Spellbook

AI contract drafting and review directly inside Microsoft Word

Luminance

AI contract intelligence platform

Spellbook

Moderate

15/25

Luminance

Excellent

23/25

Score Breakdown

DimensionSpellbookLuminance

Data Residency

Where is your data stored and processed?

Spellbook: Data processed in US and Canada. Zero retention policy with OpenAI API prevents document storage for AI training. Limited EU data residency options may concern European law firms.

Luminance: UK/EU hosting with customer choice; on-premise available

3/5

Data processed in US and Canada. Zero retention policy with OpenAI API prevents document storage for AI training. Limited EU data residency options may concern European law firms.

5/5

UK/EU hosting with customer choice; on-premise available

Legal Jurisdiction

Which laws govern the company and your data?

Spellbook: Incorporated in Ontario, Canada. Canadian privacy law (PIPEDA) provides reasonable protections. Canadian jurisdiction is generally considered acceptable for legal professionals handling confidential client data.

Luminance: UK-incorporated company under English law

3/5

Incorporated in Ontario, Canada. Canadian privacy law (PIPEDA) provides reasonable protections. Canadian jurisdiction is generally considered acceptable for legal professionals handling confidential client data.

5/5

UK-incorporated company under English law

Data Retention & Training

Is your data used for model training?

Spellbook: Strong data minimisation posture with zero data retention policy through OpenAI's API. Documents are not stored beyond the session, reducing exposure of sensitive legal content.

Luminance: Zero data used for training; complete client data isolation

4/5

Strong data minimisation posture with zero data retention policy through OpenAI's API. Documents are not stored beyond the session, reducing exposure of sensitive legal content.

5/5

Zero data used for training; complete client data isolation

Certifications

ISO 27001, SOC 2, Cyber Essentials, etc.

Spellbook: Holds SOC 2 Type II certification. Certification portfolio is limited for a tool handling highly sensitive legal documents; ISO 27001 certification would strengthen the trust posture.

Luminance: SOC 2 Type II, ISO 27001, Cyber Essentials Plus

2/5

Holds SOC 2 Type II certification. Certification portfolio is limited for a tool handling highly sensitive legal documents; ISO 27001 certification would strengthen the trust posture.

4/5

SOC 2 Type II, ISO 27001, Cyber Essentials Plus

Regulatory Fit

Suitability for regulated industries and professional services

Spellbook: Good fit for North American law firms and corporate legal departments. Zero data retention aligns with attorney-client privilege requirements. Limited certifications may require additional due diligence for EU or highly regulated clients.

Luminance: SRA and FCA suitable; used by regulated law firms and financial institutions

3/5

Good fit for North American law firms and corporate legal departments. Zero data retention aligns with attorney-client privilege requirements. Limited certifications may require additional due diligence for EU or highly regulated clients.

4/5

SRA and FCA suitable; used by regulated law firms and financial institutions

Total Score

15/25

23/25

Best For

Spellbook

Best for EU-headquartered organisations needing maximum data sovereignty; organisations requiring broad certification coverage (SOC 2 Type II, ISO 27001, Cyber Essentials Plus); regulated industries (SRA, FCA); privacy-conscious teams who need strong data retention controls; organisations that need self-hosted or on-premise deployment.

Luminance

Best for privacy-conscious teams who need strong data retention controls.

Detailed Comparison

Luminance vs Spellbook: Trust & Compliance Comparison

Luminance (Luminance Technologies Ltd, GB) scores 23/25 overall with a Gold (Excellent) trust badge. AI contract intelligence platform. Spellbook (Rally Legal, CA) scores 15/25 with a Bronze (Moderate) trust badge. AI contract drafting and review directly inside Microsoft Word.

Dimension-by-Dimension Breakdown

#### Data Residency

Luminance leads with 5/5 vs 3/5.

●Luminance (5/5): UK/EU hosting with customer choice; on-premise available

●Spellbook (3/5): Data processed in US and Canada. Zero retention policy with OpenAI API prevents document storage for AI training. Limited EU data residency options may concern European law firms.

#### Legal Jurisdiction

Luminance leads with 5/5 vs 3/5.

●Luminance (5/5): UK-incorporated company under English law

●Spellbook (3/5): Incorporated in Ontario, Canada. Canadian privacy law (PIPEDA) provides reasonable protections. Canadian jurisdiction is generally considered acceptable for legal professionals handling confidential client data.

#### Data Retention & Training

Luminance leads with 5/5 vs 4/5.

●Luminance (5/5): Zero data used for training; complete client data isolation

●Spellbook (4/5): Strong data minimisation posture with zero data retention policy through OpenAI's API. Documents are not stored beyond the session, reducing exposure of sensitive legal content.

#### Certifications

Luminance leads with 4/5 vs 2/5.

●Luminance (4/5): SOC 2 Type II, ISO 27001, Cyber Essentials Plus

●Spellbook (2/5): Holds SOC 2 Type II certification. Certification portfolio is limited for a tool handling highly sensitive legal documents; ISO 27001 certification would strengthen the trust posture.

#### Regulatory Fit

Luminance leads with 4/5 vs 3/5.

●Luminance (4/5): SRA and FCA suitable; used by regulated law firms and financial institutions

●Spellbook (3/5): Good fit for North American law firms and corporate legal departments. Zero data retention aligns with attorney-client privilege requirements. Limited certifications may require additional due diligence for EU or highly regulated clients.

Certifications at a Glance

Certification	Luminance	Spellbook
Cyber Essentials Plus	Yes	No
ISO 27001	Yes	No
SOC 2 Type II	Yes	Yes

Overall Verdict

Luminance has a clear trust advantage, scoring 23/25 compared to Spellbook's 15/25. Luminance particularly excels in data residency, legal jurisdiction, data retention & training, certifications, regulatory fit.

Frequently Asked Questions

Which is better for EU compliance, Spellbook or Luminance?

Spellbook has a TrustKit score of 15/25 while Luminance scores 23/25. Luminance currently rates higher across data residency, legal jurisdiction, data retention, certifications, and regulatory fit.

How do Spellbook and Luminance compare on data residency?

Spellbook scores 3/5 for data residency (Data processed in US and Canada. Zero retention policy with OpenAI API prevents document storage for AI training. Limited EU data residency options may concern European law firms.), while Luminance scores 5/5 (UK/EU hosting with customer choice; on-premise available).

Are Spellbook and Luminance GDPR compliant?

Both tools are assessed across five compliance dimensions. Spellbook has a regulatory fit score of 3/5 and Luminance scores 4/5. Check the full comparison above for a detailed breakdown.

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