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Legal AI & NLP

Law-OSS

jalalhaider550/Law-OSS

An open source legal AI assistant

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Legal AI & NLP

Law OSS

The open source legal AI platform. A free alternative to Harvey and Legora.

Bring your own Claude or Gemini API key. You pay the provider directly — we make nothing from your usage. Free forever. Self-host it or use it hosted at lawoss.com.

What is Law OSS?

Law OSS is a free, open-source alternative to Harvey and Legora. Sign up, add your own Claude or Gemini API key in Settings, and every feature is immediately available. Your key is encrypted and stored securely, used server-side to call the AI provider on your behalf.

Six Specialist Agents

Agent What it does
Research Finds case law and statutes with citations verified against CourtListener and The National Archives
Drafting Drafts letters, agreements, motions and clauses — outputs a formatted Word document
Contract Reviews contracts clause by clause, flags risk, suggests redlines
Litigation Builds case strategy and litigation chronology
Compliance Identifies applicable regulations and compliance gaps
Due Diligence Structures DD findings across corporate, financial, legal, IP, employment and property

Verified Legal Research

Every citation is checked against real databases before it reaches you — CourtListener for US case law, and The National Archives for UK case law and legislation. If a source cannot be verified, Law OSS says so.

Tech Stack

  • Frontend: Next.js 14 (App Router), deployed on Vercel
  • Backend: Express + TypeScript, deployed on Railway
  • Database: Supabase (Postgres, Auth, Storage)
  • ORM: Prisma
  • AI: Claude (Anthropic) and Gemini (Google), user-supplied key

Quick Start — Use it hosted

  1. Go to https://lawoss.com
  2. Sign up
  3. Add your Claude or Gemini API key in Settings
  4. Start using any of the 6 agents, contract review, or research

Self-Hosting

Requirements: Node.js 20+, a free Supabase account, a Claude or Gemini API key.

git clone https://github.com/jalalhaider550/Law-OSS.git
cd Law-OSS
npm install

Create a Supabase project. Create storage buckets named contracts and documents. Copy your project URL, anon key, and service role key.

cp apps/api/.env.example apps/api/.env
cp apps/web/.env.example apps/web/.env.local

Fill in your Supabase values, then:

npm run db:push
npm run dev

Open http://localhost:3000

Deploying to production

  • Frontend (apps/web) → Vercel
  • Backend (apps/api) → Railway

How API Keys Work

  1. You add your Claude or Gemini API key in Settings
  2. Law OSS verifies the key works with the provider
  3. The key is encrypted (AES-256) and stored in your database
  4. Every AI request uses your key to call Anthropic or Google directly — you pay the provider, not us

Get a key: console.anthropic.com (Claude) or aistudio.google.com (Gemini). Typical cost: a few cents per task.

License

Law OSS software is made available under open-source licences. Your use of that software is governed by the applicable open-source licence terms.

Commercial licensing available on request.

Disclaimer

Law OSS is not a substitute for professional legal advice. Currently in beta. See full Terms at https://lawoss.com/terms