Software for the trades, built so people pass.
Deeun builds VoltExam — the first mobile exam prep tagged to the exact code section, with explanations grounded in the actual jurisdictional code book. 42 licensed trades and certifications, in your pocket.
So the people who keep the lights on, the water flowing, and the buildings standing earn faster.
For 50 years, tradespeople studied from photocopied PDFs.
Heavy code books. Outdated study guides. Static practice tests with no feedback. The same materials, semester after semester.
First-time test takers fail. That's another exam fee. Another wait period. Another month before they can earn a journeyperson wage.
A precision instrument, at scale.
A modern study companion, tuned to the code.
VoltExam serves real exam questions tagged to the exact code section. Instant explanations grounded in the actual jurisdictional code book. A progress engine that finds your weak spots.
Five-minute drills. Picks up where you left off, remembers what you got wrong. Built to fit between jobs.
From apprentice to journeyperson, across the field.
We started with the electrical trades and grew the catalog as customers asked for more — now 42 trade licensing exam-prep apps, each purpose-built for its jurisdiction and code edition.
What is Deeun, exactly?
What is Deeun Inc.?
Deeun Inc. is a Canadian software company, founded in 2022, that builds modern exam-prep software for the skilled trades. It is independent, bootstrapped, and profitable, with no outside funding. Its flagship product is VoltExam.
What does Deeun make?
Deeun makes VoltExam, a family of mobile and web exam-prep apps covering 42 licensed trade and certification exams — from NEC electrician, HVAC, and plumbing to crane operator, CDL hazmat, NICET fire alarm, cosmetology, pharmacy tech, and real estate. Each app serves real exam-style questions tagged to the exact code section, with explanations grounded in the actual jurisdictional code book.
What is VoltExam?
VoltExam is Deeun's flagship product: modern, mobile-first exam prep for licensed trades and certifications. It offers practice questions tied to the exact code section, instant explanations, and a progress engine that surfaces a learner's weak spots. It is available on iOS, Android, and the web at voltexam.com.
How much does VoltExam cost?
VoltExam is a paid app with a free trial. Plans are $9.99/month, $24.99/year, or $59.99 for one-time lifetime access — and every app works fully offline. See current pricing at voltexam.com/pricing.
Does VoltExam work offline?
Yes. Every VoltExam app works fully offline, so you can study on a job site, in a mechanical room, or anywhere with no signal. It picks up where you left off and never depends on a connection you might not have.
Does VoltExam stay current with the latest code?
Yes. Every VoltExam question is tagged to a specific code edition, so as codes are revised and jurisdictions adopt new versions, items are re-checked, re-tagged, and retired across all 42 apps. The aim is that you study the edition your board actually tests on.
Which trades and certifications does VoltExam cover?
VoltExam covers 42 trades and certifications across six categories: skilled trades & construction; transportation & equipment; health, safety & environment; beauty & personal care; healthcare support; and business, finance & legal. See the full list.
Where is Deeun based?
Deeun Inc. is incorporated and operated in Canada, and serves customers worldwide.
Is Deeun venture-funded?
No. Deeun is fully bootstrapped and profitable, with no outside capital.
Can I prepare for more than one trade or certification with VoltExam?
Yes. Because Deeun makes all 42 VoltExam apps, someone who holds or wants more than one license can prepare for each exam in one place — an electrician adding NICET fire alarm, an HVAC tech adding EPA and backflow, a cosmetologist adding nails or esthetics. Every app uses the same code-tagged questions, explanations from the real code book, and offline study. More in The Second Ticket.
Does VoltExam explain the answers, or just score them?
VoltExam explains them. Every practice question is tagged to the exact code section, and each answer comes with a plain-language explanation grounded in the real code book — not just a right-or-wrong score. The goal is that you learn the rule well enough to handle a question you haven't seen, which is what a licensing exam actually tests. More in The Explanation Is the Product.
How does VoltExam decide what I should study next?
VoltExam includes a progress engine that targets your weak spots. Because every question is tagged to a specific code section, the app tracks which areas you keep missing and brings them back — while showing topics you've mastered less often — so your limited study time goes where it changes the result. More in The Weak-Spot Engine.
How long does it take to study for a trade licensing exam?
There's no single right number of weeks — it depends on the exam and on the hours you can protect each week, so it's better to set a weekly study rhythm you can keep than to chase someone else's timeline. What matters at least as much as how long you study is where the time goes: VoltExam's progress engine aims your sessions at the weak spots that decide a pass, so fewer hours do more. More in How Long Should You Study for a Licensing Exam?
How is VoltExam different from other exam-prep apps?
Three things. Every practice question is tagged to the exact code section and answered with an explanation from the real code book, so you learn the rule, not just the answer. A progress engine tracks the sections you keep missing and sends your study there, so limited time changes the result. And every app works fully offline, with all 42 built in-house by Deeun — so a second license uses the same study habit as the first. More on how that fits a working week in Studying While Working Full Time.
More on the about page — or browse all our writing, including what's inside a VoltExam app.