What REX AI LTD does

Rex (REX AI LTD) is an AI-native accounts receivable (AR) automation platform that sells to enterprise finance and AR teams. The product replaces manual and rules-based collections workflows with an agentic AI system that operates on a perceive-decide-act loop, ingesting customer ERP, CRM, banking, and payment portal data to autonomously chase invoices, handle disputes, and resolve exceptions. The platform is built on Anthropic Claude accessed through AWS Bedrock, with a multi-tenant architecture and per-tenant data isolation, and is augmented by human-in-the-loop safety controls for high-judgment actions.

The product is delivered as a multi-module SaaS suite comprising Inbox (collections workspace), Agent (the autonomous AR agent), Customer Portals (buyer-facing payment experiences), Studio (workflow configuration), and Compass (analytics and reporting). Rex employs outcome-based and SLA-based pricing, aligning vendor economics with collected receivables rather than seat counts or flat subscriptions. The company reports 342 customers on its live dashboard with $18.4M in receivables worked, and names Synthesia as a publicly disclosed enterprise customer.

Rex is a Y Combinator Summer 2026 (S26) company, won first place in the Vercel AI Accelerator (out of 2,500 applicants), and is pursuing SOC 2 Type II certification alongside GDPR compliance. The company is incorporated in England and Wales (London) with operational presence in San Francisco, and is currently at a 1–10 employee headcount consistent with a founder-stage team.

Name

REX AI LTD

Legal name

Rex AI Ltd.

Website

https://rex.inc

Company type

Private

Founded year

2026

Operating status

Operating

Headcount range

1–10 employees

Short description

Rex is an AI-native accounts receivable automation platform that uses an agentic system (built on Anthropic Claude via AWS Bedrock) to autonomously chase invoices, handle disputes, and process payments for enterprise finance and AR teams.

Ownership category

akta.pro rank

Product category

Accounts Receivable Automation Software

NAICS

Software Publishers (5132), Computer Systems Design and Related Services (54151)

SIC

Services-Prepackaged Software (7372), Services-Computer Programming, Data Processing, Etc. (7370)

akta.pro primary industry

Agents & Autonomous Workflows (Tool Use, Planning, Multi-Agent) (HDAAACAF)

akta.pro secondary industry

Robotic Process Automation (RPA) & Hyperautomation Platforms (HDAEAKAF)

Keywords

• Accounts receivable automation
• Order-to-cash AI
• Agentic AI platform
• AR collections automation
• Cash application software

Headquarters

HQ city

San Francisco

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Personnel, Infrastructure, Marketing or Sales, Operations

Revenue model

1. AI Order-to-Cash SaaS Subscription: Rex is delivered as a multi-tenant SaaS product with outcome and SLA-based pricing. Customers pay subscription fees associated with their subscription plan and order form. The platform automates invoice processing, collections workflows, payment reconciliation, and related financial operations continuously, with no migration required and go-live in days.
2. Outcome and SLA-Based Pricing: Pricing is structured around outcomes achieved and service levels met, rather than headcount or time-and-materials. This aligns Rex's value delivery with customer payment, positioning the offering as a performance-driven engagement rather than a traditional per-seat SaaS license.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Rex is an AI-native accounts receivable automation platform that deploys autonomous AI agents to continuously work a customer's order-to-cash process across their existing ERP, CRM, email, and vendor portal systems. The platform automates inbox triage, invoice submission to 130+ customer AP portals, payment follow-ups, dispute resolution, and cash application against enterprise SLAs without replacing existing systems. It is delivered as a multi-tenant SaaS product with full tenant isolation and outcome/SLA-based enterprise subscription pricing.

Product overview

Rex is an AI-native accounts receivable automation platform delivered as a multi-tenant SaaS product. The platform is architected as a unified core system (Rex) augmented by specialized modules: Inbox (AI-powered email triage and AR communication management), Customer Portals (autonomous portal operations across 130+ AP portals including Coupa, SAP Ariba, and Tungsten), Agent (the core autonomous agent that works every invoice, account, and customer touchpoint continuously), Studio (a policy configuration layer governing agent behavior), and Compass (real-time AR visibility and reporting dashboard). These modules share access to the customer's connected ERP, CRM, email, and portal systems and operate as an integrated system — the Agent draws context from Inbox and Portals data, and Compass provides the live reporting layer across all functions. The platform does not replace existing systems but operates over them via native integrations.

Differentiator

Problem solved

Functional benefit

Products and services

• Rex (Core Platform) Multi-tenant SaaS platform that deploys autonomous AI agents to run a customer's order-to-cash operations continuously. The agents read and write across the customer's ERP, CRM, email, and 130+ customer AP portals to handle inbox triage, invoice submission, collections follow-ups, dispute routing, and cash application, with human-in-the-loop approval gates, decision traces, and full tenant isolation.
• Compass Real-time visibility and reporting dashboard for the Rex platform that surfaces live AR activity, SLA status, blocked cash, open exceptions, daily summaries, and account-level queries (e.g., open disputes over threshold, DSO trend, customers gone quiet, changed payment terms) across the entire receivables book.

Quantifiable outcome

• 12-day reduction in DSO (baseline dependent)
• +5 more outcomes

Named customers1 record

Segments1 record

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration23 records

AI capability8 records

Feature7 records

Partnerships

Three partnerships are on record, tiered core and minor.

• Anthropic (via AWS Bedrock)coreTechnology or IntegrationRex uses Anthropic's Claude large language models for all LLM inference, accessed via AWS Bedrock. This is the core AI technology underpinning Rex's agentic AR platform. All inference runs server-side within Rex's infrastructure with tenant isolation. AWS Bedrock operates under zero data retention by default — prompts and completions are not stored or used for model training.
• AWS (Amazon Web Services)coreTechnology or IntegrationRex's infrastructure is hosted on AWS with VPC isolation, network access controls, and continuous monitoring. AWS provides the cloud foundation for the multi-tenant SaaS platform, including the Bedrock service through which Anthropic Claude models are accessed.
• SynthesiaminorOthersSynthesia is featured as a customer case study on Rex's website. The case study describes how Synthesia's finance team runs AR operations with Rex, with the AR inbox, 30+ customer portals, and collections handled by Rex with no added headcount. This is a customer reference relationship.

Scale indicators12 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Stampli: Stampli is an AP automation and invoice management platform with collaborative workflows and AI-powered invoice handling. While focused on AP rather than AR, it competes for adjacent finance operations budget and demonstrates the broader automation category Rex is part of.
• Bill.com: Bill.com is a broad financial operations platform spanning AP, AR, spend management, and workflows for SMBs and mid-market. While its AR capabilities are less agentic than Rex's, it competes for the same CFO/AR leader budget and is a public-market incumbent to monitor.
• Glean: Glean is an enterprise AI search and work assistant platform that integrates deeply with ERPs, CRMs, and document stores. While not directly in AR, its agentic enterprise AI approach over existing systems parallels Rex's architecture and signals the broader competitive set in enterprise AI agents.

Emerging players

• Tabs: Tabs is an AI-native AR automation platform targeting B2B SaaS and recurring revenue businesses. It uses AI agents for invoice generation, collections, and revenue recognition, making it a closely comparable emerging player to Rex in the agentic AI for finance space.
• Numeric: Numeric is an AI-powered accounting and close management platform focused on enterprise finance teams. While its core is the month-end close, it represents the broader AI-for-accountants category that intersects with Rex's enterprise finance buyer.

Direct peers

• Emagia: Emagia is an AI-based order-to-cash platform offering invoice automation, collections, cash application, and credit/risk analytics. It competes with Rex on AI-led AR operations and serves a similar enterprise finance buyer.
• HighRadius: HighRadius is a leading AI-powered order-to-cash and treasury management platform serving enterprise finance teams. It directly competes with Rex in AR automation, cash application, collections, deductions, and ERP-integrated workflows, and is the most established comparable in the space.
• Versapay: Versapay provides AR automation and collaborative invoice-to-cash workflows, connecting billers and buyers through a shared network. It is a direct competitor to Rex on B2B AR automation, collections, and dispute resolution for enterprise finance teams.
• YayPay (Quadient): YayPay, now part of Quadient, is a SaaS AR automation and collections platform. It overlaps with Rex on automated invoice reminders, collections workflows, and ERP-integrated AR for mid-market and enterprise customers.
• Tesorio: Tesorio is an AI-driven cash flow and AR automation platform targeting mid-market and enterprise CFOs. It overlaps directly with Rex on predictive collections, automated follow-up, and ERP-integrated AR workflows, with similar horizontal positioning toward finance leaders.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/rexdotinc
• LinkedInlinkedin.com/company/rex-ai-inc

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds2 records

Investors1 record

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about REX AI LTD