A licensing exam is only as current as the codebook behind it — and codebooks change. New editions land on a schedule, jurisdictions adopt them on their own clock, and a practice question that was right last year can quietly go wrong. Keeping 42 apps honest about that is most of the work nobody sees.
When people picture exam-prep software, they picture a pile of questions. The questions matter, but they're not the hard part. The hard part is that the rules underneath them move. The VoltExam apps are built on real codebooks and standards, and those documents are revised on cycles that have nothing to do with our release calendar. A question tagged to a section that got renumbered, or an answer that reflects a rule that was superseded, isn't just untidy — it's the kind of thing that costs someone an exam.
So a big share of what Deeun does isn't writing new questions at all. It's keeping the ones we have current, across every app in the catalog, as the codes move.
Most trade standards revise on a fixed cadence. The National Electrical Code, for example, is republished every three years; many other codes and certification blueprints run on their own multi-year cycles. If that were the whole story, staying current would be a calendar reminder.
It isn't, because publication and adoption are two different events. A new edition can be printed years before a given state, province, or licensing board actually tests on it — and some jurisdictions stay a cycle or two behind on purpose. So at any given moment, the "correct" answer for a candidate depends on where they're sitting the exam, not just what the newest book says. The version that matters is the one their board adopted.
The newest codebook isn't always the right one. The right one is whatever your board adopted — and that's a moving map.
It's easy to keep one flagship app current and let the long tail drift. We don't accept that. Staying current, for us, has to mean the same thing in the cosmetology app and the crane app as it does in the electrician app:
The unglamorous machinery behind "current" is mostly bookkeeping done well: watching the revision cycles and adoption notices for the trades we cover, mapping each question to the edition and section it depends on, and re-checking those mappings when an edition turns. Because every VoltExam question already carries its code-section tag — the same tagging that powers the in-app explanations — a code change becomes a search-and-review task instead of a blind re-read of the whole bank. The structure we built for studying turns out to be the structure that keeps studying accurate.
Forty-two apps means forty-two revision calendars to watch instead of one. A bigger company might treat that as a reason to thin the catalog or freeze the smaller apps. For a small, bootstrapped team it's the opposite: the only way the long tail earns trust is if the barber studying for a state board exam gets the same currency guarantee as the electrician. Holding one standard across the whole catalog is harder than holding it across the flagship — and it's exactly the kind of stubbornness that's worth it, because the cost of getting it wrong lands on someone's license.
Code editions and adopted versions vary by trade and jurisdiction; always confirm which edition your board tests on. See voltexam.com for what each app currently covers.
Read next: The second ticket → · All articles · About
© 2026 Deeun Inc. · About · Press · Contact · Privacy · Terms