Independent software studio
Anvil Digital Apps makes offline-first practice apps for US trade certification exams. Every question is written against current federal source material, every answer is explained, and the whole thing works without a signal — because our users are studying in a cab, a yard, or a mechanical room.
One shipping product, built deep rather than wide.
Commercial driving & refrigerant handling
Nine CDL categories and all four EPA Section 608 certifications in one offline app. Timed mock exams at real pass marks, an explanation behind every answer, a spaced-repetition deck built from your own mistakes, and readiness tracking for each category you are working towards.
Android · Google Play
The same study engine is being extended to further licensing exams. If there is a certification you want covered, tell us and it goes on the list.
The entire question bank ships inside the app. No login, no sync, no server that could go down the week before your test.
Forty percent of every category is free forever. One optional purchase unlocks the rest and removes advertising. Never a subscription.
Three commitments that decide every other choice in the product.
01
Questions are written against the FMCSA CDL manual, 49 CFR for hazardous materials, and 40 CFR Part 82 for refrigerant handling. Nothing is reproduced from an official exam.
02
Both exams turn on thresholds — cut-out pressures, evacuation levels, placarding limits. Every figure is verified against the regulation text rather than written from memory.
03
Every question states why the correct answer is correct and which rule it comes from. The knowledge has to survive past the test.
Support, corrections and business enquiries all reach the same inbox, and a person reads it.