Version Story Compare

Version Story is redlining infrastructure for legal teams that are bringing AI into contract work. Its Compare tool is a rules based redline engine that produces deterministic comparisons between two versions of a document, so the same inputs always yield the same redline. Alongside it, Track builds a unified history of a document by attributing each change to a version and an author, and Merge reconciles parallel edits from several reviewers into a single tracked document. It is designed for law firms and in house legal teams negotiating complex agreements, and for teams that route documents through AI models such as Claude, OpenAI models and Gemini. The engine, written in Rust, accepts Word documents, legacy Word files and PDFs, including scanned PDFs that pass through OCR, and handles paragraphs, tables, cross references, tables of contents, comments, headers and footers, and footnotes and endnotes. Output options include Word with tracked changes, PDF of the full document or of changed pages only, and Markdown and JSON for agents; the vendor's own testing found Markdown output markedly faster for AI agents than Word or PDF on small redlines. Access is through a REST API and a Model Context Protocol integration for Claude. Security controls include SOC 2 Type 2, independent penetration testing and data retention controls. Pricing is not published. Prospective customers request a demo or sign up for a trial, and there is no public pricing page.