Apps I built, hands-on practice notes, and step-by-step lessons in one place.
5 services I built and run.
Learn Korean / English from a single screenshot
Capture any screen — webtoons, SNS, news — and the words inside become your daily language tutor. Listen, repeat, practice. Phone or PC.
Your personal flavor diary
Log today's meal as 'loved / try again / not for me / not sure' — a light tap is all it takes. Browse later by source or date.
Price · medical · long-term-care public-data platform
pryzeet.duckdns.org
From price-sharing to wishlist, ledger, and re-buy in one flow. Compare salaries, medical fees, and long-term-care facilities — all in one place.
Chat that answers from your own documents
dmddksl.duckdns.org
Drop in your documents and images, then ask. Answers come grounded in your own files — never sent outside, always cited.
A garden-of-the-heart diary
da2ari.duckdns.org
Keep your diary, anniversaries, routines, and goals in one place — and read your daily horoscope alongside. A Korean-first, mobile-first daily companion.
A development primer for beginners — and a portfolio of the apps I built.
From turning on the computer to running your first code. A 5-step climb for beginners.
A single arc from your first HTML line to React 19 + Next.js 16 + Tailwind in 10 steps.
From `pnpm create` to PostgreSQL via Drizzle ORM, deployed to Fly.io. 4 hands-on steps.
A 7-step path through a real backend — from the first line to auth, tests, and deployment.
One language, end-to-end: API, scheduling, external data, observability, practical patterns.
A 7-step path to using AI tools beyond chat — MCP, Skills, Subagents, workflows, and design-side tooling.
A full-stack developer building practical tools and public-data services across mobile (Tauri/Flutter), web (Next.js), and backend (FastAPI/Spring), with a focus on AI/LLM integration.