Spellbook is an AI assistant specialized in reviewing and drafting legal contracts, integrated directly into Microsoft Word. It uses GPT-5, Claude, and other leading LLMs to identify risks, generate clauses, ask questions about contract content, and compare terms against market standards based on over 2,000 benchmarks. The Spellbook Associate feature marks a major milestone: the first AI agent for lawyers capable of planning and executing complete multi-document projects. With over 4,000 legal teams in 50+ countries, the tool has established itself as the reference for contract AI for transactional lawyers.
What is Spellbook?
The essentials
Spellbook is a Microsoft Word add-in powered by leading LLMs (GPT-5, Claude) specially trained for contract law. It enables lawyers to review, draft, annotate, and analyze legal documents directly in Word without changing their work environment. The platform is complemented by Spellbook Associate, an AI agent capable of managing multi-document projects from end to end.
Key features
Spellbook’s key features include: Review (automatic redline drafting with risk flagging), Draft (clause generation from templates), Ask (questions/answers on contract content), Benchmarks (comparison to 2,000+ market standards), and Associate (AI agent for multi-document projects). The tool also supports custom playbooks and integrations with law firm document management systems.
Use cases
Spellbook is primarily used by transactional lawyers to accelerate the review of commercial contracts, confidentiality agreements, and term sheets. In-house legal teams use it to standardize their contract templates and reduce negotiation cycle times. Large firms use it for due diligence projects involving simultaneous review of many documents.
Advantages
Spellbook drastically reduces the time spent on contract review, allowing lawyers to focus on high-value negotiations. Automatic comparison to market benchmarks improves the quality of negotiating positions. Word integration eliminates any friction in adoption. SOC 2, GDPR, and CCPA certifications guarantee compliance for large accounts.
Pricing
Spellbook does not publish a fixed pricing schedule on its website. Market estimates indicate pricing starting around $49/user/month for entry plans, up to $300-350/user/month for enterprise plans. A 7-day free trial is available. Prices vary based on the number of users and required features.
Conclusion
Spellbook is the go-to tool for any law firm or legal team seeking to integrate AI into their contract review process. Its native Word integration, functional depth, and high security standards make it a premium and sustainable choice.