Deeun didn't set out to make forty-two apps. It set out to make one good one — for electricians — and then kept answering the same question from a new trade each time: "Can you build mine?"
Every catalog has an origin story, and ours is unglamorous. VoltExam began as a single app for one exam: the NEC electrician licensing test. The bet was narrow and specific — that if we tagged every practice question to the exact code section and explained each answer from the real code book, electricians would pass faster than they did with a photocopier and a stack of luck. That bet held. And then something we didn't plan for happened.
An HVAC tech emailed and asked whether we'd build the same thing for the EPA 608 and the mechanical code. Then a plumber. Then a welder studying for the CWI. The request was always the same shape: "You did this for electrical — do it for mine."
We could have written a five-year plan and chased a number. Instead we let the customers draw the map. Each new app earned its place because real people in that trade asked for it — which meant we were never guessing at demand, only at execution. That discipline is why the catalog reads the way it does today: it started in construction and the building trades, then followed the people who kept asking.
Today that adds up to 42 licensed trades and certifications — 41 shipping, with one more en route.
The catalog grew. The standard inside each app didn't move an inch.
The hard part of going from one app to many isn't volume — it's resisting the temptation to cut corners as you scale. A flashcard deck is cheap to copy forty times. What we copy instead is a standard, and it's the same in the cosmetology app as in the electrician app:
It would be faster to ship thin apps and call it forty-two. We'd rather ship forty-two that each earn the install.
Deeun is bootstrapped and profitable, with no outside capital, and that shapes everything. We don't have to manufacture growth to satisfy an investor; we can let it come from people who actually want the next app. It keeps us honest about the only metric that matters — whether someone walks out of the testing center licensed — and it lets a small Canadian team keep a high bar across a wide catalog.
Forty-two is not the finish line; it's where the demand has taken us so far. The next app will arrive the same way every other one did: a tradesperson will ask, and if we can hold the standard, we'll build it.
"41 shipping · 1 en route" reflects the live catalog as of June 2026. Trade coverage and editions vary by app — see voltexam.com for current availability.