Split Bill Wisely

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Inspiration

Splitting bills with friends is always messy — from “who owes what?” to “just send me your UPI ID.” We wanted a lightweight way to make settling bills fun, fast, and less awkward.

What it does

• Lets users create/join a group and split bills easily.
• Handles authentication and user management via Clerk.
• Tracks balances per person in the group.

How we built it

• Frontend: Next.js App Router with Tailwind for a sleek dark UI.
• Backend: MongoDB + Mongoose for user and expense data.
• Auth: Clerk for sign-in/sign-up, JWTs & sessions.
• Extras: UPI deeplink format (upi://pay?pa=…&pn=…&am=…) integrated into the flow.

Challenges we ran into

• Integration of clerk with mongodb took a lot time and was not easy
• Aiming for a clean ui was tough in such small amount of time
• Designing of the models and how it should work took effort and it has a shape for the future updates

Accomplishments that we're proud of

• A smooth auth + protected route system using Clerk.
• Clean, intuitive UI that feels like a real app.

What we learned

• How to integrate Clerk seamlessly into Next.js.
• Proper user session handling and protected routes.
• How to mange complex db

What's next for Split Bill Wisely

• Spin Wheel with UPI deeplinks — let chance decide who pays.
• Visual balance charts.
• PWA support so it feels like a native app.
• Notifications when someone hasn’t paid yet.

Built With

• clerk
• mongodb
• nextjs
• radui