WariSaku Complete Guide: Start Splitting Costs in Seconds — No Account Needed
Kona5 min readTable of contents
After a trip or a dinner out with friends, tracking down who owes whom always seems to take longer than it should. You're juggling screenshots of receipts, mental math that doesn't quite add up, and that one person who always says "I'll sort it later."
WariSaku fixes this with a browser-based expense splitter that needs no app install and no account. Learn the four-step workflow below and you can start using it today — plus the weighted splits and multi-currency support that make it hold up on real trips.
What Is WariSaku?
WariSaku is a web-based group expense tracker you open directly in your browser. No App Store, no sign-up — just open the URL and start. It works on any device, and everyone in the group can access and update the same record by sharing a single link.
The feature that makes WariSaku stand apart is its minimum-settlement algorithm. In a five-person group where everyone pays for different things, settling one-to-one would require up to ten separate transfers (N×(N−1)÷2). WariSaku's minimum-settlement algorithm cuts a five-person group down to at most four transfers (N−1) — and shows you exactly who pays whom and how much.
Here's a quick overview of what's included:
- No sign-up or install (browser-only)
- Minimum-settlement algorithm to cut transfers to the minimum
- Weighted splitting (assign custom ratios per member)
- 16 currencies with automatic exchange rate fetching
- Shared group link for real-time multi-user editing
- LINE share and QR code sharing
- Transaction deletion with history restore
- Rounding options (to the nearest cent, $1, $5, or $10)
Related readHow the Minimum-Settlement Algorithm Works (With a Real Example)
The Basic Workflow (4 Steps)
Step 1: Create a Group
Go to https://warisaku.com and tap Create a Group. Enter a group name — something like "Kyoto Trip 2026" or "Friday Dinner" — and add the names of everyone in the group. Nicknames work fine.
Once you save, WariSaku generates a unique URL for your group. That URL is your group's identity — share it, bookmark it, and don't lose it.
Step 2: Share the Link with Everyone
Send the group URL via LINE, iMessage, WhatsApp, or any messaging app. WariSaku has a built-in LINE share button and QR code generator, so if your group is all in the same room, you can have everyone scan and join in seconds.
Because there's no app to install, nobody can use "I don't have the app" as a reason to opt out.
Step 3: Record Each Payment
Inside the group, tap Add expense whenever someone pays for something. You'll enter:
- Who paid
- What it was for (e.g., "Dinner", "Taxi")
- The amount
- Which members it covers
Example: Three people at a restaurant, total $60
Person A pays the full $60. You enter: Paid by A, "Dinner", $60, covers everyone. WariSaku instantly calculates that B and C each owe A $20. Anyone in the group can add entries — the organizer doesn't have to handle everything.
Step 4: Check the Settlement
When everything's been recorded, open the Settlement view. You'll see a clear list of "who pays whom, how much" — already optimized to the minimum number of transfers by the algorithm.
Then everyone settles up using PayPay, Venmo, a bank transfer, or whatever your group prefers. For a full trip-length walkthrough, see three real group travel scenarios with WariSaku.
POINT
Everyone sees the same Settlement view through the shared URL. The organizer doesn't have to message each person their amount — everyone just opens the page and pays what it shows.
Advanced Features
Weighted Splitting: When Equal Isn't Fair
Sometimes splitting evenly doesn't reflect the situation — a team dinner where the manager wants to cover more, or a trip where one person uses significantly more resources. Weighted splitting lets you assign a multiplier to each member.
Example: Three people at dinner, total $200, with a 2:1:1 ratio
| Person | Multiplier | Share |
|---|---|---|
| A (pays more) | 2 | $100 |
| B | 1 | $50 |
| C | 1 | $50 |
The app divides the $200 total by the combined weight of 4 (2+1+1) to get one unit ($50), then multiplies each member's multiplier by that unit. Rounding settings handle any leftover amounts.
Multi-Currency: One Group for International Trips
Overseas travel means payments in multiple currencies — local currency at restaurants, your home currency at duty-free, maybe dollars for a tour. WariSaku supports 16 currencies, and when you log a transaction in a foreign currency, it automatically fetches the exchange rate for that date and converts everything to your group's settlement currency.
Example: Logging Korean won during a trip to Seoul
- Item: Samgyeopsal dinner
- Currency: KRW (Korean won)
- Amount: 80,000 KRW
- Rate: Fetched automatically for that date
No manual rate lookup. No "which rate do we use?" debates. Everything converts and totals in your chosen currency.
Rounding: Practical for Cash Settlements
When you're paying in cash, pennies and odd cents get tedious. WariSaku lets you round settlement amounts to your preferred unit:
- Nearest $1 — Clean and easy for digital payments
- Nearest $5 — Good for cash-heavy groups
- Nearest $10 — Practical for large groups or big-ticket events
Change this setting in the group settings before finalizing settlement.
Frequently Asked Questions
Q: What if I lose the group URL?
Open WariSaku and go to Group List. Your recently accessed groups appear there, linked to your browser's local storage. If you accessed the group on a different device or cleared your browser cache, ask another member to resend you the link.
Q: Can I manage multiple groups at the same time?
Yes. Each group is completely independent. You might have one for a trip, another for regular dinners, and one for shared household expenses — all accessible from the Group List screen.
Q: Can I delete a transaction I entered by mistake?
Yes. Deleted transactions are kept in your history and can be restored if needed. Mistakes are easy to fix, so don't hesitate to log things in the moment.
Q: Which 16 currencies are supported?
Sixteen major currencies, including JPY, USD, EUR, and KRW — covering Japan, North America, Europe, and most of Asia-Pacific. The full list is visible in the group's currency settings.
Wrap-Up
The whole workflow is: create a group → share the link → log payments → check settlement. That's it. The advanced features are there when you need them — nothing has to be learned upfront.
Next time a dinner or trip lands on the calendar, create the group and drop the URL in the chat before anyone meets up. The "how are we splitting this?" conversation simply never happens.
