Contract Analyzer
AI-Powered Legal Contract Analysis & Tracked-Change Redlining Engine
Built for UAE legal practices and international commercial contracts.
🔗 Live Deployments & Demo
⚖️ The Core Principle: "Never Trust the AI"
In legal contract analysis, hallucinated quotes or fabricated clause citations can compromise legal counsel. This application is engineered around one foundational rule:
The AI is strictly an unprivileged drafter.
It is never trusted for coordinates, offsets, page numbers, or quote authenticity. Every supporting citation must be independently discovered, bounded, and verified by our deterministic TypeScript verification engine inside the source document.
- Matched quotes are verified with green badges and interactive viewport jump links.
- Unmatched or altered quotes are flagged as
UNVERIFIED and barred from citation overlays.
- If an answer does not exist in the contract, the engine reports its absence rather than inventing terms.
📸 Visual Tour
1. Document Chat & Precision Citation Highlighting
Ask complex questions against 100+ page contracts. Clicking any verified quote jumps directly to the rendered page and overlays viewport bounding-box highlights.
2. Clause-by-Clause Contract Comparison
Compare two contract versions with Needleman-Wunsch sequence alignment, plain-language legal change summaries, and automatic risk severity scoring (HIGH / MEDIUM / LOW).
3. Multi-Document Cross-Contract Analysis
Query across multiple agreements simultaneously (e.g. comparing master agreements against NDAs) with document-isolated quote verification and unified legal synthesis.
📋 Feature Matrix (Assignment Requirements)
| Section | Feature | Implementation Details | Status |
|---|
| Part A.1 | Upload & Processing | PDF (pdfjs-dist) & DOCX (mammoth) extraction, magic-byte sniffing (pdf-parse/mammoth), scanned PDF detection (amber alert banners for missing OCR text), encrypted file rejection. | 100% Complete |
| Part A.2 | Streaming Chat | Server-Sent Events (SSE) streaming answers word-by-word with abort controller support; persistent chat sessions per document in PostgreSQL. | 100% Complete |
| Part A.3 | Quote Verification Engine | Independent deterministic substring & normalized token matcher; supports curly/straight quotes, soft hyphens, whitespace compression, and case-insensitivity. | 100% Complete |
| Part A.4 | Large Contracts (150+ Pages) | Tested on 162-page Facility Agreement. Automatic Thorough Scan Mode for negative/absence queries with chunked map-reduce and honest coverage badges (COMPLETE vs PARTIAL). | 100% Complete |
| Part B.5 | Citation Highlighting | Viewport coordinate mapping with PDF text layer bounding boxes; DOCX reading mode DOM text ranges; multi-line & across-page highlight support. | 100% Complete |
| Part B.6 | Multi-Document Chat | Multi-contract selector with D1/D2 aliases, comparative synthesis, and strictly document-isolated quote verification. | 100% Complete |
| Part B.7 | |
This is the beginning of the README. Read the rest at the original. Read the full README ↗
