Ramp

Ramp is our pick here because it's the rare fraud-relevant tool that's genuinely free and genuinely useful. The core platform, corporate cards, expense management, and bill pay, costs $0 per user, and the anti-fraud and anti-waste controls are built into it rather than sold as an add-on. For an SMB that means the tool that catches a duplicate invoice, an out-of-policy expense, or a payment that doesn't add up is the same tool you're already using to move the money.

The controls do real work. Ramp's AI reviews 100% of expenses against your policy and surfaces only the exceptions, routes approvals automatically, and flags duplicates, including the duplicate subscriptions you forgot you were paying for. On the AP side it captures invoices with OCR, codes them, routes approvals, and pays, with duplicate-invoice detection sitting in the flow. It isn't a forensic audit engine like AppZen or MindBridge; it's real-time spend control that happens to close the most common AP-fraud gaps for a company that doesn't have an internal audit team.

Two honest caveats. Ramp is US-first: it issues cards in a number of countries, but the spend and AP product is built around US businesses and banking. And 'free' is real for the software because Ramp earns on card interchange and optional paid tiers, so its incentive is to run more of your spend through it, worth understanding before you consolidate everything onto it. It's also a spend platform, not a payroll or vendor-identity tool, so pair it with Middesk or Trustpair if entity or bank-account verification is your actual exposure. For the SMB looking for one move to tighten expense and AP fraud at no software cost, this is the first stop.