Rex - 2026 Pricing, Features, Reviews & Alternatives

Rex is a managed AI service for accounts receivable (AR) and order-to-cash teams.

Unlike traditional AR automation software, which gives finance teams another system to configure and operate, Rex takes responsibility for the work itself. Its AI agents carry out the routine, high-volume tasks that consume most of an AR team's day: collections outreach and dunning sequences, invoice delivery, payment reminders and follow-up, and triage of the shared AR inbox, including responses to common customer requests such as invoice copies and billing questions.

The service is set up around a company's existing collections policies, payment terms, and tone of voice. Agents execute those policies continuously across the whole ledger, and the Rex team manages quality and performance over time. Anything that needs human judgment (a disputed invoice, an at-risk account, a payment plan request) is escalated to the finance team with full context attached. Rex helps teams work exceptions; it never replaces people. Policy, approvals, and customer relationships stay with the team.

Rex operates inside the existing finance stack rather than requiring teams to change how they work. It connects to ERP systems such as NetSuite, CRM systems such as Salesforce, and email and messaging tools such as Gmail and Slack, keeping invoice data, customer records, and communications consistent with the systems of record. Every action an agent takes is logged and reviewable, and escalation rules determine what requires sign-off before it goes out.

Rex serves accounts receivable, collections, credit, and order-to-cash functions at B2B companies. It addresses the same problem space as AR automation, collections management, and invoice-to-cash software, delivered as a managed AI service: an outcome (receivables worked every day) rather than another tool the team has to drive.