WhatDoIO is the ultimate group expense tracker and bill splitter designed to make settling debts completely stress-free. Whether you are traveling the world with friends, sharing household bills with roommates, or organizing a group event, WhatDoIO takes the math out of who owes what.

Core Features:

• Split Bills Any Way: Split bills evenly, unequally, or by shares with just a few taps. • Smart Debt Simplification: Our advanced settlement solver automatically calculates the absolute minimum number of payments needed to settle all group debts. • Real-Time Sync & Security: Instantly update group balances across all devices and sign in securely with Face ID or Touch ID.

What Makes WhatDoIO Different:

• Co-Paid Expenses: Unlike other apps that only allow one person to pay for a bill, WhatDoIO lets you log expenses paid by multiple people simultaneously (e.g., co-buying groceries or booking flights) and handles the math automatically. • Verified Settle-Ups: Keep your ledger honest. When a member logs a payment to settle a debt, the transaction remains pending and does not alter balances until the recipient confirms receipt of the funds. This prevents "phantom payments" and ensures absolute trust. • Anti-Tamper Audit Trail: Say goodbye to silent balance changes. If a roommate edits an old receipt or deletes a bill, WhatDoIO highlights the change, logs who did it, and displays the exact revision history. • Locked Exchange Rates: Exchange rates are permanently frozen the exact second you log a bill. Your group balances stay immune to market volatility and currency swings. • Your Spend vs. Your Share: Ditch the mental estimations. A color-coded visual dashboard immediately contrasts your total out-of-pocket spend against your actual fair share, showing you exactly where you stand. • Direct-Pay Preference: Opt out of automated debt routing. Individually choose to settle directly with the person you actually owe, while other group members continue using simplification. • Works Offline (Logged-in): Losing signal won't halt your ledger. As long as you are already signed in to your active session, you can queue new transactions offline. They sync automatically the second you reconnect.

Say goodbye to spreadsheets, calculators, and awkward conversations about money. Download WhatDoIO today and split bills the smart way!