! Not legal advice. Always have a licensed attorney review any AI-generated contract summary before taking legal action.
Sub-desk · Contract review
AI contract summarizer
Spellbook, Harvey, CoCounsel compared on representative NDA and SaaS MSA shapes.
Spellbook wins for contract review inside Microsoft Word for solos and small firms ($39 to $179/seat/mo). Harvey for large firm multi-document workflows. CoCounsel for comprehensive review with integrated legal research. No AI contract summarizer substitutes for attorney review on actionable documents.
§ I.Tools at a glance
The reader-applicable rubric for evaluating any contract review tool covers: clause identification accuracy (3 pts), non-standard term flagging (2 pts), obligation summary completeness (2 pts), risk highlight quality (2 pts), and interface usability (1 pt). Apply it to a representative NDA or SaaS MSA you actually need reviewed on whichever tool you are evaluating. The summary table below describes each tool's positioning, training focus, and price; verdicts reflect editorial assessment based on vendor documentation and side-by-side output review.
| Tool | Focus | Clause handling | Risk flagging | Price |
|---|---|---|---|---|
| ✓Spellbook | Word add-in for solos and small firms | Trained on contract corpus, identifies non-standard clauses | Excellent on standard clause types | $39 to $179/seat/mo |
| ✓Harvey | Enterprise biglaw multi-document workflow | Strongest on cross-document reasoning per Harvey case studies | Excellent, designed for Am Law 200 | Enterprise |
| ✓CoCounsel | Bundled with Westlaw legal research | Combines clause review with case-law lookup | Very good for TR/Westlaw subscribers | Enterprise (TR bundle) |
| ◆Clio Duo | Integrated with Clio matter management | Adequate, not a standalone product | Good for solos already on Clio | Bundled with Clio |
| ✗Claude (consumer) | Non-privileged review only | General-purpose, misses contract-specific patterns | Fair, misses non-standard carve-outs | $20/mo |
| ✗ChatGPT Plus | Non-privileged review only | General-purpose, verbose output | Fair, prone to verbosity | $20/mo |
Verdicts reflect editorial assessment. Claude and ChatGPT consumer plans are listed only for non-privileged review context.
§ II.What AI gets right and wrong
Where AI performs well
- ✓Identifying standard clause types (confidentiality, indemnification, limitation of liability, governing law, dispute resolution)
- ✓Flagging non-standard carve-outs and unusual exception language
- ✓Summarising party obligations and key dates
- ✓Identifying missing standard provisions
- ✓Extracting defined terms and their definitions
Where AI consistently fails
- !Risk from the interaction of clauses (where two standard clauses combine to create unusual exposure)
- !Jurisdiction-specific legal nuance
- !Context from the deal structure (acceptable in a routine vendor contract, problematic in a strategic partnership)
- !Evaluating negotiating position and commercial risk tolerance
- !Obligations embedded in recitals or definitions rather than operative clauses
§ III.Common questions
Q.01How does AI contract review work?
AI contract review tools parse the document's text, identify clause types using training data from thousands of contracts, and flag clauses that deviate from standard templates. Tools like Spellbook are fine-tuned specifically on contract language, which makes them significantly more accurate than general-purpose AI for identifying specific clause patterns. The AI does not understand legal risk in the way an attorney does; it identifies patterns, not legal consequences. Attorney review of flagged items is always required.
Q.02What is Spellbook and how much does it cost?
Spellbook is a Microsoft Word add-in specifically designed for contract review. It identifies non-standard clauses, suggests redlines, summarizes contract obligations, and flags potentially problematic provisions. As of April 2026, Spellbook's pricing starts at approximately $39/seat/month for a starter plan, scaling to $179/seat/month for the full professional tier with advanced analytics and multi-document support. They offer a free trial period.
Q.03Can AI miss important clauses in a contract?
Yes, and this is a critical limitation. AI contract review tools are trained to identify common clause patterns, but they can miss clauses embedded in unusual formatting, obligations expressed indirectly rather than in standard clause form, context-dependent risk (where a clause is fine in isolation but problematic in the context of the full agreement), jurisdiction-specific nuances, and non-standard defined terms. The ABA guidance is clear: AI identifies patterns, attorneys interpret legal risk.