chordup › About chordup
About chordup
chordup is a personal brand: I build the apps I want to use and put them out as they're finished. The first ones are puzzle apps, but chordup isn't limited to puzzles — whatever I find myself wanting comes next.
The name
A chord is several notes sounding together; up means upward. The idea is to stack small apps one at a time until together they make something worth hearing.
Rules I follow
- Only build things I'd want to use every day
- Help people understand, not just hand over answers (the puzzle apps teach the reasoning through hints)
- Where correctness matters, check it with code instead of trusting AI; AI only rephrases explanations
- Keep apps free to use. Ads may help cover costs, but they stay out of the way of playing
- Collect only the information that's needed, and explain it in the privacy policy
Apps so far
- 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.
Contact
For feedback or bug reports, use the Contact form on the desktop or email info@chordup.io.