Apps I want to use,
made and put here.
chordup is where I build the apps I find myself wanting, and put them out.
Double-click an icon (tap on a phone) to open it. Drag a window by its title bar.

Sudoku AI Coach
A sudoku that, when you're stuck, shows you how to think your way to the next number instead of just giving it away.

Killer Sudoku AI Coach
Killer sudoku, where cage totals are your clues. It teaches you how to think through cage combinations and the Rule of 45, not just the answer.
chord = several notes sounding together
up = upward
When I want an app, I make it. When it's done, it goes here.
chordup is a personal brand that keeps doing exactly that.
Check back now and then to see the icons pile up.
How chordup's site and apps handle your information is described in the privacy policy.