MES/WMS consultant · Software developer

A workshop of someone
just working hard.

I'm jk. I build systems for factories and warehouses, and after work I make small apps and services. I write up how they get made here.

Recent posts

No posts in English yet.

Projects

2 apps · 1 web service

01

macOS app · 2026.07 · Free

Bluetooth Battery Bar

I made this because I hated finding out about my mouse battery only after the mouse had died. It shows keyboard, mouse, and AirPods battery levels together in the menu bar, and lets you know when they run low.

Last updated 2026.07.30 · v1.0.0

Bluetooth Battery Bar in the menu bar

02

macOS app · 2026.11 · Free

Junction

I built this file manager because going up to the parent folder in Finder was frustrating. You move around with the folder tree on the left, search files on this Mac, iCloud, OneDrive, and Google Drive all at once, and see recently changed files at a glance.

Last updated 2026.11.05 · v0.2.0

Junction's Recent Updates screen

Write me
a letter.

Questions about the apps, collaboration ideas, or anything about MES/WMS are all welcome. I usually reply within a few days.

If your mail app doesn't open, write to ko.leejk@gmail.com.