Costbook

All your spending in one place.

Monthly bills, trips, events or any project: Costbook keeps a separate list for every budget. Scan a receipt and AI fills in the amount and category. In shared lists, Costbook works out who owes whom.

Download on theApp Store

Platform: iPhone, iPad, Apple Watch
Released: October 2026
App Store rating: 5.0

Costbook’s Split screen showing who owes whom in a shared list

Costbook’s home screen: today’s spending, the last 12 months and expense lists

Highlights

Logging an expense takes seconds.

Every Costbook feature answers the same question: where did your money go, and who owes whom?

Scan it, done
Scan a receipt or invoice and the amount, merchant, category and date fill themselves in.
Fair splits
In shared lists, it works out who owes whom with as few payments as possible.
Budgets
Set a budget for any list and see what’s left and today’s share.
Widgets and Apple Watch
Home Screen and Lock Screen widgets, Live Activities and quick entry from your wrist.
Device first
Your data lives on your phone first and works offline; it syncs across devices once you’re connected.
Any currency
Every list keeps its own currency, and the app is just as comfortable in light and dark mode.