Quick Verdict
| Criteria | Harvey | Spellbook |
|---|---|---|
| Primary use | Full legal AI platform | Contract drafting in Word |
| Best for | Enterprise firms (50+ attorneys) | Any firm that drafts contracts |
| Deployment | Web platform + integrations | Microsoft Word plugin |
| Price | ~+/user/month (enterprise) | /user/month |
| Setup time | 8-16 weeks | 1-2 weeks |
| Security | SOC 2 Type II, on-prem option | SOC 2 compliant |
| Bottom line | Broadest legal AI capability | Fastest ROI for contract drafting |
These tools are not direct competitors. Harvey covers the entire legal workflow; Spellbook dominates one specific workflow (contract drafting). Many firms benefit from using both.
What Each Tool Does
Harvey: Full Legal AI Platform
Harvey is built for enterprise legal work. It handles contract analysis, due diligence, regulatory compliance, litigation research, and document drafting. It is used by AmLaw 100 firms including Allen & Overy (A&O Shearman) and PwC Legal.
Harvey runs on GPT-4 fine-tuned on legal data. It processes multiple documents simultaneously, cites sources, and provides confidence scores. Enterprise security includes SOC 2 Type II compliance and data isolation options.
Spellbook: AI Contract Drafting in Word
Spellbook is a Microsoft Word add-in that suggests clause language, identifies risky terms, and provides alternatives based on market standards. It does not require attorneys to learn a new platform — it works inside the tool they already use for drafting.
Spellbook focuses exclusively on the drafting and review stage. It does not handle research, due diligence, or compliance. For contract drafting specifically, it is faster to deploy and significantly less expensive than Harvey.
Feature Comparison
Contract Drafting
Spellbook wins. Its Word integration means zero workflow change. Attorneys get AI suggestions inline while drafting. Harvey can draft contracts but requires a separate web interface. For firms whose primary bottleneck is drafting speed, Spellbook delivers value in days, not months.
Legal Research
Harvey wins. Spellbook does not do legal research at all. Harvey handles case law analysis, statutory interpretation, and regulatory research with source citations and confidence scores. For firms that need both research and drafting, Harvey is the only option of the two.
Due Diligence
Harvey wins. Harvey's multi-document analysis lets it review hundreds of contracts simultaneously, extracting key terms and identifying risks. Spellbook does not have due diligence capabilities.
Implementation Speed
Spellbook wins. Install the Word plugin, sign in, and start drafting. Total setup time: under an hour. Harvey requires security review, workflow configuration, training, and pilot deployment — typically 8-16 weeks.
Enterprise Security
Harvey wins. SOC 2 Type II, on-premises deployment, and data isolation meet AmLaw 200 security requirements. Spellbook is SOC 2 compliant but does not offer on-premises deployment or the same depth of enterprise security controls.
Pricing Comparison
| Harvey | Spellbook | |
|---|---|---|
| Base price | ~+/user/month | /user/month |
| Minimum commitment | Annual contract | Monthly or annual |
| Implementation cost | - | |
| First-year cost (50 users) | -+ | - |
Who Should Choose What
Choose Harvey if: You are an AmLaw 200 firm or enterprise legal department that needs AI across research, due diligence, compliance, and drafting. You have budget for enterprise implementation and an internal champion to drive adoption.
Choose Spellbook if: You primarily need AI-assisted contract drafting. You want value in days, not months. You work in Microsoft Word and want AI without changing your workflow. Your firm is under 100 attorneys.
Choose both if: You need enterprise AI for research and due diligence (Harvey) plus best-in-class contract drafting (Spellbook). Some firms use Harvey firm-wide and Spellbook for their contracts team.
Frequently Asked Questions
Yes. They solve different problems. Harvey handles firm-wide AI needs (research, compliance, due diligence), while Spellbook handles contract drafting in Word. They do not conflict.
Spellbook. Because it installs in Word with zero training, attorneys see time savings immediately. Harvey's broader capabilities require weeks of implementation before ROI materializes.
Yes. Spellbook focuses exclusively on drafting and reviewing contracts in Microsoft Word. It does not handle legal research, due diligence, or regulatory compliance.
For large firms doing significant M&A, litigation, or regulatory work — yes. Harvey's multi-document analysis and enterprise security justify the implementation investment. For smaller firms focused on routine contract drafting, Spellbook is the more practical choice.
Disclaimer: This comparison is for educational purposes only. Pricing and features may change; verify current information on vendor websites. LegalToolGuide may earn commissions from affiliate links.