Crosby

What Crosby does

Crosby is an AI-native hybrid law firm founded in 2024 in New York City that combines proprietary legal AI agents with licensed human attorneys to review and negotiate commercial contracts. The company serves primarily high-growth startups and scale-ups (Cursor, Clay, Rogo, Braintrust, Cognition, Browserbase, Baseten, Physical Intelligence, Warp, Gumloop, and others) along with select mid-market and enterprise customers (Tishman Speyer, Starwood Capital Group). Customers submit contract review requests through Slack, email, or their CLM and receive AI-assisted redlines back, with a reported 58-minute median turnaround across ~100 clients and 13,000+ cumulative contracts reviewed.

The core technology stack consists of custom-trained legal AI agents built on Anthropic's Claude frontier models, layered over a proprietary knowledge infrastructure called Crosbrain that encodes each client's legal playbook, preferences, deal context, and negotiation history. The Crosby Client Console web application gives in-house legal and business teams visibility into active matters, routing rules, approval matrices, and real-time redlining. Crosby has separately released Redline Bench, a public benchmark tool co-developed with Micro1 for evaluating AI-generated legal redlines, and is experimenting with voice agents capable of conducting live contract negotiations over the phone. The talent base combines lawyers from Harvard, Stanford, and Columbia Law (plus Sullivan & Cromwell alumni) with engineers from Ramp, Vanta, Meta, and Google.

Crosby operates a transaction-based revenue model, charging fixed, transparent per-contract fees rather than hourly legal billing, with human attorney escalations bundled into the same pricing. Distribution is dual: a Slack-first self-serve flow for high-growth startups plus an emerging enterprise field sales motion via a Founding Account Executive. Across three funding rounds — a $5.8M seed in June 2025 (Sequoia-led), a $20M Series A in October 2025 (Index/Bain/Elad Gil-led), and a $60M Series B in March 2026 at a reported $400M valuation (Lux/Index-led) — the company has raised approximately $85.8M from Sequoia Capital, Index Ventures, Bain Capital Ventures, Lux Capital, Elad Gil, 01 Advisors, Cooley LLP, and Patrick Collison.

Name

Crosby

Legal name

Crosby Legal, Inc. / Crosby Legal PLLC

Website

https://crosby.ai

Company type

Private

Founded year

2024

Operating status

Operating

Headcount range

101–250 employees

Short description

Crosby is an AI-native hybrid law firm combining custom legal AI agents with licensed attorneys to review and negotiate commercial contracts. Founded in 2024 in NYC, it serves high-growth startups and select enterprises with Slack-first, per-contract fixed pricing.

Ownership category

akta.pro rank

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Per-contract legal services: Customers pay a fixed, transparent fee per contract reviewed rather than hourly legal fees. Revenue scales with contract volume; the model is positioned as a land-and-expand motion as customers increase deal velocity.
2. Professional legal services: Human attorneys handle escalations, novel matters, and complex negotiations; these are bundled into the per-contract pricing rather than billed separately.

Pricing tiers

Go-to-market motion3 records

Distribution channels2 records

Marketing channels4 records

Core offering

Crosby is an AI-native hybrid law firm that combines custom-trained AI legal agents with licensed human attorneys to review, redline, and negotiate commercial contracts including NDAs, MSAs, DPAs, and vendor agreements. The service is delivered via Slack, email, or CLM with a 58-minute median turnaround, and is sold on fixed per-contract pricing rather than traditional hourly legal fees. Crosby operates as a registered law firm with malpractice insurance and is supported by the proprietary Crosbrain knowledge infrastructure that encodes each client's playbook and negotiation history.

Product overview

Crosby operates as a single vertically integrated AI-native law firm platform rather than a modular suite. The core Crosby product combines proprietary AI agents with licensed human lawyers to review and negotiate commercial contracts, and is powered by Crosbrain — a centralized knowledge infrastructure that stores client-specific context, prior agreements, clause libraries, and routing rules. The Client Console is an application within the platform that enables in-house teams to manage contract workflows collaboratively, including routing, approvals, and real-time redlining. Separately, Crosby has released Redline Bench, a public benchmark tool designed to measure AI model performance on real-world contract review tasks. Crosby Intelligence (intelligence.crosby.ai) is an adjacent sub-site referenced in the navigation. The platform integrates natively with Slack for user-facing document submission and legal communication.

Differentiator

Problem solved

Functional benefit

Brands

• Crosbrain: Crosby's centralized, client-specific knowledge infrastructure that stores prior interactions, preferences, decisions, counterparty positions, and contract context, powering the AI agents and enabling compounding review performance for each customer.
• Crosby Client Console
• Redline Bench

Products and services

• Crosby (AI-powered contract review service) AI-powered contract review, redlining, and negotiation service that combines proprietary legal AI agents with licensed human attorneys to handle NDAs, MSAs, DPAs, and vendor agreements for startups and enterprise customers. Delivered via Slack, email, or CLM with fixed per-contract pricing and a 58-minute median turnaround.
• Client Console Web application that enables in-house legal and business teams to collaboratively manage contract workflows with Crosby, supporting drag-and-drop document upload, routing rules, configurable approval matrices, real-time commenting and redlining, and deadline tracking.
• Redline Bench Public benchmark tool that evaluates AI model performance on real-world legal tasks such as contract review and redlining, comparing frontier models (Claude, GPT, Gemini) against curated contracts and an attorney-judged answer key and producing leaderboard rankings on reasoning quality and hallucination metrics.

Quantifiable outcome

• 58-minute median turnaround from request to redline delivery
• +6 more outcomes

Named customers28 records

Segments4 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

AI capability10 records

Feature6 records

Partnerships

Three partnerships are on record, tiered core and minor.

• AnthropiccoreTechnology or IntegrationCrosby uses Anthropic's Claude frontier models to power its custom legal agents.
• Micro1coreStrategic or Co-development PartnerPartnered with Crosby to build Redline Bench, a benchmark for evaluating the quality of AI-generated legal redlines.
• Sullivan & CromwellminorOthersCrosby has recruited lawyers from Sullivan & Cromwell, a major global law firm, to build out its bench of licensed attorneys.

Scale indicators8 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Eudia: Eudia is an AI-augmented law firm competitor explicitly named alongside Crosby on a 2026 industry list of AI law firms to watch, offering a similar hybrid AI-plus-licensed-lawyer model for in-house legal teams.
• Harvey: Harvey builds AI tools and agents for law firms and in-house legal teams, including contract review and drafting workflows. It overlaps directly with Crosby's custom-agent, enterprise-facing legal AI offering.
• Spellbook: Spellbook is an AI copilot for lawyers that drafts, reviews, and redlines contracts using frontier models. It targets a similar buyer (in-house counsel at growing companies) and competes head-on for contract review throughput.
• Ironclad: Ironclad is a digital contract lifecycle management (CLM) platform that has layered AI-powered review and redlining on top of its workflow product. It is a direct competitor on contract review and workflow automation for in-house legal teams.
• Robin AI: Robin AI is an AI contract review and drafting platform serving in-house legal teams and law firms, with a hybrid model that combines AI with human lawyers. It targets the same customer base of high-growth and mid-market legal teams as Crosby.
• Luminance: Luminance is an AI platform for contract review, due diligence, and compliance used by enterprise legal teams and law firms. It is comparable to Crosby's contract review agents and competes for the same enterprise legal buyer.
• ContractPodAi (now Evisort): Evisort is an AI contract lifecycle management platform offering automated review, redlining, and extraction for in-house legal teams. It overlaps with Crosby's agentic review and CLM-adjacent Client Console capabilities.

Broad incumbents

• Thomson Reuters (CoCounsel / Practical Law): Thomson Reuters is a broad incumbent legal information and technology provider that ships CoCounsel, an AI legal assistant for contract review, drafting, and due diligence. It competes with Crosby from a much larger installed base across law firms and corporate legal departments.
• LexisNexis (Lexis+ AI): LexisNexis is a broad incumbent legal information and AI provider offering Lexis+ AI for legal research, drafting, and analysis. It competes with Crosby by bundling AI capabilities into an established legal data and workflow stack.

Emerging players

• EvenUp: EvenUp is an AI legal services company that combines AI with legal professionals to produce case documents for personal injury law firms. It shares Crosby's AI-plus-licensed-lawyers architecture and demonstrates the broader agentic law-firm category expanding across practice areas.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/crosbylegal
• LinkedInlinkedin.com/company/crosbylegal
• Instagraminstagram.com/crosbylegal

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries2 records

Funding overview

Funding rounds3 records

Investors8 records

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 Crosby