Group Expense Splitter Settle Up

Paste into Claude Code and it builds a private, offline expense splitter for trips, rent, or any shared cost — zero dependencies, zero account. Add expenses split equally, by exact amount, by percentage, or by weighted shares; see live per-person balances and a "simplify debts" settle-up panel that works out the fewest payments needed to square everyone up, one tap. All data stays in your browser via localStorage, with JSON export/import. Works with WiFi off.