Rex
Rex · Business
Rex is an AI operations partner for order-to-cash work. It connects to your existing finance stack, then runs accounts receivable agents that chase open invoices, triage disputes, submit documents to supplier portals, and apply payments. This is AI accounts receivable automation that does the work, not just reports on it. Your finance team approves the exceptions and keeps strategic accounts. Rex is built for enterprise AR teams rather than solo users, and it's sold as a managed service priced against the cost of running receivables.
About Rex
What Is Rex
Rex is an AI agent platform aimed at the cash side of finance. Instead of stopping at dashboards and insights, its agents take actions across systems: they email customers about overdue invoices, log in to supplier portals and upload documents, and reconcile payments as they arrive. The company pitches it as an operations partner, not a reporting tool. Somebody has to do the follow-up work, and Rex does it around the clock.
The problem it targets is capacity, not strategy. Most CFOs already know what improves cash: tighter payment terms, faster collections, and contracts that actually get enforced. What they lack is the headcount to work the long tail of low-value accounts and small balances that never get attention. Rex exists to absorb that grind. Someone has to do it.
Rex is a managed service, not self-serve software, which means there's no free sandbox, no public product API, and no published price list you can check before you talk to someone. Onboarding runs through the Rex team, who scope the environment, wire up your systems, and agree on operating rules with your operators. Implementation is usually live in under two weeks, but you have to talk to a human first.
Getting Started
- Book a walkthrough with the Rex team and describe your current order-to-cash workflow.
- Let Rex scope the environment and connect it to your finance stack, including ERP and portal accounts.
- Agree on operating procedures and guardrails with your finance operators, covering what agents can do unsupervised.
- Go live once systems are connected, typically within two weeks, and route exceptions to your team for approval.
- Track results against your cash metrics as agents handle collections, disputes, and portal submissions.
Product Information
A quick look at Rex's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Enterprise AR and collections teams
- CFOs and finance leaders chasing working capital
- Shared services centers handling high invoice volume
Tasks
- Chasing overdue invoices
- Supplier portal submissions
- Dispute triage
- Cash application
- Invoice collections and billing audits
Scenarios
- You know what would free up cash but nobody has time to enforce it
- Renewal or term renegotiation at scale
- Unpredictable payment timing
Key features
Always-On Accounts Receivable Agents
This AR automation platform works continuously across your AR book instead of waiting for someone to open a spreadsheet. They handle execution end-to-end, from sending follow-up emails to validating purchase orders, and your team steps in only when judgment is needed. The point is that the routine work runs whether anyone is watching or not. Who chases the invoice nobody remembers? Rex does.
Coverage of 40+ Supplier Portals
Rex logs in to more than 40 supplier portals, including Coupa, Ariba, and Bill.com, plus custom portals it learns during setup. It uploads invoices, validates submissions, and flags anything that needs a human decision. Anyone who has spent a week uploading the same invoice PDF to a dozen customer portals knows how much that matters. It adds up fast.
Collections That Match Actual Payment Behavior
Most collections tools work from contract terms. Rex watches how each customer really pays, then personalizes the timing and tone of its reminders and escalates with context when something stalls. That's a meaningful difference when your biggest customer always pays late but always pays.
Payment Forecasting Per Invoice
Rex predicts when cash will land for each invoice based on customer behavior rather than stated terms. When a delay looks likely, it triggers proactive collections before the money is overdue. Finance teams get a forward view instead of a rearview mirror, which is where DSO reduction actually starts.
Hidden Revenue and Billing Audits
Agents can run a multi-month contract audit in minutes and take action on what they find, including pricing discrepancies, uncollected fees, and billing errors spread across thousands of customers. This is the kind of work no one assigns to an analyst because it never quite justifies the hours.
Runs on Your Existing Finance Stack
Rex connects to systems you already run, including Oracle NetSuite, SAP, Microsoft Dynamics, Workday, and Oracle Fusion. There's no migration, no rip-and-replace, and no consultants rebuilding your accounting setup. Rollout usually happens in under two weeks.
Enterprise Security and Audit Trails
The platform ships with role-based access control, audit logs, and AES-256 encryption, and the company says it's SOC2 Type I compliant with ISO27001 monitoring. Every agent action leaves a decision trace, which is what makes delegating real finance work to software something a CFO can sign off on.
Pros and cons
Pros
- Agents execute work rather than just surfacing it, so collections and portal uploads actually get done instead of landing on someone's to-do list.
- No migration required, and Rex plugs into Oracle NetSuite, SAP, Microsoft Dynamics, Workday, and Oracle Fusion.
- Decision traces and audit logs on agent actions give finance teams a clear record of what happened and why.
- Rollout is usually measured in days, with the company citing live deployments in under two weeks.
Cons
- No self-serve signup or free sandbox, so you can't test Rex without booking a call, which slows any real evaluation.
- Pricing is opaque: it's custom and benchmarked against your receivables operating cost, so budgeting takes a conversation.
- There's no public product API, which rules out teams that want to wire Rex into their own tooling.
- Anthropic-style autonomy means it's aimed at enterprises with established processes; smaller teams with messy AR workflows may not get much out of it.
Frequently asked questions
Rex runs order-to-cash operations with AI agents. They handle invoice collections, dispute triage, supplier portal submissions, cash application, and payment forecasting on top of your existing finance systems. Your team reviews exceptions while agents do the routine work. It's an operations layer, not a reporting dashboard.
Related content
Explore related tools, skills, and articles for Rex.
Rex Alternatives
Knocket
Knocket (Tencent RTC team) · Productivity · Business · ChatbotKnocket is a free live chat and contact page tool that lets visitors message you from your website, app, or a shareable link, with every reply handled from Telegram or one inbox.
shippedit.me
Krawlup · Marketing · Businessshippedit.me now redirects to Krawlup, a web platform that audits SEO, AEO and page speed every week, then hands the fixes to AI coding agents over MCP.
Ayven
Alknoma · Productivity · BusinessAyven is an AI control centre by Alknoma that turns a plain-language goal into a dated plan, hands the work to your people and AI agents, and asks for your approval only when the call is yours.