yen-yen – Expense Tracker

Track every expense in seconds across accounts and currencies. Budgets, bill reminders, receipts. No bank login, no ads. First 100 households get full features free.

Most budget apps want to log into your bank account. yen-yen doesn't.

You type what you spent, hit save, and get on with your day. That's the whole interaction.

It's built around kakeibo (家計簿), the Japanese household-ledger habit that's been around for over a hundred years. Every entry asks four small questions:

· Did I need it? · Did I just want it? · Does it feed something I love? · Did I see this coming?

Sit with the answers for a minute. That minute is the point.

FREE, FOREVER

Multi-account ledger across cash, banks, cards, and loans. Multi-currency with historical FX so a coffee in Tokyo last March still reads in JPY but totals correctly in your home currency. Budgets and bill reminders. Kakeibo classification on every entry. CSV / JSON import + export. Photo attachments for receipts. Account deletion you run yourself.

No ads. We don't sell your data. We never ask for your bank password.

OPTIONAL ADD-ONS

· Sharing a household ledger with a partner or roommate. · AI-assisted statement parsing — you paste the lines, you approve every row, nothing auto-saves to your ledger. · Longer audit retention. · Priority support.

WHAT YEN-YEN WILL NEVER DO

· Connect to your bank. · Auto-write AI guesses into your ledger. · Send push notifications about your spending habits. · Show ads.

ACCOUNT DELETION

In the app: Settings → Account → Delete. You get 14 days to undo it, after which the data is hard-deleted within 24 hours. The Data Safety form lists the same web flow at https://kensaur.us/yen-yen/account/delete.

HOSTING + PRIVACY

Hosted on Supabase, encrypted in transit and at rest.

Privacy policy: https://kensaur.us/yen-yen/privacy Terms: https://kensaur.us/yen-yen/terms

Made by kensaurus LLC in Tokyo. Questions or bug reports go to yenyen@kensaur.us — a real human reads them.