Track who owes whom. Settle up outside.
Biller keeps the books for trips, roommates, and dinners: who paid what, who owes whom, and an AI explainer that turns a confusing, uneven split into a sentence anyone can read. No money ever moves through Biller.
Built for groups
Trips, roommates, dinners
AI explainer
Uneven splits in plain English
No money moves
Settle up outside the app
Per-user scoped
Your data stays yours
The honest way to split a bill
Biller is a record-keeping tool, not a payment app. It does the math, keeps the receipts, and explains itself when a split looks weird. The settling up is yours to do however you already do it.
Splits that match real life
Equally, by exact amounts, by percentages, by shares, or by adjustments. Biller does the math so a lopsided dinner where one person skipped the wine still comes out fair.
AI explains the awkward split
Tap "Explain this for me" on any expense and Biller writes a short, plain-English explanation of who owes what and why. No more squinting at a receipt trying to reverse-engineer the math.
A ledger, not a wallet
Biller tracks balances and lets you mark a debt settled. The money itself moves wherever you already settle up: cash, Venmo, a bank transfer. Biller never holds or moves a cent.
Three steps, no spreadsheet
You used to do this with a notes app and a calculator. Biller keeps the running total so nobody has to be the group accountant.
Make a group
Start a group for the trip, the apartment, or the dinner. Add people from your contacts or by scanning their profile QR code.
Add expenses
Log what was spent, who paid, and how it splits. Attach a receipt photo if you want a record. Biller keeps a running balance per person.
Settle up
See exactly who owes whom. Pay each other back however you normally do, then tap to mark the debt settled. The ledger zeroes out.
Everything a group needs, nothing it doesn’t
Groups and balances
A net summary up top (what you’re owed vs what you owe), per-pair balances, and totals by category and by person. Archive a trip when it’s done.
Receipt photos
Attach a photo to any expense so there’s a record of what the number was. One photo per expense on the free tier, up to ten with Pro.
Activity and notifications
A feed of expenses and settlements across all your groups, plus optional notifications when someone adds an expense or marks a debt settled.
Categories and exports
Nine default categories out of the box, custom categories with Pro, and CSV or PDF exports of a group when you need the paper trail.
The AI explainer
Three free explanations a month, unlimited with Pro. It reads the actual split and writes two or three honest sentences. Always tap “view the math” to check it.
Private by default
A group is only visible to its members. Security rules scope every read and write to your account. Biller is not a payment processor and never sees your money.
Stop being the group accountant.
Biller is launching soon on iPhone. Clean, calm, and built so a messy group bill stops being your problem.
App Store
iPhone only · iOS 17 or later