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Spellbook vs Casetext (CoCounsel)

pairwise Last updated 2026-05-02

S

Spellbook

contract-ai
8.5 /10 C

Casetext (CoCounsel)

legal-research
8.2 /10

Compare side-by-side

Spellbook Casetext (CoCounsel)
Pricing $99/mo flat $200/mo flat
Score
8.5
8.2
AI-native Yes Yes
MCP No No
API Yes No
Integrations microsoft-word microsoft-365 ironclad microsoft-word dropbox

Spellbook and Casetext / CoCounsel are barely competitors — they sit at opposite ends of legal AI. Spellbook is a Word add-in for transactional and in-house lawyers redlining contracts. Casetext (now Thomson Reuters CoCounsel) is a legal research and litigation platform tied to Westlaw. The only reason to compare them is that mid-market firms keep being pitched both as “the AI tool you need.”

Where Spellbook wins

  • Contract drafting workflow. Spellbook lives inside Word, suggests redlines in real time, and runs playbook checks on third-party paper. CoCounsel can analyze a contract, but the loop isn’t drafting-native.
  • Time to value for transactional lawyers. Install, sign in, redline. Day one. CoCounsel requires more orientation and isn’t where deal lawyers do their actual drafting.
  • Per-seat pricing for small teams. A 10-lawyer transactional team can run Spellbook at predictable monthly cost. CoCounsel pricing assumes you’re already in the TR ecosystem.

Where Casetext wins

  • Legal research and case law. This is the actual heart of CoCounsel — pull authority, check KeyCite, draft a research memo. Spellbook does none of this.
  • Litigation work product. Document review at deposition scale, summarizing transcripts, drafting briefs with citations. Spellbook is irrelevant to litigators.
  • Westlaw integration. Citations are linked to authoritative sources. For any work that has to stand up in court, this matters.

When to use both

A full-service mid-market firm legitimately needs both: Spellbook for the corporate / transactional team that lives in Word, CoCounsel for the litigation team that lives in research and case law. Treating them as substitutes wastes one budget on the wrong workflow.

Verdict

  • Pick Spellbook if your team’s work is contract drafting, review, and playbook compliance — corporate, commercial, employment, in-house GC.
  • Pick Casetext if your team’s work is legal research, litigation prep, regulatory analysis, or anything where citations and case law are the core deliverable.
  • Pick both if you’re a full-service firm. The overlap between them is roughly zero, so there’s no double-spend.

The single mistake to avoid: trying to use Spellbook for litigation research, or CoCounsel as your daily redlining tool. Neither was built for the other’s job.