Weigh a hundred baskets.
Not one missed.
The shrimp weigh book on your phone — made by a shrimp farmer in Cà Mau. One tap per basket, money worked out by size, deposits taken off, debt tracked for every trader.
First 39 weigh sheets free · No internet needed · No ads
One basket off is more than ten kilos of shrimp — real money gone. Both sides look at the same number, no arguing at 3am.
Three steps and you are weighing
No account, no internet. Install and start.
1
Open a weigh sheet
Name the trader, set the price, pick the size. Then weigh.
2
One tap per basket
Kilos add up, money works itself out. Tapped twice? Undo puts it right.
3
Settle and send
Deposits off, final number out. Send the receipt — both sides hold the same figure.
So I built it around one weigh session
From the net coming up to the money coming in, then the end-of-crop reckoning — all in one app, not one button more.
“By basket seventy-something I am no longer sure.”
One tap per basket, the phone buzzes, kilos add up. Tapped twice? Undo puts it right. Each net haul gets its own total, leftover or missing kilos are rounded together, and every haul has a note field.
“Each side keeps its own book, and its own number.”
Every basket shows on screen as it lands — both sides read the same figure. Then send the receipt; any trader can open it.
“Crop is over and I still cannot tell which one paid.”
The numbers stay in the app: output per farm, price by size, two crops side by side — so the next one goes better.
TAP A BASKET
One basket, one tap.
Shrimp goes in the basket, one tap records it. The phone buzzes — your eyes never leave the scale.
- Big buttons — wet hands still hit them.
- Tapped twice? Undo sets the count right.
- Turn on read-aloud: the app calls out each basket, no signal needed.
DEBT
Who still owes, and how much.
Filter the unpaid sheets, tick off each part payment. Call straight from the app, send the receipt over chat.
- Debt per trader, every part payment recorded.
- Merged settlement: many sheets, one trader, one number.
- Send the receipt as an image or PDF — anyone can open it.
STATISTICS
Which crop paid, which month hit.
Output by farm and by year, price by size, two crops compared — you see which one paid and which one sold short.
- Revenue by month and by trader.
- Price by size, so you time the harvest.
- Close the book at the end of the crop, export to Excel if needed.
FOR TRADERS
Four or five ponds a day, and still one clean number at the end of it
- Merge several ponds of the same owner into one settlement.
- A debt ledger per person: how much is left, how many days, call to remind from inside the app.
- Receipts as text, image or PDF — every pond owner can open them.
- The owner watches every basket land, so nobody argues at 3am.
What people say about Sổ Cân Tôm
Real words and real screenshots from people weighing at the pond — and the suggestions that became features. Vietnamese only.
See what people say →Two choices, nothing complicated
Weigh 39 sheets free. If it earns its keep, unlock Pro once and keep it for good.
Free
0₫
Start now, no account needed.
- 39 weigh sheets for life (9 open at a time)
- Weigh · price by size · deposits off · send receipts
- Send a whole weigh sheet by AirDrop or chat — it opens straight in the other phone’s app
- Picture handbook — 42 screens
- Three display modes: Light · Sunlight · Dark
- Works offline, no ads — data stays on your phone
After 39 sheets you must delete old ones to keep weighing — and the free version has no backup, so deleting loses last crop’s numbers.
Get the free appPay once
Pro for life
299,000₫
About the price of a few kilos of shrimp. Pay once, keep it forever.
Everything added later is included, at no extra cost. No hidden fees, no auto-renewal.
- Unlimited weigh sheets
- Backup & restore — change phones without losing anything
- Full debt ledger per trader · merged settlement across ponds
- Full statistics: output · revenue · price by size · crop comparison
- Read kilos aloud · image and PDF receipts · Excel export
Want to try Pro for one crop first? There is a yearly plan at 199,000₫/year, cancel anytime — but two years already costs more than buying it for life.
No ads, everNo data selling · Your data stays on your phone
Exactly eight differences
| Feature | Free0₫ · forever | Pro299k for life |
|---|---|---|
| Weigh sheets | 39 · 9 open at a time | Unlimited |
| Backup & restore (change phone, keep everything) | — | ✓ |
| Full debt ledger per trader | — | ✓ |
| Merged settlement across ponds for one trader | — | ✓ |
| Statistics: output · revenue · price by size · crop comparison | — | ✓ |
| Image / PDF receipts (A4 sign-off layout) · Excel export | — | ✓ |
| Reads kilos aloud while weighing | — | ✓ |
| Farm → Pond management with per-farm reports | — | ✓ |
| EVERYTHING ELSE IS THE SAME | ||
| 3 weighing modes · unlimited basket grid · undo · leftover kilos merged · money added up | ✓ | ✓ |
| Per-sheet settlement · per-sheet debt tracking · send receipts | ✓ | ✓ |
| Send whole sheets by AirDrop or chat · 42-screen handbook · three display modes | ✓ | ✓ |
| 100% offline, data on your phone · no ads | ✓ | ✓ |
Scroll the table sideways to see both columns.
Prices include tax, paid through the App Store / Google Play. The lifetime plan never auto-charges.
WHO MADE THIS
A shrimp farmer built it for the person holding the scale
My family farms shrimp in Cà Mau. One harvest runs a hundred baskets; empty a whole pond and it can be three to five hundred, weighing from midnight to sunrise. The paper book sits beside the scale: wet hands, wet paper, ink running. Slip one column and you lose several rows — over seventy kilos of shrimp. Then at reckoning time each side holds its own book, and its own number.
Four years ago I borrowed a rice-weighing app, made over three hundred sheets with it, and even tracked down its author to send suggestions. But shrimp is different: sizes, deposits, debt per trader, farms and ponds. Nobody was building it, so I did — for my own family first, then for the farmers around us.
“Throw the paper book away — the numbers stay, and both sides can read them.”
Questions
Does it need the internet?
No. Weighing, pricing and debt all run offline at the pond. The data lives on your phone.
Is my data safe?
Yes. It stays on your phone, it is never sent to any server, and the app runs fully offline. Backing up to an Excel file is a Pro feature.
How much is free?
The first 39 weigh sheets, enough to get through a crop. After that, Pro removes the limit.
What if I change phones?
With Pro, back up to Excel on the old phone and restore on the new one — everything merges back. The Pro licence is restored through your App Store / Google Play account. The free version has no backup, so switching phones loses the old numbers.
If I lose the phone, do I lose everything?
The data lives on the phone, so yes. That is why Pro has Excel backup — back up every few weigh sessions and send the file to yourself.
Does Pro bought on iPhone work on Android?
No. The two stores bill separately, so the licence belongs to one of them. Moving between phones on the same system restores with your old account, no second purchase.
Can two people weigh on the same sheet?
Not yet. A sheet lives on one phone. To hand it over, send the whole sheet by AirDrop or chat and it opens straight in the other phone’s app — the free version can do this too.
My scale shows two decimals — can the app record that?
The version on the stores records one decimal. Two decimals and basket tare are in the next release — exactly what users asked for. See the Updates page (Vietnamese).
One person cannot get this right alone
I write this app on my own, and I cannot foresee everything that happens at the pond. You are the one holding the scale — if something is hard to tap, missing or wrong, tell me. Every message is something I can fix, and I credit the people who tell me on the What people say page.
Start weighing right, today
Install it and weigh with it today. First 39 sheets free, no internet needed, no ads.