🍺 SplitWeiss

Don't split wise. Split Weiss.

SplitWeiss is a no-login expense-sharing app built for groups — trips, dinners, house shares, festivals. Add expenses in any currency and SplitWeiss figures out the simplest way for everyone to settle up.

Features

• Flexible splitting — split by fixed amount or percentage, per person
• Multi-currency — add expenses in any currency, settled in the group's base currency with live exchange rates
• Smart settlement — greedy algorithm minimizes the number of payments needed to clear all debts
• No sign-up required — share a group link and anyone with it can join instantly

Stack

• Next.js 15 — App Router, Server Actions
• Prisma 6 + Neon PostgreSQL
• React Query — client-side data fetching
• React Hook Form + Zod — form validation
• Decimal.js — precise financial arithmetic
• shadcn/ui + Tailwind CSS 4

Getting Started

npm install
cp .env.example .env.local  # fill in your DATABASE_URL
npx prisma db push
npm run dev

Open http://localhost:3000.

Scripts

npm run dev       # Start development server
npm run build     # Production build
npm run lint      # Run ESLint

npx prisma db push        # Push schema.prisma to the database
npx prisma generate       # Regenerate Prisma client
npx prisma studio         # Open Prisma Studio GUI