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Series · 5 postsVisit myfincup.com

Building MyFinCup

Rebuilding a budgeting app from scratch. The decisions, bugs, and why couples' finances need a better approach.

Part 1
4 min read

Why I rebuilt a budgeting app from scratch (instead of using YNAB or Mint)

YNAB and Mint couldn't answer 'am I overspending right now?' So I built an app that could.

Part 2
5 min read

Inside the "Shared Journey": how MyFinCup lets two people trust one dashboard

One dashboard, two people, no mode switcher. How the database — not the app — decides who sees what.

Part 3
4 min read

Keeping 40+ AI coding sessions from turning into a Frankenstein app

Color tokens are the easy 20%. Here's what actually kept 43 AI sessions looking like one app.

Part 4
4 min read

The 404 that only strangers could see

It worked every time I tested it, and failed for everyone else. Here's why that's not a coincidence.

Part 5
5 min read

Porting a feature between two apps: what I hardened, what broke anyway

The math was already proven. The lesson from a bug I'd already fixed once didn't come along for the copy-paste.