Money In, Money Out, and One Honest Number at Closing Time
Daybook is a money book for people who sell from a stall, a cart, a small shop or a farm gate. Three big buttons, Money out, Money in and Left over, a receipt you can send by chat, and a payment code with the amount already filled in. It is one app in five languages: you pick your country on first open, and in Vietnam it is called Sổ Lời, in Thailand สมุด, in Indonesia Bukuku and in the Philippines Listahan.
Read this guide in: English · Español · Português · Bahasa Indonesia · Tiếng Việt · Français · Deutsch · Italiano · 日本語 · 中文 · 한국어 · ไทย · Filipino · हिन्दी · العربية
The problem
You sold from six in the morning until the rice ran out. There is cash in the tin, more in your apron, four customers paid by phone, and the lady from the corner shop said she would settle on Saturday. Before opening you paid for chicken, charcoal, ice, plastic bags and an hour of help. So what did today actually make? Something, probably. The notebook is smudged, the app your son installed wanted an email address and a monthly plan, and the spreadsheet on the laptop has not been opened since March. What you need is small: what came in, what went out, what is left tonight. And if you grow durian or raise pigs, one more number at the end of the season, because feed and fertiliser go out for months before anything comes back.
How Daybook (Sales & Expense Book) works
- Open https://1usd.life/soloi/ on your phone, choose your country and your trade, then tap Install so it sits on the home screen like an app and keeps working with no signal.
- When you buy something, tap Money out, type the amount and what it was for, and take a photo of the supplier's bill if you want to keep it with the entry.
- When you sell, tap Money in and write it the way your trade works: one number, a few taps on your usual items, or weight, unit price and tare for a bulk sale, then save a receipt image and send it by chat.
- Tap Left over to see today's profit, and every week or so tap Send a copy to family so the book does not live on this one phone only.
What you get
- Three buttons, and big text for parentsMoney out, Money in, Left over. That is the whole front screen. During setup the app asks who will use this phone, and choosing My parents makes the text and buttons bigger with fewer words. There is also a one-page A4 guide in six steps that you save as an image, print at a copy shop and stick next to where they sit and sell.
- A receipt that goes out by chatAfter a sale, Daybook draws an image: a small receipt, or a full sales note with the total in words and two signature lines for buyer and seller. Save it and send it on WhatsApp, LINE, Zalo or Messenger. Every one carries a printed line saying it is not a tax invoice or fiscal receipt, so nobody mistakes it for one.
- A payment code with the amount already on itIn Vietnam the app builds a VietQR code offline with the amount filled in, and in Thailand a PromptPay code the same way. Anywhere else you photograph the QR code on your counter once, and Daybook shows it beside the amount in big digits. The app never moves money and cannot see whether it arrived: check your banking app, then tap Received.
- Seasons, for a crop or a batch of animalsA durian season or a batch of forty pigs runs for months, with fertiliser, feed and labour going out long before anything comes in. Put every entry into a season and at the end you get one number: profit for that season. Bulk sales take weight, unit price and tare, and Weigh in batches adds up crate by crate, with the number of weighings printed on the sales note.
- Who owes you, by nameSold on credit, or sent by delivery with cash on arrival? The sale sits in a Customers owe you list until you tap that it was collected, in full or in part. Names are remembered, and you can save a phone number to call the customer from the list. Shops can switch on a simple stock count, and the report shows a month or a season at a glance.
Private by design
There is no account, no server and no tracking. Everything you write stays in your phone's browser storage; nothing is sent to us or to anyone else, and Daybook is not connected to any tax authority. We hold no copy, so if the phone is lost or wiped without a backup, the book is gone, and the app reminds you of that often. Backing up is your job: tap Send a copy to family to pass the file on by chat, save a file to the phone, turn on daily auto-save to a folder on Chrome or Edge, or close an old year into its own file. Pro can lock those backup files with a password using AES-256.
Free vs Pro
What's new
v5.5 · 2026-09-25
- One-tap payment reminders: customers who owe for more than 7 days are flagged, and the app writes a polite message for your chat app or SMS — you just press send.
- “This week's profit” card every Sunday: in, out, profit, best day and a comparison with last week, as an image you can send to your children or family. Plus a calendar file that reminds you every Sunday.
- Example entries no longer count in today's total, and the book has its own two-column layout on computers.
FAQ
Is Daybook free, and what does the one dollar buy?
The free version works forever with no limit on entries. Pro is one US dollar, paid once, not a subscription. It adds a password on backup files, your shop logo on receipts and sales notes, removal of the Made with Daybook line, and CSV export of the whole book for a spreadsheet. Daybook is made by 1USD.life, a one-person studio.
Can it print receipts, scan barcodes or collect the payment for me?
No. Daybook is not a POS system or a cash register: there is no thermal printing, no barcode scanning, no online payment and no sync between two phones. It writes money down, makes a receipt image you send by chat, and shows a payment code. The code only tells the customer where to send the money and how much; the app cannot know whether it arrived, so look at your banking app and then tap Received.
Does it work without internet, and on an iPhone?
Yes. Once it is on the home screen it opens and works with no signal, on Android, iPhone and desktop. The only things that need a connection are checking a Pro code and, of course, the customer's own bank transfer. Daily auto-save to a folder works on Chrome and Edge; on an iPhone use Send a copy to family or Save file to phone instead.
What happens if I lose my phone?
If you have a backup file, open Daybook on the new phone and tap Restore from file, and the whole book comes back. If you have no file, it is gone, because there is no copy on any server and the book does not sync between phones. That is why the app keeps asking you to send a copy to family or save a file.
Can I use it for my taxes?
Daybook is your own private record. It is not connected to any tax authority, it gives no tax advice, and its receipts and sales notes are not invoices. The optional tax line is off by default; turning it on only adds a number you typed to your own receipt and does not make it an invoice. For what you must file, ask your tax office or an accountant.
Can it remind customers who haven't paid?
Yes. Anyone who has owed you for more than 7 days is flagged in the debt list. Tap Remind and a polite message with their name, the amount and the date is ready in your chat app or SMS — you read it and press send. The app never sends anything by itself.