CoCounsel vs Spellbook (2026)

CoCounsel

by Thomson Reuters

Spellbook

by Spellbook

Pros

• ✓Grounded in Thomson Reuters' own content: CoCounsel Legal reasons from Westlaw and Practical Law plus a firm's documents, showing its step-by-step reasoning with linked citations to verify.
• ✓Handles volume and drafting: Tabular Analysis runs up to 100 questions across 10,000 documents, Westlaw Brief Builder drafts litigation briefs, and it works inside Word, Outlook, Teams and, through a pilot MCP connector, Claude.
• ✓Published online pricing for smaller firms, with CoCounsel Essentials from $360/mo billed annually, and 116 G2 reviews at 4.7 out of 5, plus a trust profile listing SOC 2 Type II, ISO 27001 and ISO 42001.

Limitations

• –Built around the Thomson Reuters stack: the full CoCounsel Legal plan bundles Westlaw Advantage and Practical Law at $784 per attorney per month on a one-year plan, which firms committed to another research platform may not need.
• –Online pricing stops at 10 attorneys and plans run for one to three years with no month-to-month option, so larger firms and corporate legal departments need a sales conversation.
• –The Claude MCP connector is a pilot that Thomson Reuters may withdraw without notice, its terms bar using Thomson Reuters content with other professional AI tools through an MCP, and no public developer API is published.

Pros

• ✓Works where contracts are negotiated: Review proposes redlines as native Word tracked changes against a team's playbooks, and the same engine runs in Google Docs and on the web.
• ✓Covers more than single documents: Associate runs multi-document work such as data room reviews and disclosure schedules under lawyer supervision, and Autonomous Contract Management, now generally available, handles intake from email, Slack and Salesforce.
• ✓Strong security posture for legal data: SOC 2 Type II, HIPAA with BAAs, GDPR and an EU AI Act low-risk assessment, plus zero-data-retention agreements with OpenAI and Anthropic.

Limitations

• –No published prices: pricing is custom per team member and quoted through a demo, though a 7-day free trial is open to individual lawyers and legal teams.
• –Built for transactional contract work: it does not cover litigation research or case law analysis, so firms that need both will pair it with a research platform.
• –No MCP server or public developer API is published, so connections beyond its document-management and storage integrations are not available.