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With AI, Everyone is a Dev. EveryDev.ai © 2026
    1. Home
    2. Developers
    3. Rex AI, Inc.

    Rex AI, Inc.

    Rex is an AI-native service for enterprise order-to-cash that replaces people-heavy manual operations with AI agents.

    Visit Website

    At a Glance

    1Tool Listed
    1Product
    6Capabilities
    Discussions
    San Francisco, CaliforniaHeadquarters
    2026Est.
    2Employees
    Focus Areas
    Autonomous Systems
    Workflow Automation
    Business Accounting
    Connect
    Latest News
    Rex joins Y Combinator Summer 2026 batchJul 1, 2026
    Rex wins the Vercel AI Accelerator, selected #1 of 2,500 teamsJun 1, 2026
    Markets
    • Enterprise finance teams
    • Pre-IPO technology companies
    • Global enterprises

    AI Tools by Rex AI, Inc.

    (1)
    View Rex
    Rex tool icon

    Rex

    AI Agents for AR Operations

    Autonomous SystemsWorkflow AutomationBusiness Accounting

    Discussions

    No discussions yet

    Be the first to start a discussion about Rex AI, Inc.

    Latest News

    07/01/2026

    Rex joins Y Combinator Summer 2026 batch

    rex.inc
    06/01/2026

    Rex wins the Vercel AI Accelerator, selected #1 of 2,500 teams

    rex.inc

    Products & Services

    1
    Rex
    2026

    An AI-native agentic finance platform for enterprise order-to-cash (O2C). It uses AI agents to automate manual tasks like collections, reconciliation, and portal uploads.

    Market Position

    Rex positions itself as an 'agentic' finance platform that handles the judgment calls and exceptions that traditional rule-based automation (ERPs/RPA) cannot, requiring no knowledge transfer or migration.

    Leadership

    Founders

    MK

    Merlin Kafka

    Co-founder & CEO. Previously CPO at Sequence (a16z-backed). Former lead product at Tessian (Sequoia, acquired by Proofpoint). Studied industrial engineering at Cambridge.

    LB

    Lewis Blackwood

    Co-founder & CTO. Led engineering at Sequence as a founding engineer. Previously early engineer at GoCardless (YC S11) and founder of Personably (GFC-backed). Studied economics at Cambridge.

    Executive Team

    MK

    Merlin Kafka

    Co-founder & CEO

    Deep domain expertise in order-to-cash and AR workflows; former CPO at Sequence.

    LB

    Lewis Blackwood

    Co-founder & CTO

    Experienced engineering leader; former founding engineer at Sequence and early team at GoCardless.

    Founding Story

    Founded by former Sequence leaders who saw firsthand that enterprise order-to-cash still runs on manual labor because rule-based automation fails at handling exceptions and judgment calls. They built Rex to provide agentic finance automation that connects to existing stacks without migration.

    Business Model

    Revenue Model

    SaaS / Subscription (API usage, platform subscriptions)

    Pricing Tiers

    Enterprise

    Custom pricing for global enterprises and pre-IPO tech companies

    Private

    Target Markets

    Industries & Segments
    • Enterprise finance teams
    • Pre-IPO technology companies
    • Global enterprises
    Use Cases
    • Order-to-cash automation
    • Accounts Receivable (AR) management
    • Invoice reconciliation
    • Supplier portal management
    • Triage of AP/AR emails
    Notable Customers
    • Synthesia
    • Uber
    • OpenAI
    • Vercel

    Quick Facts

    Headquarters
    San Francisco, California
    Founded
    2026
    Entity Type
    Inc.
    Employees
    2
    Total Funding
    500000+
    Investors
    Y Combinator, Vercel Ventures
    Office Locations
    San Francisco
    London

    Funding History

    Pre-Seed / Accelerator
    June 2026
    Vercel
    Seed (YC S26)500000
    July 2026
    Y Combinator

    History & Milestones

    2026

    Company founded by Merlin Kafka and Lewis Blackwood.

    June 2026

    Selected as the #1 winner of the Vercel AI Accelerator out of 2,500 teams.

    July 2026

    Joined Y Combinator as part of the Summer 2026 batch (S26).

    Key Capabilities

    6
    AI agents for collections and reconciliation
    Automated portal uploads (e.g., Coupa, Taulia)
    Inbox auto-triage (90%+ rate)
    Real-time visibility across AR books
    Auditable governance layer
    Connection to existing ERPs (NetSuite, SAP, etc.)

    Integrations & Partnerships

    Platform Integrations

    • Oracle NetSuite
    • SAP
    • Microsoft Dynamics
    • Workday
    • Salesforce
    • Slack
    • Microsoft Teams
    • SharePoint

    Key Partnerships

    Y Combinator
    Vercel
    NVIDIA

    Connect

    Website
    rex.inc
    X / Twitter
    rexdotinc
    LinkedIn
    rex-ai-inc

    AI Topics

    3

    Rex AI, Inc. focuses on these topics:

    Autonomous Systems(1)
    Workflow Automation(1)
    Business Accounting(1)
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