Spellbook
AI contract review and drafting tool that works directly inside Microsoft Word, flagging risky clauses and suggesting redlines as a lawyer reviews a document.
🔗 Visit Spellbook
Description
Reviewing a contract line by line — checking whether a clause is too aggressive, missing entirely, or different from what's normally acceptable — is exactly the kind of careful, repetitive reading work that eats up a lawyer's day. Spellbook adds an AI assistant directly inside Microsoft Word, the program lawyers already use to draft and review contracts, so it can flag risky language and suggest fixes right where the work already happens, instead of requiring a separate platform. Spellbook reviews and redlines contracts in Word, drafts new clauses or full sections from templates or past precedents, compares a contract against market-standard benchmarks, answers contract questions with citations ("Ask"), and lets a firm encode its own legal standards into reusable "Playbooks." It's used by 4,500+ legal teams across 80+ countries, including in-house teams at Dropbox, eBay and Crocs, and offers zero-data-retention agreements for firms with strict confidentiality requirements.
💬 Our review
The short version: Spellbook's core insight — meeting lawyers inside the Word document they're already working in, rather than asking them to switch to a new platform — is the single biggest reason it's reached 4,500+ legal teams, since adoption friction is the main thing that kills legal tech tools in practice.
The market-comparison feature (benchmarking a contract's terms against what's standard) is genuinely useful judgment support beyond simple error-flagging — it tells a lawyer not just "this clause looks off" but "here's how this compares to typical market terms," which is closer to what a senior colleague's review would add. "Playbooks" for encoding a firm's own standards is the feature that scales Spellbook from a personal assistant to an institutional tool, letting a legal team's collective judgment get applied consistently across many contracts rather than depending on whoever happens to be reviewing that day. The honest positioning versus Harvey: Spellbook is squarely a contract specialist tool, priced and scoped for small-to-mid-size legal teams and even solo practitioners (academic institutions get free access), while Harvey is a much broader legal-research-and-drafting platform aimed at the largest law firms (a majority of the Am Law 100) at a correspondingly larger price point and sales process. If your actual need is better, faster contract review specifically — not broad legal research across many practice areas — Spellbook is the more targeted and likely more affordable choice.
💰 Pricing
📊 Global score
🤖 AI-enriched data
Pros
Works directly inside Microsoft Word — no new platform to adopt
Benchmarks contract terms against market standards, not just flags errors
"Playbooks" encode a firm's own standards for consistent, institutional-level review
4,500+ legal teams across 80+ countries, named customers (Dropbox, eBay, Crocs)
Cons
Focused specifically on contracts, not broader legal research (unlike Harvey)
No public per-seat pricing — requires a sales conversation
Aggregate usage stats (10M+ contracts) aren't independently broken down by customer
❓ Frequently asked questions
- Do I need to learn a new platform to use Spellbook?
- No — it's built as an add-in directly inside Microsoft Word, so it works where lawyers already draft and review contracts rather than requiring a separate tool.
- Does it just flag errors, or help with judgment calls too?
- Both — beyond flagging risky or missing clauses, its market-comparison feature benchmarks a contract's terms against typical market standards, closer to a colleague's review than a simple spell-checker for legal language.
- What are "Playbooks"?
- A way to encode a firm's own legal standards and preferences into Spellbook, so reviews are consistent across the whole team rather than depending on whoever happens to review a given contract.
- Is it worth the money compared to alternatives?
- For contract-focused legal work specifically, yes — it's more targeted (and likely more affordable) than Harvey's broader legal-research platform. If your team needs research and drafting well beyond contracts, Harvey's wider scope may justify its larger price and enterprise sales process instead.
- Which tool should you pick for your case?
- Contract review and drafting specifically, for a small-to-mid legal team: Spellbook. Broad legal research and drafting across many practice areas at a large firm: Harvey.