) · [cdl hazmat practice test 2026](https://appshunter.io/ios/topics/cdl-hazmat-practice-test-2026) · [dmv hazmat test](https://appshunter.io/ios/topics/dmv-hazmat-test) · [hazmat placard](https://appshunter.io/ios/topics/hazmat-placard) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-11.*