Costxy splits bills, so you don't have to.

Whether it's a weekend trip, a shared house, or dinner with friends, Costxy keeps track of who paid for what and shows exactly who owes whom. Everything stays on your phone.

WHY COSTXY
- Works offline. Everything is stored locally on your device.
- Open the app and start using it — accounts and logins are not required.
- Balances update instantly. Add an expense and see who owes whom right away.
- Multi-currency. Each group can have its own currency.
- Backup and restore built in — export to a JSON file whenever you want.

FOUR WAYS TO SPLIT AN EXPENSE
- Even split — the default. Divide equally between everyone involved.
- By share — "Alex paid twice as much as Sam."
- By percentage — set exact percentages that add to 100.
- By amount — specify the exact amount each person owes, down to the penny.

Costxy handles rounding precisely. Every penny is accounted for.

SEE WHO OWES WHOM AT A GLANCE
The Balances tab shows the current state of every group. Costxy also suggests the minimum set of payments that settle everyone up, typically far fewer transactions than doing it pairwise. Record a settlement directly from the suggestion, or enter one manually.

PERFECT FOR
- Housemates and shared flats
- Group holidays and road trips
- Weekend getaways with friends
- Dinners, events, and nights out
- Couples tracking joint expenses

YOUR DATA, YOUR DEVICE
Costxy stores everything locally on your phone using SQLite. The app makes no network requests and operates without user accounts. You can export your data manually as a JSON file at any time and restore it on the same device or a new one. Uninstalling the app removes all data. Full privacy policy: sites.google.com/view/costxy/home.

Simple. Focused. Built for people who want their expense data to stay on their own device.