Bill not adding up? Let's sort it.

No. This is the single most important thing about Biller. No money ever moves through the app. Biller is a record-keeping tool: it tracks who owes whom. When you mark a debt as settled, you're only updating the ledger. The actual money you exchange yourselves, outside the app, by cash, Venmo, bank transfer, or however you already settle up. Biller never holds, sends, or receives funds, and it never asks for your bank or card details.

Almost always it's the split method. An expense split equally divides evenly, but one split by amounts, percentages, shares, or adjustments can land differently, for example if someone didn't have a drink. Open the expense and tap "view the math" to see the exact per-person breakdown. If it still looks wrong, whoever entered the expense can edit it, and the balances recompute.

When you tap "Explain this for me," Biller sends the expense (description, amount, who paid, the participants, and the split), the group name, and your first name to OpenAI's gpt-4o-mini model through a secure Cloud Function, and gets back a short plain-English explanation. The math itself is computed by Biller, not the AI; the explainer just describes it. The wording is best-effort and can occasionally be off, so there's always a "view the math" link to check the real numbers. If the explanation and the math ever disagree, trust the math.

Edit or delete it. Open the expense from the group's Expenses tab and change the amount, who paid, the participants, or the split. The group's balances recompute automatically once the change syncs. There's no need to delete and re-create from scratch.

Up to 3 active groups, unlimited members and expenses in each, splitting equally or by exact amounts, 1 receipt photo per expense, and 3 AI explanations per calendar month. The 9 default categories and the light theme are included.

Three options in one subscription group: $1.99 per week, $4.99 per month, or $29.99 per year. The monthly and yearly tiers include a 7-day free trial; the weekly tier does not. All three unlock the same Pro features: unlimited active groups, all split methods (percentages, shares, adjustments), unlimited AI explanations, up to 10 receipt photos per expense, custom categories, dark theme, CSV and PDF export, and priority email support. Prices may vary slightly by country, since Apple sets local pricing.

On iPhone, open Settings, tap your name at the top, choose Subscriptions, then Biller. From there you can switch tiers or cancel. Apple handles billing, so refund requests also go through Apple at reportaproblem.apple.com. Cancelling stops the next renewal; you keep Pro until the current period ends.

Your groups and expenses are stored in Firebase and are visible only to the members of each group. Expense details and your first name go to OpenAI only at the moment you ask for an explanation, and OpenAI doesn't use API submissions to train its models. RevenueCat sees your subscription status, and PostHog gets anonymous usage events (never the content of your expenses), which you can switch off in Settings. We don't run ads, don't sell your data, and don't track you across other apps.

No, it's optional. If you allow contacts access, Biller can read your phone contacts so you can pick people quickly when building a group. Those contacts stay on your device and aren't uploaded unless you explicitly save one into your in-app contacts list. You can also add people manually or by scanning their profile QR code.

Open Settings inside the app, go to Security, tap Delete account, and confirm. There's a 24-hour grace period in case you change your mind. After that, a Cloud Function removes your auth record, user document, contacts, notifications, and AI records. Expenses and settlements you shared in a group stay (they belong to the other members too) and your name is replaced with "Former member."

Not yet. Biller is iPhone only at launch and requires iOS 17 or later. An Android version is planned for a later phase.

Apple handles every subscription transaction. For refunds, use reportaproblem.apple.com. If your subscription state looks wrong (showing as expired right after you paid, for example), email support@moetalaat.com with your receipt and we'll sort it out.