Chilavu ചെലവ് · expense

A personal expense book that keeps its contents to itself.

Every entry is encrypted on your device before it leaves. The server stores what it cannot read: no amounts, no merchants, no notes, no names of who owes whom.

Open the app at app.chilavubook.com See it step by step

It runs in the browser and can be added to a phone's home screen. Nothing to install from a store.

Signing up takes an invitation. Someone already in can send you a book, or write to admin@chilavubook.com and ask for an invite code.

What it looks like

Pictures from five demo people. The walkthrough follows them through every feature, with steps to try each one yourself.

Everything: every expense across all your books, with what was spent this month and totals by category — **Everything at once** Every expense from every book you hold, what you spent this month, and where it went by category. Tap + and say whom it was with; it stays in your book and they see their part.

A book: its expenses, spent this month, receipts beside entries — **Books the way you file them** Personal, the household pot, a trip. Categories and places are the book's own. A photo of the receipt sits on the entry, encrypted like everything else.

Adding an expense: amount, what for, when, category, place, paid from, and with whom — **"With" on any expense** A dinner with Ravi goes in your book; Ravi sees his share, the date and the note, and can change his share. Someone not on the app can hold a share too.

People: everyone you share a book with, what stands between you, settle, safety number — **People, not ledgers** Everyone you share a book with, what stands between the two of you, a button to settle it, and a safety number to compare once so you know their key is real.

Money: cash, accounts, cards and assets, with a balance sheet — **Where the money is** Cash, accounts, cards, an asset or two. An expense draws on a source; income, transfers and revaluations keep the balance sheet true, in a book only you can read.

Sharing a book: an invite link as a QR code, and the safety number — **Share by link or QR** A link carries nothing secret. Whoever opens it asks to join, and you let them in or not. Removing someone gives the book a new key.

Account: invitations, books, notifications, backup, security, another device — **Yours to keep** A backup file sealed under your own passphrase, restorable anywhere. A passkey or passcode on each device. Twelve words that are the account; nobody can reset them, and nobody can read past them.

Account: a sixteen-digit number the server issues you. No email, no password.
Key: twelve words shown once, kept by you. Lose them and the book is gone; nobody can reset it.
Sharing: a link or a QR code, and a safety number you compare once.
Server: holds ciphertext and who shares a book with whom. Nothing else; there is nothing else to leak.