yen-yen – Expense Tracker
Everyone
info
10+
Downloads
About this app
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 web flow at https://kensaur.us/yen-yen/account/delete does the same thing.
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 kensaurus@gmail.com — a real human reads them.
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 web flow at https://kensaur.us/yen-yen/account/delete does the same thing.
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 kensaurus@gmail.com — a real human reads them.
Log what you spend in seconds. Budgets, bills, multi-currency. No bank login.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- No data shared with third partiesLearn more about how developers declare sharing
- This app may collect these data typesPersonal info, Financial info and 2 others
- Data is encrypted in transit
- You can request that data be deleted
What’s new
What's new in 1.22.1
• Internal improvements and stability fixes.
• Internal improvements and stability fixes.
App support
About the developer
KENSAURUS LIMITED LIABILITY COMPANY
kensaurus@gmail.com
1-10-8, DOGENZAKA
SHIBUYADOGENZAKATOKYU BLDG. 2FC
SHIBUYA-KU, 東京都 150-0043
Japan
+81 70-8459-3512
