Luminance and Spellbook both work with contracts but solve different problems. Luminance is an enterprise contract analysis platform for diligence and large-scale review at AmLaw firms and global corporations. Spellbook is a Microsoft Word add-in for drafting and reviewing contracts inline, designed for individual transactional lawyers and small-to-mid-size firms. Comparing these is comparing a fleet truck to a car — different tools for different jobs.
Comparison updated: 2026/05/18
Start with workflow fit, then verify price and evidence before procurement.
Luminance works for AmLaw diligence teams, large legal departments, and any firm that regularly reviews 100+ contracts in a matter. The supervised + unsupervised AI hybrid handles novel contract types without extensive pre-training. Strong in UK and European markets.
Spellbook works for individual transactional lawyers and firms under 50 attorneys that draft contracts in Microsoft Word. Real-time clause suggestions and playbook enforcement integrate into the drafter's existing workflow.
Enterprise AI for portfolio-level contract analysis and institutional memory.
AI contract drafting and review inside Microsoft Word for transactional lawyers.
If you're doing diligence at scale, Luminance. If you're drafting and negotiating contracts in Word, Spellbook. These tools rarely compete head-to-head — firms that need both buy both.
Public source links are pending. Verify pricing, security, integrations, and product claims with each vendor before relying on this comparison.
Keep evaluating tools in the same topic or vendor shortlist before procurement.
Next decision paths
Use role-based and workflow pages to validate whether this comparison fits the legal work, team profile, and buying context.
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Scores use LawyerAI's 1–5 methodology and appear only after a dated editorial review. Some scores are not yet published.
| Feature | Luminance | Spellbook | Note |
|---|---|---|---|
| Microsoft Word native add-in | |||
| Enterprise contract diligence | |||
| Novel contract type handling (unsupervised AI) | |||
| Individual lawyer drafting | |||
| Playbook enforcement | Different scales | ||
| Solo / small-firm pricing | |||
| UK / European market presence | Luminance stronger | ||
| Enterprise scale diligence |
Luminance: enterprise pricing, custom quotes typically $50,000-150,000+/year. Spellbook: $99+/user/month individual; enterprise custom. Different orders of magnitude reflecting different scopes.
Pricing verification is pending. Treat figures as provisional and confirm them with each vendor.
Existing review summaries are withheld until their public source URLs are attached.
Luminance works for AmLaw diligence teams, large legal departments, and any firm that regularly reviews 100+ contracts in a matter. The supervised + unsupervised AI hybrid handles novel contract types without extensive pre-training. Strong in UK and European markets.
Spellbook works for individual transactional lawyers and firms under 50 attorneys that draft contracts in Microsoft Word. Real-time clause suggestions and playbook enforcement integrate into the drafter's existing workflow.