Contract Comparator

AI-Powered Contract Clause Analysis

Compare contracts side-by-side with AI-powered clause extraction, semantic matching, and risk analysis. Built on the Case.dev legal AI platform.

No sign-up required — start comparing contracts immediately.

What It Does

Contract Comparator analyzes two contracts and provides:

• Clause Extraction — Automatically identifies and categorizes clauses (indemnification, termination, liability limits, etc.)
• Semantic Matching — Pairs similar clauses between documents, even when wording differs
• Risk Scoring — Rates each clause change from 0-100 based on legal significance and business impact
• Executive Summary — AI-generated overview of key findings, material changes, and recommendations

Use Cases

• Compare a vendor's contract against your standard template
• Review redlined agreements to understand what changed
• Analyze competing proposals side-by-side
• Audit contract versions for compliance drift

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Demo Limits

This demo provides free access with the following limits:

Limit	Value
Session Duration	24 hours
API Credit	$5 USD

Once either limit is reached, create an account at console.case.dev for unlimited access.

How Costs Are Calculated

• LLM Processing: ~$3 per 1M input tokens, ~$15 per 1M output tokens
• OCR (PDF/DOCX): $0.02 per page

A typical contract comparison uses approximately $0.10-0.30 in API credits depending on document length.

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Browser Isolation

All data is stored locally in your browser using localStorage and IndexedDB. Documents and comparisons are isolated per browser — data from one browser or device is not accessible from another.

localStorage

Key	Purpose
ccc:demoUsage	API usage tracking (tokens, cost, session start)
ccc:activeComparison	Currently processing comparison ID

IndexedDB

The contract-comparator database stores:

Store	Purpose
comparisons	Completed comparison results with summaries
clauseMatches	Individual clause match details and risk scores
contracts	Uploaded contract metadata and extracted text

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Getting Started

1. Clone and Install

git clone https://github.com/CaseMark/contract-comparator-demo.git
cd contract-comparator-demo
npm install

2. Configure Environment

cp .env.example .env.local

Add your Case.dev API key (get one free at console.case.dev):

CASEDEV_API_KEY=your_api_key_here

3. Run Development Server

npm run dev

Open http://localhost:3000.

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Full API Access

Ready to build your own legal AI application?

→ Get Started at console.case.dev

Case.dev provides:

• LLM API — OpenAI-compatible chat completions optimized for legal tasks
• OCR API — Extract text from PDFs, DOCXs, and images
• Semantic Search — Vector-based document retrieval
• Vaults — Secure document storage with automatic indexing

Pricing starts at $0.01 per credit with volume discounts available.

Resources

• Case.dev Documentation
• API Reference
• SDK Examples

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Tech Stack

• Framework: Next.js 16 (App Router)
• Language: TypeScript
• Styling: Tailwind CSS 4 + Base UI
• AI Platform: Case.dev
• Storage: localStorage + IndexedDB (browser-only, no server database)

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Project Structure

├── app/
│   ├── (protected)/      # App routes (dashboard, compare)
│   │   ├── dashboard/    # Comparison history
│   │   └── compare/      # New comparison & results
│   └── api/
│       └── contracts/    # Compare & extract endpoints
├── components/
│   ├── demo/             # Usage banner & limit dialog
│   └── ui/               # Base UI components
├── lib/
│   ├── case-dev/         # Case.dev API client
│   ├── usage/            # Demo limit tracking
│   ├── storage/          # localStorage & IndexedDB helpers
│   └── contexts/         # React contexts
└── types/                # TypeScript definitions

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License

This project is licensed under the Apache 2.0 License.

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_{Built with Case.dev — The Legal AI Platform}