Harvey vs. LegalOn: Which Legal AI Platform Fits Your Workflow?

Harvey and LegalOn both support AI-assisted legal work, but their platforms emphasize different parts of the legal workflow.

Harvey spans legal research, drafting, document analysis, knowledge, contracts, and multi-step AI workflows for law firms and legal departments. LegalOn is built more closely around in-house legal work, combining contract review with Playbooks, drafting, matter intake and management, contract intelligence, and legal assistance.

This guide compares the two platforms across legal research, contract review, Playbooks, Microsoft Word, security, pricing, and in-house legal workflows.

Key Takeaways

• Harvey spans a broader range of legal work, including research, drafting, document analysis, organizational knowledge, contracts, and multi-step AI workflows.
• LegalOn emphasizes in-house contracting and legal operations, with contract review, attorney-built and custom Playbooks, Matter Management, intake, and contract intelligence.
• Both platforms support Microsoft Word, but their research and contract-review models differ.
• Neither publishes a standard dollar price. LegalOn uses customized per-seat pricing based on team size and capabilities and offers a 14-day free trial with onboarding included.

[cta-1]

What Is Harvey?

Harvey is a legal AI platform designed to support work across research, drafting, document analysis, organizational knowledge, contracts, and multi-step workflows.

The Harvey platform includes Vault for organizing and analyzing legal documents, Knowledge for legal, regulatory, and tax research, Workflows for repeatable processes, and agentic functionality for longer legal tasks. In an agentic workflow the tool carries out a sequence of steps on its own before returning the result for a lawyer to review. Harvey also works with tools including Microsoft Word, Outlook, iManage, SharePoint, Google Drive, and other legal and enterprise systems.

Harvey Legal Research

Harvey runs legal research against external sources alongside a team's own documents. Ask LexisNexis provides citation-backed answers grounded in LexisNexis U.S. primary law. Harvey Knowledge adds a pipeline into more than 500 legal sources across jurisdictions.

That research can sit alongside internal documents, drafting, and broader legal analysis rather than operating as a separate research-only workflow.

Research coverage is not uniform across jurisdictions. The Ask LexisNexis integration reaches U.S. primary law, and questions outside the United States run through the Knowledge sources instead.

Harvey Contract Review

Harvey Contract Intelligence connects contract intake, Playbooks, precedent benchmarking, portfolio insights, obligations, and key dates.

The Contract Review Agents can use executed agreements to compare current negotiating positions with prior deals and identify where review standards may need to change. Custom Contract Review Agents are currently in early access, so a team evaluating Harvey today works with Harvey's account team to build review standards rather than configuring its own agents in the product.

What Is LegalOn?

LegalOn is an AI platform for in-house legal teams covering contract review, drafting, legal assistance, matter management, intake, and post-signature contract intelligence.

The LegalOn platform extends from active contract review into Matter Management and Vault. Vault turns executed agreements into searchable contract intelligence, while LegalOn's matter workflows support intake, triage, workload tracking, and reuse of information from past matters.

LegalOn Contract Review

LegalOn reviews and redlines contracts against both pre-built and custom Playbooks.

The Playbook library contains more than 135 attorney-built Playbooks. The Core Review plan includes that 135+ pre-built library, while the Contracting Suite adds My Playbooks for custom standards and Playbook Agent, which converts existing templates, guidelines, or prior redlines into AI-ready Playbooks.

LegalOn also supports direct editing in Microsoft Word, which lets lawyers preview AI-generated changes and apply approved redlines to the document as native Track Changes.

The pre-built Playbooks are a starting position rather than a finished standard, so a team still reviews them against its own risk tolerances before relying on the redlines they produce.

LegalOn Legal Assistance

LegalOn extends beyond contract review through the Legal AI Assistant and more than 100 Prompt Workflows for everyday legal tasks.

These workflows cover activities such as summarization, drafting, extraction, and translation. Vault and Matter Management add organizational context from contracts and past matters.

The Prompt Workflows are attorney-built templates for recurring tasks rather than a research database, so a lawyer checks each output against primary sources before relying on it.

Harvey vs. LegalOn at a Glance

[cta-2]

What Are the Main Differences Between Harvey and LegalOn?

1. Harvey Covers a Broader Range of Legal Work

Harvey connects legal research, drafting, document analysis, organizational knowledge, contracts, and longer multi-step workflows in one platform.

The agentic capabilities can carry out multi-step tasks across practice areas, with outputs reviewed by a lawyer before they are used. Vault, Knowledge, Workflows, and Contract Intelligence support different stages of legal work.

LegalOn has also expanded beyond contract review, but the platform remains more closely organized around the in-house legal workday: agreements, matters, intake, contract intelligence, and recurring legal workflows.

2. Their Contract-Review Standards Come From Different Sources

Both platforms can apply a team's own standards.

LegalOn combines custom standards with a ready-made Playbook library, which can give teams predefined review positions before they have documented every internal rule themselves.

Harvey places more emphasis on the organization's own Playbooks, precedents, and executed deal history. Contract Intelligence can compare a current negotiation with positions accepted in previous agreements and use that information to inform future review standards.

3. Their Research Workflows Differ

Harvey runs an explicit external legal-research layer, combining licensed U.S. primary law through Ask LexisNexis with more than 500 legal sources across jurisdictions through Knowledge.

The LegalOn Assistant provides sourced answers for research-oriented tasks, alongside contracts, matters, and organizational knowledge.

4. Both Work Inside Microsoft Word in Different Ways

Harvey and LegalOn both run inside Microsoft Word, and both work on the document a lawyer already has open.

The Harvey add-in covers drafting and editing, Playbook reviews, full-document editing, and answers about the open document, so the same assistant tool a firm uses elsewhere in Harvey is available next to the draft. The Playbooks the add-in reviews against are the ones the organization has built from its own precedents.

The LegalOn add-in is organized around contract review. It previews AI-generated redlines before they are applied and inserts approved edits as native Track Changes, with undo and manual editing available afterwards.

Neither add-in works unattended. Both surface suggested language that a lawyer accepts, edits, or rejects, and the decision about whether a proposed position is acceptable stays with the reviewer.

5. Their Contract-Intelligence Workflows Differ

Harvey Contract Intelligence combines intake, review, Playbooks, precedent benchmarking, obligations, key dates, and portfolio insights. The benchmarking focuses on the organization's own executed agreements and negotiation history.

LegalOn Vault turns signed agreements into searchable information about terms, obligations, renewals, and other contract data. Vault Projects adds structured analysis across contract sets.

How Do Harvey and LegalOn Compare on Security?

Both platforms publish enterprise security controls and independent assurance information.

Harvey maintains SOC 2 Type II and ISO 27001, along with ISO 27701 for privacy information management and ISO 42001 for AI management systems. Harvey does not use customer inputs, outputs, or uploaded documents to train underlying models, and it contractually prohibits model providers from using customer data for training.

LegalOn is SOC 2 Type II certified and holds ISO 27001 and ISO 27017 certifications. LegalOn does not use customer contract data to train its AI models.

LegalOn also offers dedicated data residency in the European Union and Singapore, with application servers and databases maintained in region.

Neither security page publishes subprocessor lists, retention terms, or a data processing agreement. Both vendors maintain a separate trust portal, where that documentation is available on request during an evaluation.

How Do Harvey and LegalOn Compare on Pricing?

Neither Harvey nor LegalOn publishes a standard dollar price that supports a simple per-seat comparison.

Harvey directs prospective customers through a demo and sales-led evaluation rather than publishing a standard public price.

LegalOn uses per-seat pricing quoted based on team size and the capabilities selected. The LegalOn packages include Core Review, Contracting Suite, and Productivity Suite. LegalOn also offers a 14-day free trial with onboarding included.

Total cost depends on the users, capabilities, sources, integrations, deployment requirements, and commercial terms included in the agreement.

Where Spellbook Fits

Spellbook is centered on commercial contract review and negotiation inside Microsoft Word. Review supports custom Playbooks, proposed redlines and comments, and lawyer approval of changes.

Compare to Market adds external contract-market context by comparing terms against data from thousands of similar agreements, with filters including industry, jurisdiction, and deal type.

Spellbook also supports multi-document transactional work through Associate and citation-backed legal research through Legal Data Sources, which connects to more than 1,000 public legal databases.

The Review and Compare to Market features are built around commercial contracts in Microsoft Word, a narrower surface than either platform compared here.

Harvey and LegalOn Take Different Approaches to Legal AI

Harvey and LegalOn overlap across contract review, drafting, Microsoft Word, and legal assistance, but their broader platforms are organized differently.

Harvey extends further across research, knowledge, document analysis, and agents. LegalOn extends contract review into matters, intake, triage, and contract intelligence for in-house teams.

How We Compared These Platforms

This comparison uses seven dimensions:

• Legal research: what each platform searches, and whose sources it cites.
• Contract review: how each platform runs a review, and what it returns.
• Playbooks: where review standards come from, and who writes them.
• Microsoft Word: what each add-in does inside an open document.
• Security: certifications, model-training commitments, and data residency.
• Pricing: the commercial model, the packages, and trial availability.
• In-house legal workflows: matters, intake, triage, and post-signature contract data.

Product capabilities, certifications, availability, and commercial terms are based on current first-party information from Harvey and LegalOn as of September 2026.

[cta-3]

Frequently Asked Questions

Do Harvey and LegalOn Both Support Legal Research?

Both support research-oriented legal work, but their workflows differ. Harvey provides Ask LexisNexis, the Knowledge product, and more than 500 legal sources across jurisdictions. LegalOn combines the Legal AI Assistant with sourced responses, reusable legal workflows, and organizational context. The main difference is the source coverage, jurisdictions, and citation workflows available through each platform.

How Do Their Contract-Review Workflows Differ?

Both can review contracts against organizational standards and support work in Microsoft Word. LegalOn combines custom Playbooks with a ready-made attorney-built library. Harvey places greater emphasis on organizational Playbooks, precedent, executed agreements, and negotiation history through Contract Intelligence.