Spellbook vs Eve by Luminance: Contract AI Compared

Spellbook and Eve by Luminance both target contract work, but they're built for different scales. Spellbook is a $99/month Microsoft Word add-in for solo to mid-size transactional practices. Luminance is an enterprise platform with custom pricing for M&A-heavy firms and corporate legal departments. One lives in your existing workflow. The other replaces it.

Spellbook raised $20M+ and focuses on making contract drafting faster inside Word. Luminance raised $100M+ and built proprietary models specifically for contract understanding across 60+ languages. The comparison only makes sense if your firm is large enough that both are realistic options.

Feature Comparison

Spellbook operates as a Microsoft Word add-in offering contract drafting suggestions, a clause library, risk flagging, contract review with suggested edits, and custom playbook creation. It encodes your firm's preferred positions so the AI suggests YOUR standard clauses, not generic alternatives.

Eve by Luminance is a standalone platform for AI contract review and negotiation, autonomous contract generation, risk identification across entire portfolios, and M&A due diligence acceleration. It processes contracts in 60+ languages and uses proprietary models built specifically for contract understanding — not fine-tuned general models.

Pricing and Cost

Spellbook starts at $99/user/month with annual billing discounts available. Transparent pricing, no sales call required. A 5-attorney transactional team runs roughly $6,000/year.

Luminance uses enterprise pricing with custom deployment quotes. No public pricing. Expect significantly higher costs — enterprise contract AI platforms typically run $50K–200K+/year depending on firm size and document volume. Luminance requires a deployment and training period, adding implementation costs to the subscription.

Data Privacy and Compliance

Spellbook is SOC 2 Type II certified, does not train on client documents, and encrypts data at rest and in transit. Solid security for a mid-market tool.

Luminance offers enterprise-grade security with SOC 2 compliance and on-premise deployment options. For firms with strict data residency requirements, Luminance's on-premise option is a significant differentiator — your contract data never leaves your infrastructure.

Best For

Choose Spellbook if you're a solo practitioner, small, or mid-size transactional firm that drafts and reviews contracts in Microsoft Word. At $99/month, it's the most accessible contract AI on the market. The custom playbook feature makes it genuinely useful — it learns your firm's positions, not just generic contract language.

Choose Luminance if you handle high-volume M&A due diligence, multi-language contract portfolios, or need enterprise-grade contract intelligence across a large legal department. Luminance's proprietary models are genuinely better at contract understanding than general-purpose AI — but you need volume to justify the cost.

The Verdict

These tools serve different markets. Spellbook is the right choice for 90% of firms — it's affordable, integrates into existing workflows, and doesn't require changing how your team works. The custom playbook feature alone justifies the $99/month for any active transactional practice.

Luminance is the right choice for firms processing hundreds or thousands of contracts per deal — think BigLaw M&A practices and corporate legal departments managing global contract portfolios. If you're not sure which category you're in, you're in Spellbook's category.

The Bottom Line: Spellbook wins on accessibility and workflow integration for most firms at $99/month; Luminance wins for high-volume enterprise contract work where proprietary AI models and multi-language support justify the premium.