Spellbook
AI legal copilot for Word using GPT-5, trusted by 4,000+ legal teams for redlining, reviewing, and drafting.
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What is Spellbook?
Spellbook is an AI copilot for contracts that integrates directly into Microsoft Word, helping lawyers review, draft, and redline legal documents with speed and accuracy. The tool uses GPT-5 (previously GPT-4o) to spot risks, add automatic redlines in your name, detect aggressive or unusual terms, find buried risks, list missing clauses and definitions, and suggest negotiation points. It is trained on billions of lines of legal text, case databases, form libraries, and statutes, making it specifically tuned for contracting work.
Key features include Spellbook Suite (Word Add-In) with Review, Draft, Ask, Benchmarks, and Playbooks capabilities, plus Spellbook Associate—a multi-document AI agent that can work through complex legal matters with oversight. Users can build custom playbooks with detailed rules, save language to a clause library, compare contracts to market standards using real-time market data across industries and geographies, and get instant answers about deals from 100+ legal sources with verifiable citations. The platform works entirely within Word so lawyers have AI assistance where they already work.
Spellbook is designed for in-house legal teams and law firms, with over 4,500 legal teams in 80+ countries using it. It helps transactional lawyers scale contract flow, uncover 13% more issues, achieve 10x faster reviews, and gain confidence that agreements are defensible, enforceable, and aligned with their standards. The tool is strictly available for legal professionals—not for end-client advice—and output should always be reviewed by a lawyer, similar to GitHub Copilot for programming.
Spellbook pricing
Pricing model: Free
Spellbook has custom pricing based on the number of team members on your license. There is no self-service pricing—teams must book a demo to get personalized pricing. A 7-day free trial is available for lawyers and legal teams to test features and workflows; extended trials may be available for larger organizations. Spellbook offers free access to academic institutions (law schools and students) for hands-on experience with legal AI. The platform offers two main offerings: Spellbook Suite (Word Add-In with Review, Draft, Ask, Benchmarks, Playbooks) and Spellbook Associate (multi-document AI agent). Law firms get Spellbook Suite + Associate, group training, online support, and dedicated support for teams over 10. In-house teams get the same suite plus team training, playbook build service, and dedicated support for teams over 10.
Spellbook pros
- Integrates directly into Microsoft Word where lawyers already work
- Uses GPT-5 for sophisticated contractual risk identification
- Spots risks and adds redlines directly in your name
- Builds custom playbooks with detailed rules and answers
- 10x faster contract reviews than traditional methods
- Uncovers 13% more issues than earlier models
- Compares contracts to real-time market standards across industries
- Detects aggressive, sneaky, or unusual terms immediately
- Find risks buried deep in contract text
- Lists missing clauses and definitions automatically
- Suggests common negotiation points
- Drafts based on your precedents and legal context
- Answers from 100+ legal sources with verifiable citations
- Spellbook Associate handles multi-document legal matters
- Zero Data Retention agreements prevent data use for training
- SOC 2 Type II, GDPR, and CCPA compliant
- Clause library lets you save and reuse language
- Group and team training sessions available
- Dedicated support for teams over 10 users
- Trained on billions of lines of legal text specifically
Spellbook cons
- No self-service pricing—must book demo for customized quotes
- Pricing based on number of team members (not flat fee)
- Only available for legal professionals, not end-clients
- Output must always be reviewed by a lawyer
- No free tier—only 7-day free trial
- GPT-5 rollout still gradual for review functionality
- Custom playbooks require organization-wide setup effort
- Building clause libraries needs team coordination
- AI will never be perfect despite bias mitigation
- Not meant to replace human judgment
Frequently asked questions about Spellbook
What is Spellbook?
Spellbook is an AI copilot for contracts that uses GPT-5 to review and suggest language for contracts and legal documents right in Microsoft Word. It is trained on case databases, form libraries, statutes, and billions of lines of legal text. Spellbook helps lawyers review and draft with speed and accuracy, spotting risks, adding redlines, and suggesting missing clauses.
Who can use Spellbook?
Spellbook is strictly available for legal professionals today. It is not meant to provide advice to end-clients or to replace human judgment. It is a tool to help professionals work much more efficiently, similar to GitHub Copilot for programming. Spellbook's output should always be reviewed by a lawyer.
Does Spellbook offer a free trial?
Yes. Lawyers and legal teams can try Spellbook free for 7 days to test features, workflows, and see how the AI tooling impacts their work. For larger organizations, extended trials may be available. You need to book a demo to get started.
How is Spellbook priced?
Spellbook's pricing is based on the number of team members on your license. There is no self-service pricing—you must book a demo to talk through your team's needs and get customized pricing. The company is exploring usage-based models since computing costs grow with usage amount.
Is Spellbook secure?
Yes. Spellbook has industry-leading security, compliance, and privacy standards. It is compliant with SOC 2 (Type II), GDPR, and CCPA. Spellbook uses Zero Data Retention agreements to prevent data use for training, and implements numerous best-in-class, redundant security controls with a 'defense in depth' approach.
What models does Spellbook use?
Spellbook is built on OpenAI's GPT-4 and other large language models (LLMs). It has been trained on 42 terabytes of text from the Internet, contracts, books, and Wikipedia. Spellbook further tunes the model using proprietary legal datasets. GPT-5 is now live in Spellbook Associate for contract revision and is being gradually rolled out in review functionality.
Does Spellbook work in Microsoft Word?
Yes. Spellbook is integrated directly into Microsoft Word so you have it when you need it, where you need it. It applies precise redlines in seconds following your instructions, and you can chat with your document directly in Word. It is the only GPT-4o powered tool tuned for contracting and integrated with Word.
Can I use Spellbook for pro-bono or nonprofit work?
Yes. You can reach out using the contact form if you would like to use Spellbook to support pro-bono or nonprofit work. The company is open to supporting these use cases.
How do I get started with Spellbook?
You can sign up for the waitlist here. Over 100,000 lawyers have signed up since 2022, and the team gradually onboards users from the waitlist to ensure quality and capacity. To get started: book a demo and get onboarded, run your first AI-powered review, and chat with your document directly in Word.
Does Spellbook offer discounts for law schools?
Yes. Spellbook offers free access to academic institutions to help students and educators gain hands-on experience with leading legal AI tools. You can inquire about academic partnerships to get started.