Smart Expense Splitter
Group expenses without the awkward conversations.
The Problem
Every group trip, every dinner with friends, every shared house ends the same way: someone Venmo-requesting, others forgetting who paid what, and awkward "you still owe me $23" conversations weeks later. Splitwise exists but feels dated and bloated. People want something simpler.
The Solution
A clean, modern expense splitter that creates a group, logs expenses, and calculates the minimum number of payments needed to settle up. Integrates with Venmo/PayPal for one-tap settlement. Works great for trips, roommates, and regular dinner groups.
How it works:
Create group
Invite friends via link
Log expenses
Who paid, who's involved
Settle up
Optimized payments via Venmo
Market Research
Group expense tracking is an evergreen category with one dominant incumbent and a long tail of me-toos. The opportunity is not inventing a new category—it is modern UX, faster settlement, and niche modes (group travel, roommates, couples) that the incumbent has underserved for nearly a decade.
- Splitwise reports 50M+ downloads and last raised on a $1B+ valuation; Pro tier at $4/mo is the market's price anchor.
- Global outbound tourism has fully recovered past 2019 levels (UNWTO 2024)—group trips are the highest-intent use case for a splitter.
- Zelle processed $1T+ in P2P payments in 2023 and Venmo passed $270B in annual TPV—settlement rails are solved; splitting UX is not.
- Gen Z and Millennials split 3+ recurring expenses with housemates on average (Zillow / Pew housing surveys); roommate is a sticky, monthly use case.
Competitive Landscape
Splitwise owns the brand; Venmo owns the default. Everyone else fights for niche use cases. Your opening is modern UX plus a specific mode the incumbent neglects—group travel receipt parsing, multi-currency, or a roommate-first recurring bills layout.
Splitwise
Category king. Works, but UI is a decade old, Pro tier feels nickel-and-dimed, and the travel-specific workflow (multi-currency, receipt photos, exchange rates) still requires workarounds.
Free with ads → $4/mo Pro (no ads, receipts, currency conversion)
Tricount
Euro-popular, travel-first. Slick enough on the app, but no dominant US presence and the web experience is weak—opening for a travel splitter with a tight trip-pass offer.
Free with ads → €2.99/mo Premium
Settle Up
Clean, minimal, indie. Good multi-currency handling but weaker viral loops—nobody talks about Settle Up the way they talk about Splitwise. Product is fine; distribution is the gap.
Free → $2.99/mo or $14.99/yr Premium
Venmo / Cash App
The “just Venmo me” default. Kills intent once per transaction but has no group math, no history per trip, no recurring bill logic. Co-existence play: export settled balances as a Venmo / Cash App request link.
Free for P2P; no splitting or group tracking UX
Your Opportunity
Ship a modern, mobile-first PWA that nails one niche hard—group travel with OCR receipt capture and live multi-currency, or a roommate-first recurring bills home—then widen. Splitwise’s stagnation and Venmo’s non-answer are both the opening.
Business Model
Freemium subscription priced at the category floor, plus a one-time Trip Pass that captures the high-intent travel moment without asking tourists to start a monthly subscription. Free tier seeds viral group invites; Pro monetizes housemates and repeat trip organizers.
Free
$0
1 active group, up to 5 members, basic split math, Venmo/Cash App hand-off
Pro
$3.99/mo
Unlimited groups, recurring expenses, multi-currency, receipt OCR, CSV export
Trip Pass
$9.99 once
One trip, unlimited members, full feature set for 30 days—no subscription
Unit Economics (illustrative)
Target CAC
$2–6
Viral k-factor
1.8–2.4
Pro conversion
3–5%
Trip Pass attach
8–12%
Recommended Tech Stack
PWA-first is the call—travelers on patchy hotel Wi-Fi need offline expense entry that syncs later. Next.js covers marketing + app + API in one deploy; Supabase handles auth, Postgres, and Realtime for live group balance updates; OCR via GPT-4o Vision keeps receipt capture a single API call.
Next.js 14 PWA + TypeScript
App Router, installable PWA with service worker for offline expense entry. IndexedDB queue drains to Postgres on reconnect.
Supabase
Auth + Postgres for groups/members/expenses, Realtime for live balance updates, Storage for receipt images, RLS per group membership.
GPT-4o Vision (receipts)
Single API call parses receipt photo into merchant, total, line items, and currency. Gate behind Pro + Trip Pass to keep margin positive.
Stripe
Checkout + Billing Portal for Pro subscriptions; one-off Payment Links for Trip Pass. Webhook-driven entitlement sync.
Open Exchange Rates
Daily FX rates for multi-currency trips; store rate-at-entry on the expense so historical balances don’t drift.
Resend
Trip summary emails, recurring-bill reminders, “you owe / you’re owed” nudges with one-click settle links.
AI Prompts to Build This
Copy and paste these into Claude, Cursor, or your favorite AI tool.
1. Project Setup
Create a Next.js PWA for an Expense Splitter app. Features: - Landing page with "Start a Group" CTA - Create group: name, invite link generation - Group dashboard: members, expenses list, balance summary - Add expense modal: amount, description, who paid, split type (equal/exact/percentage) - Each member sees their balance (owed/owing) Use Supabase auth (magic link for easy onboarding) and database. Make it installable as PWA for mobile.
2. Core Feature
Implement the settlement optimization algorithm: 1. Calculate net balance for each person (total paid - total owed) 2. People with positive balance are owed money; negative balance owe money 3. Implement minimum transaction algorithm: - Sort creditors and debtors - Match largest debtor with largest creditor - Settle minimum of both amounts - Repeat until all settled 4. Display settlement plan: "Alice pays Bob $50" etc. This minimizes total number of transactions needed.
3. Payment Integration
Add payment links for settlement: - Generate Venmo deep links: venmo://paycharge?txn=pay&recipients={username}&amount={amount}¬e={description} - Generate PayPal.me links: paypal.me/{username}/{amount} - Add "Mark as Paid" button to manually record settlements - Send push notification when someone marks payment complete - Keep history of all settlements Allow users to save their Venmo/PayPal username in settings.
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