BillGuard brings together advanced data-mining technology with the power of crowdsourcing to provide the world’s first online service that detects and flags suspicious charges on consumer credit and debit card bills.

BillGuard is driven by the collective knowledge of its users along with millions of people posting billing complaints online. The personal finance security service—which is completely free for consumers—alerts cardholders to hidden charges, billing errors, misleading subscriptions, scams and fraud on their credit and debit cards.