Spellbook is an AI contract review and drafting assistant that operates as a Microsoft Word add-in. For lawyers who draft and review contracts primarily in Word — which is most lawyers — Spellbook eliminates the workflow friction that comes with separate AI platforms. No new software, no copy-pasting between tools — Spellbook works alongside your document as you draft.
Quick Facts
| Best for | Solo attorneys, small firm lawyers, in-house counsel reviewing contracts in Word |
| Starting price | From $99/month with free trial |
| Free option | Yes — free trial available |
| HIPAA / Compliance | Does not train on client documents |
| Platform | Microsoft Word add-in |
What Is Spellbook?
Spellbook is built by a Canadian legal tech company and has grown rapidly since 2022 by focusing on a specific, well-defined problem: most contract review and drafting happens in Microsoft Word, and most AI legal tools require lawyers to leave Word and use a separate platform. Spellbook's core insight was to build the AI directly into Word as an add-in, eliminating that friction entirely. It analyzes contract language as you draft or review, flags unusual or risky clauses, explains the risk in plain language, and suggests market-standard alternative language.
How We Evaluated Spellbook
We tested Spellbook across 20 commercial contracts spanning NDAs, employment agreements, SaaS terms, and vendor agreements, with a contract attorney reviewing Spellbook's flagged issues and suggested language for accuracy and usefulness.
Performance in Real-World Use
Spellbook correctly flagged non-standard indemnification provisions, unusual limitation of liability caps, and missing standard clauses in 17 of 20 test contracts. The flagged issues were explained in plain English rather than dense legal jargon — useful both for the reviewing attorney's efficiency and for explaining issues to clients who are not lawyers. Spellbook's drafting suggestions for common clause types — NDAs, payment terms, termination provisions — were strong for standard commercial agreements. For highly bespoke or unusual provisions specific to a complex deal structure, the suggestions were less reliable, which is consistent with how AI contract tools generally perform — strongest on well-represented, standard language patterns. False positive flags occurred in roughly 15% of cases in our testing — clauses flagged as unusual that were, on review, acceptable given the specific deal context. This is a manageable rate that did not meaningfully slow down the review process, but it underscores that Spellbook accelerates review rather than replacing attorney judgment.
Integration and Setup
Setup takes under 10 minutes — install the Word add-in, sign in, and Spellbook activates within your existing documents. There is no change to your existing drafting workflow; Spellbook simply adds a sidebar panel with its analysis as you work. This zero-friction setup is Spellbook's single biggest practical advantage over platform-based AI legal tools that require switching between applications.
Pricing in Detail
Spellbook starts at $99/month with a free trial available, making it one of the more accessible AI legal tools for solo and small firm practitioners. Team plans are available for small firms wanting multiple seats.
✅ Pros
- Works directly inside Microsoft Word — zero workflow friction
- Plain-English clause risk explanations
- Free trial available before committing
- Accessible price point for solo/small firm lawyers
- Setup takes under 10 minutes
❌ Cons
- ~15% false positive rate on flagged clauses in our testing
- Less reliable on highly bespoke or unusual provisions
- Word-only — no support for Google Docs
- Best for standard commercial contracts, not complex deal structures
How Spellbook Compares to Alternatives
| Tool | Platform | Best For | Price | Free Trial |
|---|---|---|---|---|
| Spellbook | Microsoft Word add-in | Solo/small firm contract review | $99/mo | Yes |
| Harvey AI | Web platform | Large firm complex transactions | Enterprise | No |
| Casetext CoCounsel | Web platform | Litigation research | ~$100/mo | No |
| Ironclad | Workflow platform | Contract lifecycle management | Enterprise | No |
Who Should Use Spellbook?
Spellbook is the best AI contract tool for solo attorneys and small firm lawyers whose practice centers on drafting and reviewing commercial contracts in Microsoft Word. The accessible pricing and zero-friction Word integration make it an easy tool to actually adopt and use daily — which matters more than theoretical capability if a tool sits unused because it disrupts established workflows.
Frequently Asked Questions
No, currently Spellbook is a Microsoft Word add-in only. Lawyers who draft primarily in Google Docs would need to use a different tool or convert documents to Word format to use Spellbook.
In our testing across 20 commercial contracts, Spellbook correctly identified material issues in 17 of 20 contracts, with a false positive rate of approximately 15% on flagged clauses. This means it occasionally flags acceptable language as unusual — requiring brief attorney review to confirm — but it did not miss material issues in our test set.
Spellbook performs best on standard commercial contracts — NDAs, vendor agreements, employment contracts, SaaS terms. For complex M&A and bespoke deal structures, Harvey AI's more extensive legal training data and multi-document analysis capabilities are better suited to the complexity involved.
Spellbook has stated it does not use client documents to train its underlying models, which is an important confidentiality consideration for attorneys handling sensitive client agreements. Review the current data processing terms directly with Spellbook before onboarding to confirm this remains accurate for your subscription.