Eve is legal AI built only for plaintiff law firms, developed by Butler Labs, Inc. of San Francisco, which does business as Eve Legal. It was founded by chief executive Jay Madheswaran, previously at Lightspeed Venture Partners, Facebook and Rubrik, with chief product officer Matt Noe and chief architect David Zeng. Its platform, EveOS, which the vendor calls the AI operating system for plaintiff law, covers personal injury, labor and employment, medical malpractice, social security and disability, and workers' compensation practices. The homepage says more than 1,700 firms use Eve, and named customers include Mike Morse Law Firm, the Law Office of James Scott Farrin, Hershey Law, Frontier Law Center, Laurel Employment Law, Jeffrey Glassman Injury Lawyers and Archuleta Law Firm.
Eve works a case from intake to resolution. Its intake voice agent answers calls 24 hours a day, scores each lead, sends the engagement letter during the call so the client can sign before hanging up, and syncs call details to Clio Grow, Lead Docket, SmartAdvocate and other intake systems. The vendor puts its language coverage at 28 or more languages on the intake page and 30 or more on the Comms Agent page, which also places outbound case calls and transfers a caller to a person on conditions the firm sets. For case work, Eve builds medical chronologies from records and bills, drafts demand letters in the firm's own style, drafts complaints and other documents, propounds and responds to discovery, and supports trial preparation. Eve Research searches case law, statutes, regulations, medical literature and corporate filings from inside a matter and answers with citations.
In January 2026 Eve added Agents, which detect updates to a case and do work such as reviewing records, drafting demands and propounding discovery; the Auditor, which checks every case in the inventory each night for issues such as undiagnosed traumatic brain injuries, missed MRIs and mass tort eligibility; and Analyst, which answers questions about the firm's operations in plain English with dashboards that refresh from live case data. Atlas keeps an always-on case file by reading records, bills, calls and documents as they arrive. The platform page says permissioned agents act through approved workflows while people review the outputs and decisions.
Eve's knowledge base documents integrations with the Clio, Litify, SmartAdvocate and Growpath case management systems, Clio Grow and Lead Docket for intake, DocuSign for signing engagement letters during calls, SharePoint, OneDrive, Dropbox, Google Drive and Box for documents, and the Zoom Contact Center, Spectrum VoIP and Five9 phone systems, with Zoom Phone, RingCentral, Dialpad, CallHarbor and 3CX in beta. The same page says open APIs and custom MCPs let firms connect private databases and internal tools, and Eve's subprocessor list names Merge as its MCP and connector platform. Eve publishes no public API or MCP documentation.
Pricing is not published: firms book a call for a quote. Eve's published Terms of Service describe the structure, with a platform fee tiered by the number of existing matters in the service, metered usage such as voice-agent minutes and leads, and usage above the order's entitlements billed monthly as a true-up. An order runs for the term it states, or one year if it states none, and renews automatically for one-year terms unless either side gives notice at least 30 days before the term ends.
Eve's security page says its information security program follows the SOC 2 framework, with independent audits and an annual third-party penetration test. Services run on Amazon Web Services and Microsoft Azure, customer data is stored in AWS databases in the United States, and data is encrypted at rest and in transit. Its trust page lists SOC 2 Type 2 certification, which it describes as a first for legal AI, and HIPAA compliance. The privacy policy says Eve uses zero-data-retention endpoints with its third-party LLM providers and prohibits them from training models on customer data, and the subprocessor list names OpenAI, Anthropic, Google Cloud, AWS and Baseten for model processing. Neither the terms nor the privacy policy say whether Eve trains its own models on customer data.
Eve is built only for the plaintiff side. Defense firms, transactional practices and in-house legal teams can look at Harvey AI for broad legal work across practice areas, CoCounsel for research grounded in Westlaw, Lexis+ with Protégé for research across LexisNexis content, or Spellbook for contract drafting and review in Microsoft Word.
Current state Q4 2026: EveOS reached general availability in August 2026 alongside Analyst and Atlas. Eve raised a $103 million Series B led by Spark Capital in September 2025 at a reported valuation of $1 billion or more, after a $47 million Series A led by Andreessen Horowitz in January 2025. Hershey Law used Eve in a trial that ended in a $27.5 million whistleblower verdict in August 2025. G2 lists Eve Legal under Butler Labs, Inc. with 51 reviews at 4.9 out of 5.
