SplitJapan keeps the yen-and-I-O-U math out of the holiday

Field notes

The workflow records a payer, participants, description, and yen amount, then assigns each person a balance in their selected home currency. Exchange rates are fixed at the moment an expense is entered, and the interface aims to reduce settlement to the minimum number of transfers. The page says trip data remains in the browser and share link rather than being uploaded to SplitJapan servers; after further expenses, the group must share the link again.