Spellbook review: AI contract review software built into Microsoft Word
Answer in brief: Spellbook is our #1 AI contract review software for 2026 because it puts the whole first pass inside Microsoft Word: review, redlines, comments, market benchmarks and reusable playbooks. Associate, an agent that works across multi-document matters, sits alongside the add-in. Spellbook says 5,000+ legal teams use it. It states SOC 2 Type II compliance and zero-data-retention agreements with its LLM providers. Pricing is per user by quote, with a 7-day free trial. It fits transactional lawyers and in-house teams; buyers who need heavy approval workflows should compare a CLM such as Ironclad.
Verdict: The fastest route from inbound contract to negotiation-ready redline for lawyers who live in Word. Ranked #1 of 13 in our AI contract review software ranking.
Independent research: compiled from Spellbook's own website and public sources as of November 9, 2026. We have not tested the product hands-on.
Your second set of eyes, right inside the document
Spellbook's Review feature scans an entire contract for client risks, drafting errors and other issues, then proposes redlines and comments. You choose which suggestions to approve, and you can bulk-approve several changes at once. Edits appear under your own name, so a redlined draft can go straight to a client or counterparty. Spellbook says it learns your preferences and recommends redlines that favor your side.
The full suite, as listed on Spellbook's pricing page:
- Review: issue spotting and precise redlines in Word.
- Draft: new clauses, full agreements and revisions, written from scratch or from your saved precedents.
- Ask: quick answers to complex questions about the document.
- Benchmarks / Market: compares terms against industry standards.
- Playbooks: saves your team's review instructions so they are applied on every review.
- Associate: an agent that works through multi-document legal matters under your oversight.
Spellbook also markets intake that pulls contracts in from email and Slack and runs a first-pass review. It describes a repository where signed contracts are stored, searchable and monitored for renewals and new risks.
Who Spellbook fits best
- Transactional lawyers at small, mid-size and larger law firms.
- In-house legal teams that negotiate supplier, customer and vendor paper in Word. The in-house plan includes a Playbook Build Service.
- Law schools and students: Spellbook offers free access to academic institutions.
Why lawyers pick it: the strengths
- Zero change in workflow. Review happens in Word, the tool lawyers already use for every redline.
- Standards that compound. Playbooks turn your team's positions into automated checklists enforced on every review.
- Security your IT team will ask about: SOC 2 Type II, HIPAA, GDPR and EU AI Act listed; zero data retention, so LLM providers do not train on or store your data; SSO, MFA, encryption and audit controls.
- Easy to trial. 7 days free, with extended trials possible for larger organizations.
Honest drawbacks
- No public dollar price, so you need a demo to get a number.
- Intake and the repository are newer than the Word add-in. Teams that need mature approval chains, e-signature and obligation workflows may still need a CLM alongside it.
- Like every tool here, its output needs lawyer review before anything goes out.
Pricing model
Spellbook says its pricing depends on the number of team members on your license. It publishes two packages: Law Firms (Spellbook Suite, group training, online support, dedicated support for teams over 10) and In-House Teams (Spellbook Suite, team training, Playbook Build Service, dedicated support for teams over 10). There is a 7-day free trial and free academic access. See our pricing comparison.
Who uses Spellbook
Spellbook's site features customer stories from Panasonic, Alturas Capital Partners, Elevare Law, Dropbox, AtkinsRéalis, NEAR Foundation and CunninghamLegal. Spellbook says 5,000+ legal teams use it (vendor figure).
Best alternatives to Spellbook
- Gavel Exec: also Word-native, with a published $160 per user per month price and 25 free queries.
- LegalOn: for in-house teams that want 135+ attorney-built playbooks on day one.
- Harvey: for large firms that want contract review inside a broad legal AI platform.
Spellbook FAQ
Does Spellbook work inside Microsoft Word?
Yes. Spellbook's Review, Draft, Ask, Benchmarks and Playbooks features run as a Microsoft Word add-in, and Associate handles multi-document work.
How much does Spellbook cost?
Spellbook does not publish a dollar price. It prices by the number of team members on the license and offers a 7-day free trial.
Does Spellbook train AI on my contracts?
Spellbook says its zero-data-retention agreements mean its LLM providers never learn from, train on or store your data.
Is Spellbook free for students?
Spellbook offers free access to academic institutions through its academic partnerships.