Clausul is a document comparison software solution that helps lawyers and legal teams identify substantive changes between contract versions by separating material edits from formatting noise. When two versions of a Word document are compared using standard tools, including Microsoft Word's built-in Compare, every difference receives equal weight. A changed font size appears alongside a changed liability cap in the same undifferentiated redline markup. On a typical contract revision, formatting changes can account for 60 to 80 percent of all tracked differences. This makes it difficult for reviewers to locate the edits that affect rights, obligations, or commercial terms. Clausul addresses this by combining a deterministic diff engine with AI-powered change classification. After uploading two .docx files, the software compares them at the text, paragraph, and table level, then categorizes each change as either substantive (amounts, dates, obligations, defined terms, termination provisions) or cosmetic (font, spacing, margins, style changes). The result is a prioritized view where material changes appear first, each with a plain-English explanation of what was modified. Formatting differences are collapsed by default but remain available for review. Key capabilities include: - Semantic change classification. Each change is categorized by what it affects (content vs. formatting) and annotated with an AI-generated summary explaining the edit in context. - Table-aware comparison. Row-aligned diffing that handles structural changes like added or removed columns without misaligning surrounding content. - Word redline export. Generates a .docx file with standard tracked changes that supports accept/reject workflows in Microsoft Word. - AI review summary. An executive overview groups all changes by negotiation theme and flags which edits are likely to require attention. Clausul is designed for small and mid-size law firms (2 to 50 lawyers), solo practitioners, and in-house legal departments at mid-market companies. Common use cases include contract redline review, counterparty markup analysis, and version reconciliation across negotiation rounds. The software is cloud-based and requires no desktop installation, Word plugin, or document management system integration. Pricing starts at $29 per user per month or $249 per user per year, with a 14-day free trial that provides full product access without requiring a credit card. Documents are encrypted at rest and in transit, with audit logging and configurable retention controls.