Trade Exam Prep
That Actually Works
We build code-compliant professional tools — voltage drop calculators, DOT placard builders, load charts — that tradespeople use to pass their exam and keep on the job. Start free. Plans from $19.99.
Free to try · $19.99/mo · $49.99/yr · $99.99 lifetime · No subscription required
33
Exam prep apps
32,050+
Practice questions
4.8 ★
App Store rating
$99.99
One-time, no sub
NCCCO Crane Operator Certification
Crane Operator Exam Prep
1,000+ practice questions covering load charts, rigging, OSHA 1926 Subpart CC, and hand signals. Built-in load-to-capacity ratio calculator. Only 55% of candidates pass on the first try — our users beat that.
Our Difference
Not just quizzes.
Professional utility tools.
Every VoltExam app ships with a proprietary, code-compliant tool that real professionals use on the job. Not to study. On actual job sites, on trucks, in the field.
The exam questions are there to get you licensed. The tools are there because you'll keep using them long after the exam is over.
Other apps
- ✕ Quiz banks only
- ✕ No on-job utility
- ✕ Subscription lock-in
- ✕ Generic content
VoltExam
- ✓ Built-in pro tools
- ✓ Daily job use
- ✓ One-time purchase
- ✓ Code-accurate content
Electrician
Voltage Drop Calculator
CDL Hazmat
DOT Placard Builder
Crane Op.
Load Chart Calculator
HVAC
Refrigerant Charge Calc
EMT
GCS & Burn Calculator
Plumber
Pipe Sizing Tool
Simple process
How It Works
Step 01
Pick Your Trade
Choose from 33 specialized apps built for your exact certification — electrician, HVAC, EMT, crane, and more.
Step 02
Use Real Tools
Built-in calculators — voltage drop, pipe sizing, load charts — tools you'll actually use on the job, not just for studying.
Step 03
Pass First Try
Plans from $19.99/mo — or grab the $99.99 lifetime deal. No lock-in. Cancel anytime.
All Exam Prep Apps
33 apps · 32,050+ practice questions total
Try it now — no download needed
The Tools You'll Actually Use
This is a live preview of two tools from our CDL Hazmat app. The full app has 1,000+ practice questions, the complete placard system, and all 9 hazmat class segregation rules.
Select a violation above
See the exact fine and prevention steps
Data sourced from FMCSA and 49 CFR. Fine amounts reflect maximum civil penalties — actual fines vary by circumstance. Full CDL Hazmat Exam Prep →
Pricing
Pay Once. Keep Forever.
Competitors charge $60–$180 a year and cut you off when you cancel. VoltExam is $99.99 once — all updates included.
VoltExam
$99.99/one-time
- ✓Pay once, keep forever
- ✓Full offline access
- ✓All updates included
- ✓No account required
Pocket Prep
$60/per year
- ✕Subscription required
- ✕Lose access if cancelled
- ✕Needs internet
- ✕Separate app per exam
Dearborn
$120/per year
- ✕Subscription required
- ✕Real estate only
- ✕Needs internet
- ✕Monthly billing
Reviews
Trusted by Tradespeople
“Passed my CDL Hazmat on the first try. The placard guide alone was worth the price.”
Steve R.
CDL Driver · TX
“I use the voltage drop calculator on every job. The exam questions were a bonus.”
Marcus B.
Journeyman Electrician · FL
“Way cheaper than Pocket Prep and the questions were just as good.”
Christine T.
Real Estate Agent · CA
“Studied for 2 weeks with this app and passed my NCCCO. Worth every penny.”
James H.
Crane Operator · OH
“Finally an app that doesn't charge monthly. One price, done.”
Aaron W.
Journeyman Plumber · GA
“Cleared EPA 608 Universal on my first attempt. The refrigerant charge calculator is still on my phone.”
Derek M.
HVAC Technician · NC
Exam Prep Guides
Free Resource
Not ready to download yet? Start here.
Free resource
Get the Free Cheat Sheet
The top 20 most-tested facts for your exam — in one page. No fluff. Delivered to your inbox instantly. Trusted by tradespeople across the US.
Don’t see your trade?
Tell us what certification you’re studying for and we’ll notify you when we launch a new app.