Where did the
money go?
Now you'll know.
No bank login, ever. yen-yen gives your household a single calm ledger — with statement import, household sharing, and a Sunday review that replaces the Tuesday argument.
Add a transaction in the demo below, or download the app. We never ask for your bank password, never run an ad, never keep you in if you'd rather leave.
Try the demo before signing up. Household sharing, AI imports, Ask — included for founders.
- FamilyMartWant−¥420
- Restaurant BongoWant−¥4,800
- Life supermarketNeed−¥5,440
- Restaurant Kabi · with MioCulture−¥12,800
- Balmuda · kettleUnexpected−¥22,000
- SpotifyCulture−¥980
Four tiny questions.
One honest portrait.
One small ask, when you log a spend: what was this for? Need, want, culture, unexpected. That's it. (The idea is borrowed from a 1904 Japanese household ledger, but you don't need to know any of that — the question works on its own.)
After a few weeks the four buckets show where the money actually went. Skip the question whenever; the ledger still works.
Rent, groceries, the bus pass — the things you can't opt out of without rearranging your life.
The Friday coffee, the new running shoes, the Saturday brunch. Joy, on purpose, no shame.
A book, a course, a museum ticket, money sent home. Spending that makes you a little more you.
The vet bill, the broken laptop, the surprise plane ticket. The reason emergency funds exist.
Most ramen is a want. Sometimes it's culture. Once a year, it's unexpected.
You're not getting graded. The point is the asking. The label your future self looks back on three months from now is the truth — and it's almost always more generous than you'd expect.
Where does your money actually land?
Every transaction gets a kakeibo class. After a few weeks, your breakdown tells a story. Drag the sliders to explore what yours might look like.
Your spending personality
The Practical Planner
Based on your kakeibo balance · updates in real time
yen-yen computes your real breakdown after 2 weeks of entries. The balance score guides your Sunday reflection — not as a grade, but as a conversation starter.
Five small worries
you can stop carrying.
Weekly review, shared ledger, and statement paste — the parts that used to eat an evening.
Paste a statement.
Watch kakeibo classify it.
Paste the statement below. Skim the result. Fix the two lines it misread. Tap save. The thing that used to take a Sunday afternoon is the time it takes to finish the coffee — and nothing is written until you nod. Try it now — it's live.
"How much did I actually spend in Bangkok?"
Spend in baht on Tuesday, in yen on Friday — yen-yen remembers the rate from the day you spent, not today's. The number that comes back next year is the number you actually spent, not what the market thinks of it now.
¥168,000 = THB 37,800 · frozen at post · rate from the day you spent
Share the ledger. Skip the argument.
When you both look at the same numbers, the conversation gets shorter. Invite a partner, a parent, a roommate — everyone sees the same week, every edit is initialled, no one has to remember on whose phone the receipt lives.
Catches the receipt before it slips your mind.
The thirty seconds between the receipt and the next thing on your day are when most household ledgers go quietly wrong. yen-yen captures the line right then — signal or no signal — and reconciles later. The receipt never wins by attrition.
The day you'd rather leave, your data leaves with you.
Two taps for a CSV or QIF, two more to delete. Stored encrypted in Tokyo, walled off so no other household — not even ours — can read your week. No ads, no data brokers, no sticky exit.
Know before
you overspend.
yen-yen tracks each budget against the pace of your month — not just against the total. A budget at 90% on the 15th is a different problem than 90% on the 28th.
Set a weekly coffee limit. Watch it go gold as you near it. Never be surprised on a statement again.
Budget pulse
Demo data · your real budgets sync across devices instantly
At year's end,
yen-yen reflects back your story.
Every December, your household gets a Wrapped — an honest look at the year, with no judgement and no ads. The merchants you kept coming back to. The week you got it right. The number that surprised you.
Life supermarket
22 visits · ¥71,420 total
Restaurant Kabi · anniversary
¥28,400 · September
Week 22 · only ¥18,200
Your quietest, most intentional week. Under budget in every category.
The Practical Planner
312 entries this year · 54% Need · 20% Want · 14% Culture
Demo data shown above · your real Year-in-Yen opens after your first full year of entries
First 100 households get full yen-yen free.
Household sharing, statement import, Ask, and exports — included for founding users while we grow. No card. Spots are limited.
A calm household ledger — free while we find our first hundred.
- The whole ledger — every account, every line, every currency.
- Household sharing — invite partners into the same calm books.
- AI statement parsing, Ask, and tax/accounting exports.
- No ads. No card. No trial countdown for the first 100 households.
About early access
The first 100 signed-up households receive durable Founder access (Family features) at no charge. Checkout and in-app purchases are paused during this window. After the cohort fills, new accounts keep the free solo ledger; paid plans may return later. Your data stays in your workspace — never mixed with another household.
See our Terms of Use and Privacy Policy.
Questions about Founder access? Write kensaurus@gmail.com.
The questions we get asked the most.
01Do I have to give you my bank password?
Never — and please never give it to anyone who asks. yen-yen reads bank statements you paste in (a PDF, a CSV, or just the lines you copy from your banking app). Nothing is saved until you tap save.
02Will my partner see my therapist or my surprise gift?
Only what you choose to log to the shared household ledger. Each member also has a private workspace that only they can see. Use it for personal things; share what's actually shared.
03Where does my data actually live?
Encrypted at rest in Tokyo, walled off so no other yen-yen user — and no other household — can read your rows. Export the whole thing as CSV or QIF in two taps, and delete your account in two more.
04Does the AI see my whole bank account?
Only the lines you paste, only at the moment you paste them. It doesn't see your balance, your other accounts, or anything you didn't hand it. We log how much each parse cost so you can audit it yourself in Settings.
05We've been arguing about money for years. Will an app fix that?
No app ends every argument. Most money fights start with one person not knowing where the money went, and yen-yen makes that part take about ten minutes. The conversations that follow tend to be calmer when both people look at the same numbers.
06Why 'yen-yen' if I don't live in Japan?
Doubling a word is how friendly questions sound in Japanese — a soft "money, money?" whispered to yourself at the end of the month. The app speaks 27 currencies; use whichever ones fit your life.
07Will there ever be ads or upsells?
No ads, ever. Right now the first 100 households get full yen-yen free — household sharing, AI imports, Ask, and exports included. After Founder spots fill, the free solo ledger still works forever. We would rather lose you to another budgeting app than serve you an ad next to your grocery line.
08What is Founder access?
The first 100 signed-up households receive durable Family features at no charge while we grow. Checkout is paused during this window. Your data stays in your own workspace — never mixed with another household. Invite friends before spots fill.
Claim a founder spot.
Install on your phone — the demo runs straight from the app icon. Founders get household sharing, statement import, and Ask included. If it isn't for you, walk off with no email left behind.
No card. First 100 households only.