Legal · head to head
Spellbook vs Westlaw
Spellbook
Legal
Contract drafting and review assistant inside Microsoft Word
- From
- On request
- Rated
- -
Westlaw
Legal
Thomson Reuters legal research platform, priced per seat with tiers from Edge to Advantage and negotiated enterprise contracts above 10 attorneys
- From
- On request
- Rated
- -
The short version
- Each has a real cost: Spellbook it publishes no accuracy figure for its own output and no independent evaluation exists, so a firm must run its own assessment on real agreements.; Westlaw firms of 11 or more attorneys, which is most firms actually spending serious money on Westlaw, get no published price at all and negotiate blind against a sales team that sees every prior deal.
- They diverge on capability: Spellbook covers Word add-in drafting, Westlaw covers Case law and statute database.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which Spellbook and Westlaw actually diverge.
Identical on both: starting price (On request), pricing model (quote), free tier (No), user rating (Not yet rated), category (Legal).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Spellbook
- Word add-in drafting
- Contract review
- Benchmarks against market standards
- Question answering
- Named model providers
Only in Westlaw
- Case law and statute database
- KeyCite
- Practical Law
- CoCounsel Legal
- Litigation analytics
- West Key Number System
What people use each for
The jobs each tool is most often brought in to do.
Spellbook
- Transactional lawyers drafting commercial agreements in Wordnot Westlaw
- In-house teams reviewing inbound contracts without a contract lifecycle systemnot Westlaw
- Lawyers who want a first pass at redlines before applying their own judgementnot Westlaw
- Firms that need to know which model providers process their documents before adopting an AI toolnot Westlaw
Westlaw
- A solo attorney or small firm wanting published, self-service pricing rather than a sales negotiationnot Spellbook
- A firm evaluating whether Practical Law and secondary sources justify moving from Edge to Advantagenot Spellbook
- A litigation team wanting KeyCite and litigation analytics in the same research platformnot Spellbook
- A firm that previously used Casetext and needs to understand that it must now buy CoCounsel Legal inside Westlaw insteadnot Spellbook
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Spellbook
- It publishes no accuracy figure for its own output and no independent evaluation exists, so a firm must run its own assessment on real agreements.
- The ten times more accurate claim originated in a funding announcement as a statement of intent and has no methodology, dataset or baseline behind it.
- Contract text is processed by third-party model providers, so despite the zero data retention agreements this still needs checking against client confidentiality terms and outside counsel guidelines.
- Pricing is not published, so seat cost cannot be compared against competitors without booking a demo.
- It is a drafting assistant rather than a contract lifecycle system, so it does nothing for execution, obligation tracking or renewals.
Westlaw
- Firms of 11 or more attorneys, which is most firms actually spending serious money on Westlaw, get no published price at all and negotiate blind against a sales team that sees every prior deal.
- Casetext no longer exists as an independent, cheaper self-serve product; anyone who liked its pricing and simplicity now has to buy into the Westlaw ecosystem, typically at a higher, seat-based cost.
- Multi-year contracts are structurally rewarded with the biggest discounts, which pressures firms into 2 or 3 year commitments before they know if usage will justify the tier chosen.
- Content and features vary meaningfully between Edge and Advantage, so an apparently small monthly price difference can hide the absence of Practical Law, which many firms end up needing anyway.
- Switching away from Westlaw means retraining staff on Lexis search syntax and the Key Number System has no direct Lexis equivalent, which is a genuine cost that suppresses competitive shopping at renewal.
Pricing, plan by plan
Spellbook
On request- Spellbook$undefined/year
- Priced by the number of seats on the licence
- Rates quoted after a demo, not published
- Seven day free trial, free access for academic use
Westlaw
On request- Westlaw Edge (solo and small firm, up to 10 attorneys)$undefined/month
- Single-circuit coverage from roughly $107 to $155 a month
- All-states-plus-federal coverage roughly $266 a month
- 2-year contracts around 12% off list, 3-year around 18% off
- Westlaw Advantage (firms of 11+ attorneys)$undefined/year
- Bundles Practical Law and secondary sources
- No published price, quote via sales representative
- CoCounsel Legal available as a seat add-on, reported around $639 per seat per month
Which should you pick?
Choose Spellbook if
- You need word add-in drafting.
- You work on Windows, macOS, Web.
- You also want contract review.
Choose Westlaw if
- You need case law and statute database.
- You work on Web, iOS, Android.
- You also want keycite.
Questions people ask
- Is Spellbook or Westlaw better?
- Neither clearly leads. Spellbook starts at On request and Westlaw at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Spellbook or Westlaw?
- Spellbook starts at On request and Westlaw at On request.
- Does Spellbook or Westlaw run on more platforms?
- Spellbook runs on Windows, macOS, Web. Westlaw runs on Web, iOS, Android.
- What is Spellbook best used for?
- Spellbook is most often used for transactional lawyers drafting commercial agreements in word, in-house teams reviewing inbound contracts without a contract lifecycle system, lawyers who want a first pass at redlines before applying their own judgement, firms that need to know which model providers process their documents before adopting an ai tool. Of those, transactional lawyers drafting commercial agreements in word and in-house teams reviewing inbound contracts without a contract lifecycle system are not what Westlaw is typically brought in for.
- What can Spellbook do that Westlaw cannot?
- Spellbook covers Word add-in drafting, Contract review, Benchmarks against market standards, Question answering. Westlaw covers Case law and statute database, KeyCite, Practical Law, CoCounsel Legal.
Answered from the vendors’ own pages
Spellbook: Is Spellbook's accuracy independently verified?
No. It publishes no accuracy figure of its own, and no third-party evaluation has been published. It did not participate in the Vals Legal AI Report, the main independent lawyer-baselined benchmark. Evaluate it on your own agreements during the trial.
Westlaw: Can I still buy Casetext?
No. Casetext was retired on 1 April 2025. Its AI functionality continues as CoCounsel Legal, sold only as part of the Westlaw ecosystem.
Spellbook: Which models does it use and where does our text go?
Spellbook names OpenAI GPT-5 and Anthropic Claude models, and states it has zero data retention agreements with both providers. Confirm the current terms and subprocessor list against your client confidentiality obligations before use.
Westlaw: Why does Westlaw publish some prices but not others?
Self-service online pricing exists only for solo practitioners and firms up to 10 attorneys; larger firms are routed to a sales representative with no public rate.
Spellbook: What does it cost?
Pricing is per seat but is not published. The vendor quotes it after a demo, so the seat rate cannot be compared with competitors in advance.
Westlaw: What does CoCounsel Legal cost on top of Westlaw?
Reported figures put it around $639 per seat per month as an add-on, though this is not an official published rate and varies by contract.
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