Luminance vs Spellbook: which does AI recommend?

· ChatGPT Search and Google AI Mode

Based on every AI answer that names bothReviewed by

How we measure

AI summary

The answers treat and as equal picks for legal workflows, while is listed first more often when an answer names both.

Listed first when AI names both

LuminanceLuminance: 39%SpellbookSpellbook: 61% (Spellbook leads)

Recommended when named

LuminanceLuminance: 90% (Luminance leads)
SpellbookSpellbook: 80%

Warned against · lower is better

LuminanceLuminance: 2%
SpellbookSpellbook: 0%

Pick Spellbook for

  • Speeding up contract redlining Usually

Topic by topic

Mentioned in, as a share of each topic’s answers

Luminance named more2Spellbook named more2

Luminance named more

Spellbook named more

Only Luminance is ranked in3

Only Spellbook is ranked in7

What people ask AI about Luminance and Spellbook

is listed first slightly more often for corporate legal review and quick NDA review, and usually for speeding up redlining. is listed first more often for NLP analysis and unstructured PDF analysis.

Luminance listed firstSpellbook listed first
  1. What's the best AI tool for contract review at a corporate legal department?Leans Spellbook
  2. What's the best AI tool for reviewing a stack of NDAs quickly?Leans Spellbook
  3. Our contracts are getting stuck in legal review for weeks. Who offers AI contract review tools to speed up redlining?Spellbook usually first
  4. Our legal team needs AI to review vendor contracts against playbooks and escalate risky clauses. What tools are best?Spellbook often first
  5. I am looking for a "natural language processing" (NLP) tool for legal document analysis.Luminance often first
  6. What AI tools help in-house counsel search prior agreements and answer contract questions with citations?Spellbook often first
  7. We have terabytes of unstructured legal PDF contracts that we cannot search effectively. Who provides LLM-based document analysis tools?Luminance often first

Who AI mentions first

Luminance listed firstSpellbook listed first

is listed first every month.

  1. JunLuminance listed first: 43%Spellbook listed first: 57%
  2. JulLuminance listed first: 28%Spellbook listed first: 72%
  3. AugLuminance listed first: 42%Spellbook listed first: 58%
  4. SepLuminance listed first: 44%Spellbook listed first: 56%

ChatGPT Search lists first slightly more often, while Google AI Mode usually lists first.

  • ChatGPT SearchLuminance listed first: 46%Spellbook listed first: 54%
  • Google AI ModeLuminance listed first: 23%Spellbook listed first: 77%

Sources cited in the comparisons

Luminance favouredNeither favouredSpellbook favoured

Also named alongside Luminance and Spellbook

and appear in most of these answers, while appears in about half.

  1. Ironclad70%
  2. Harvey66%
  3. LegalOnTech59%
  4. Litera Kira15%
  5. LinkSquares13%
  6. Docusign11%
  7. Evisort11%
  8. Juro11%
  9. Thomson Reuters CoCounsel11%
  10. Icertis10%
  11. Robin AI9%
  12. goHeather7%

Luminance vs Spellbook: common questions

Is Luminance better than Spellbook?
The answers treat Luminance and Spellbook as equal picks for legal workflows, while Spellbook is listed first more often when an answer names both.
Do ChatGPT and Google AI Mode recommend Luminance or Spellbook?
ChatGPT Search lists Spellbook first slightly more often, while Google AI Mode usually lists Spellbook first.
What are the alternatives to Luminance and Spellbook?
Ironclad and Harvey appear in most of these answers, while LegalOnTech appears in about half.
When is Spellbook the better pick?
AI usually lists Spellbook first for: Speeding up contract redlining.

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