A shared trip planner with an itinerary and a running tab

The problem

Group trips end up scattered across a group chat, a notes app, and someone's memory of who covered the rental car. Plans change, and nobody is sure which version of the schedule is current. At the end, one person does the math on receipts to work out who owes what, and it often leads to awkward back-and-forth.

What we’d build

• •An itinerary screen where anyone with the link can add, edit, and reorder days and activities, with times, places, and notes.
• •An expense screen to log what was spent, who paid, and who it was split between (evenly or by custom amounts).
• •A balances screen that shows each person's net total and the fewest payments needed to settle up.
• •A people list for the trip, so expenses and plans are tied to names.
• •One integration of your choice: a Google Sheets export of expenses, or an emailed summary at the end.

A concrete example

Six friends are renting a cabin for a long weekend. One person creates the trip and shares the link in the group chat. The itinerary has a day-by-day list: Friday arrival, Saturday hike, Sunday checkout. Anyone can add a dinner reservation or a note about parking. Groceries, gas, and the cabin deposit go into the expense screen with who paid and who shares each cost. The balances screen shows that two people owe the person who paid for the cabin, and for how much. At the end, the group exports the expenses to Google Sheets. It tracks IOUs only and does not move money.

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