Projects grouped by what they're about — badges show maturity (Live · Beta · Concept).
My Study Know-hows — a platform about how to study itself: evidence-based study methods, elementary Korean/math/science/social studies, English (PTE) and German (A1–C1) tracks with speech trainers, and coding.
Essential Guitar Chords — 218 searchable voicings across open chords, open-tension forms, alternate tunings, jazz drop-2/drop-3, and electric triads. Every diagram plays, labels its notes, and works offline.
A picture-book reader with narration, built from a pipeline that turns pptx/ppt/pdf/image sources into a browsable book view. Made for my own kids' early reading, and in daily use.
Interactive beginner's guide to worship drumming — bilingual (EN/KR), every pattern an audible looping GrooveGrid with a tempo trainer. Crash course first, then the fundamentals that earn it.