Release candidate
US Driving Test Prep
California Class C written-test practice with mock exams, wrong-answer review, bookmarks, and bilingual study modes.
iPhone
Offline
No account
Independent iOS app studio
Small apps with clear jobs.
Junzerg Apps is a growing portfolio of offline-first iOS tools for learning, exam preparation, and practical engineering work. Each app is designed to be focused, local-first, and independently useful.
Current Apps
The first public releases focus on exam preparation, where local content, clear explanations, and simple progress tracking matter most.
Planned
Citizenship Test Chinese
Chinese-language U.S. citizenship civics prep with bilingual questions, local progress, practice, and mock exam flows.
Exam prep
Bilingual
Offline-first
Flagship candidate
Optics Workbench
A professional engineering calculator for machine vision lens selection, sensor geometry, field of view, and optical layout planning.
Engineering
Local calculations
Pro tools
Product Lines
The portfolio is organized as independent apps, not one oversized platform. Shared patterns become reusable only after the first app proves them.
Exam Prep
Focused study apps for offline preparation, question banks, mock exams, wrong-answer review, and multilingual learners.
Engineering Workbench
Paid, local-first calculation tools for optics, machine vision, laser, pneumatic, thermal, electrical, mechanical, and materials work.
Privacy Model
First releases avoid accounts, backend services, ads, analytics, and tracking unless a product genuinely needs them later.