Spellbook

Spellbook is a Microsoft Word add-in for transactional lawyers and legal teams that uses AI to review, draft, and redline commercial contracts without leaving Word.

Key capabilities include:

• AI contract review and redlining that scans for risks, drafting errors, inconsistencies, and unusual terms, then proposes inline redline suggestions and comments.
• Contract drafting assistance to generate clauses and language, plus autofill for common sections and reusable drafting patterns.
• Playbooks to save and reuse review instructions and preferences across matters.
• Ask and summaries that answer clause-specific questions (with citations) and generate summaries and explanations of complex sections.

Pricing: a 7-day free trial; paid pricing (contact for pricing)

Notable for working directly inside Word and being tuned for commercial legal work, with support for multiple LLMs (including GPT-5, Claude, GPT-4, and Opus). Spellbook also reports adoption by 4,000+ legal teams in 80+ countries, over 10 million contracts reviewed, and independent testing results with Wilson Sonsini (95% accuracy on first-party contracts, 92% on third-party contracts, 94% on issue detection).