Plenty of people in the trades don't hold just one license. An electrician picks up a fire-alarm cert. An HVAC tech adds EPA and backflow. A cosmetologist adds nails, then esthetics. Careers in the trades are built by stacking tickets — and the study tools almost never keep up.
Walk a job site and you'll meet people who carry more than one card. The work rewards it: a second license opens a second kind of job, a higher rate, or a slower season made busier. But every new ticket means another licensing exam, another codebook, and — usually — another scramble for decent study materials. That last part is the one nobody plans for.
Most of the exam-prep market is organized one exam at a time. You buy an electrician app from one shop, a fire-alarm study guide from another, and an EPA prep course from a third. Each one looks different, works differently, and asks you to learn its quirks before you can learn the actual material. The second time you sit down to study in a career, you start over from scratch — not on the trade, on the tool.
This is the gap VoltExam was built to close. Because Deeun makes every app in the catalog, the second one feels like the first. The same code-tagged questions. The same explanations pulled from the real code book. The same progress engine finding your weak spots, and the same study that works fully offline in a truck cab or a mechanical room. You don't relearn the app. You just learn the new trade.
The hard part of a second license should be the trade — not figuring out a brand-new app the night before the exam.
That sounds small until you've lived it. A consistent tool means the habit you built passing your first exam — the five-minute drills between jobs, the way the app surfaces what you keep getting wrong — carries straight over. The muscle memory is already there. What changes is only the content, and the content is the part you actually came to study.
We didn't set out to make forty-two apps for the sake of a big number — that story is its own piece. But the longer the catalog runs, the clearer the second reason for it gets: a wide catalog means the next ticket a customer needs is usually already there. The electrician who decides to add NICET fire alarm doesn't have to leave. The HVAC tech adding backflow finds it under the same roof, working the same way.
Covering 42 trades and certifications — from NEC electrician, HVAC, and plumbing to crane operator, pharmacy tech, and real estate — isn't a vanity metric. It's a bet that people grow, and that the tool that helped them pass once should still be useful the next time the work asks them to level up.
There's a quieter benefit, too. Fragmenting your prep across five vendors means five logins, five things to re-buy, and five companies to re-trust at the exact moment you can least afford a study tool that disappoints. Keeping a person's whole certification journey in one place is less friction for them — and, frankly, it's why people come back to us instead of starting a fresh search every time their career takes a turn. For a small, bootstrapped company, that trust is the entire business.
A license is a door. Most people in the trades walk through more than one. The least their study app can do is hold the next one open.
Available trades and certifications vary; see voltexam.com for the current catalog and what each app covers.
Read next: The explanation is the product → · All articles · About
© 2026 Deeun Inc. · About · Press · Contact · Privacy · Terms