Apps#

I build, launch, and operate apps on my own.

This section brings together projects in many forms—mobile apps, web services, and Chrome extensions. Here, I share what I learned while handling the full lifecycle myself: planning, design, development, deployment, and ongoing operations.

I don’t only write about “launched apps.” I also document apps I decided not to ship and projects I’ve sunset—because there were clear lessons in those journeys too, and I want to preserve them.

What I cover#

• Planning: validating ideas, scoping, prioritization, and deciding on an MVP
• Design: UX flows, UI components, usability improvements, and design system considerations
• Development: architecture, technology choices, performance/stability, and maintenance strategy
• Launch & operations: releases, monitoring, user feedback, metrics/monetization, and iteration cycles
• Paused/sunset projects: why I stopped, what I missed, and what I’d do differently next time

How to read#

• Pick an app (or project) from the left sidebar to browse related posts.
• Operational experience evolves over time, so content may be updated frequently.

Latest Posts

Ladder Pick Development Plan

A detailed development plan for Ladder Pick, a ladder game app built and published as a ChatGPT App, covering architecture, MCP server implementation, and AWS deployment.

What Is an API Key? — How to Connect Directly to AI

Understanding API and API Key concepts, advantages of using AI directly with your own API Key, and step-by-step API Key guides for OpenAI / Google / Anthropic

Development History

The development history of Code Battle, from the 2017 MVP launch to the 2026 renewal.

Green Swagger

A Flutter-built eco-action social app submitted to the Gemini API Developer Competition (paused). The core is Green Bot.

Walkholic

A simple Google Fit app from 2015—built in a rush for the Google Fit Challenge, then unexpectedly selected as a Grand Prize Winner.

Smart Browser

An experimental Android browser built for Google Hackfair 2012, centered around a movable “remote control” UI.

Mission Omok (TAKE FIVE)

An experimental Gomoku game from 2014 that mixed territory control with missions and scoring, inspired by the puzzle-game boom.

Piano Keyboard

A keyboard app inspired by piano keys—built after realizing No Look Keyboard was too hard to learn, aiming for something simpler and more fun.

No Look Keyboard

My first shipped side project—an unconventional keyboard idea that started with a simple wish: typing without looking.