AI Legal Tool Comparison 2026: Harvey AI, CoCounsel, Luminance and 7 More (Pricing & Free Plans)

When choosing an AI legal tool, many people are unsure about pricing structures, the availability of a free plan, and Japanese support. It is also important to accurately understand whether each tool works in a browser environment, as well as its strengths and limitations, for a successful implementation.

This article compares 10 major tools, from Harvey AI to Kira Systems, based on data published by AIpedia (as of November 2026). It neutrally organizes specific pricing plans, supported platforms, and the pros and cons of each tool. It also provides detailed recommendations by goal and tips on how to choose without making mistakes.

Needs range from automating contract review to legal research. Please review this along with the basic knowledge you should know before implementation. For the latest pricing and features, please check each tool's official website.

What Are AI Legal Tools? What They Can Do and What to Know Before Choosing

AI legal tools support the efficiency of legal work by automating contract reviews, detecting risk clauses, and accelerating legal research. For example, Harvey AI and Luminance enable automated contract analysis and due diligence, while Spellbook provides real-time correction suggestions within Microsoft Word. Additionally, LexisNexis+ AI and Westlaw Edge AI use AI to assist with case law search and citation analysis, and Ironclad AI and Juro AI digitize workflows from contract creation to management.

• Contract Review: Automatic detection of risk clauses and suggestion of revisions (e.g., Spellbook, LegalOn)
• Legal Research: Case law and statute search using natural language, and generation of answers with sources (e.g., CoCounsel, LexisNexis+ AI)
• Due Diligence: Automatic extraction of key clauses from large volumes of documents (e.g., Kira Systems, Luminance)
• Contract Management: Integrated management of creation, negotiation, signing, and approval (e.g., Ironclad AI, Juro AI)
• Document Drafting: Assistance in drafting litigation documents and contracts (e.g., Harvey AI, CoCounsel)

When selecting a tool, first check for Japanese support. According to data, Luminance offers partial support, while many other tools have no support or limited support (Note: LegalOn's data refers to its US-based service; it offers a separate service with Japanese support for Japan, as detailed later). It is also important to determine if individual use is permitted. Harvey AI and CoCounsel are intended for law firms and corporate legal departments, and individual use is not allowed.

Pricing models vary significantly. Spellbook has a clear pricing structure starting at $49/month, while Ironclad AI and Kira Systems are enterprise-focused and require custom quotes. Furthermore, it is advisable to confirm the usage environment before implementation, such as whether the tool works entirely in a browser or requires native apps for Windows or macOS.

Comparison of Top 10 Tools (Pricing, Japanese Support, Platforms)

Tool	AIpedia rating	Main plans	Japanese support	Platforms
Harvey AI	4.5	For enterprises (contact sales) / For law firms and corporate legal departments	Not supported	Web
CoCounsel	4.4	Custom quote for law firms and corporate legal / Add-on option to existing Westlaw contracts	Not supported	Web
Luminance	4.4	Custom quote / Supports both project-based and annual contracts / Free demo available	Partially supported	Web, API
Spellbook	4.4	Essential $49/user/month / Professional $99/user/month / Enterprise (contact sales)	Not supported	Web, Windows, macOS
Ironclad AI	4.3	Custom quote / Team, Business, and Enterprise plans / Free demo available	Not supported	Web, API
LexisNexis+ AI	4.3	Varies by plan (contact sales) / For law firms and corporate legal departments / Academic pricing available	Not supported	Web
Westlaw Edge AI	4.4	Usage-based pricing by plan (contact sales) / For law firms and corporate legal departments / Special pricing for academic institutions available	Not supported	Web
LegalOn	4.3	Essential, Professional, Enterprise (contact sales; free demo available)	Not supported	Web, Windows, macOS
Juro AI	4.2	Team plan / Business plan / Enterprise plan (all: contact sales)	Not supported	Web, API
Kira Systems	4.2	For enterprises (contact sales) / Annual licensing model	Not supported	Web

Ratings are out of 5 points, assigned by the AIpedia editorial team. Pricing and plans may change. Please check the official website of each tool for the latest information before signing a contract.

Features, Pricing, and Best For: 10 Tools

1. Harvey AI

Harvey AI is an AI platform specialized for the legal industry. It streamlines the intellectual work performed by lawyers, such as contract review and analysis, legal research, due diligence, and drafting litigation documents. Major law firms like Allen & Overy have adopted it.

• Strengths: It offers high specialization optimized for the legal domain. It is rated highly for its accuracy in contract analysis and risk detection.
• Strengths: It holds SOC 2 Type II certification and adopts a strict data policy that does not use client data for model training.
• Things to note: As an enterprise service, it is not available for individual use. Specific pricing is not disclosed.

Pricing: For enterprises (contact sales) / For law firms and corporate legal departments

Best for: Law firms and corporate legal departments looking to streamline contract review and due diligence. However, support for Japanese law is limited, so verification is required before use.

2. CoCounsel

CoCounsel is an AI legal assistant developed by Thomson Reuters. It streamlines tasks such as contract review, statutory research, and case law search. A key feature is its integration with Westlaw, the legal database operated by the company, which provides legal information with citations.

• Strengths: It connects directly to Westlaw data accumulated over more than 150 years. Because the AI references case law and statutes directly, you can obtain answers based on legal grounds.
• Strengths: When you upload a contract, it automatically identifies high-risk clauses and missing standard clauses. Analysis of documents with hundreds of pages is completed in minutes, significantly reducing manual work time.
• Strengths: Simply entering legal questions in natural language allows it to search for relevant case law and statutes and present them with summaries. It makes it easier to discover related information that might be hard to find via keyword search.
• Things to note: It is a subscription service for law firms and corporate legal departments. Individual use is not allowed, and it is often provided as an add-on option to existing Westlaw contracts.
• Things to note: It is based primarily on databases centered on US law and common law. Support for researching Japanese case law and statutes is limited, and it does not support Japanese.

Pricing: Custom quote for law firms and corporate legal / Add-on option to existing Westlaw contracts

Best for: Law firms and corporate legal departments conducting reviews of international contracts in English or research related to US law. However, always have a lawyer verify and validate AI outputs before use. Leave final legal judgments to experts.

3. Luminance

Luminance is a platform specialized for legal work that automates contract review, due diligence, and drafting with AI. It was developed by a company founded by machine learning researchers from the University of Cambridge and has been adopted by over 700 law firms and corporate legal departments in more than 60 countries worldwide.

• Strengths: With the Autopilot feature, AI autonomously detects risk clauses and performs comparisons against market standards as well as proposing revisions. A key characteristic is completing tasks that typically take lawyers several hours in just minutes.
• Strengths: It covers the entire contract lifecycle, from drafting to review, negotiation support, and management. Supporting over 80 languages, it is designed for easy use in cross-border cases.
• Strengths: It holds ISO 27001 and SOC 2 Type II certifications and supports on-premises deployment. A robust security framework is in place to safely process confidential legal documents.
• Things to note: Pricing is based on custom quotes, which may place it in the high-end enterprise tier. Support for Japan-specific contract practices is still developing.
• Things to note: Initial implementation requires a customization period, and the UI is primarily English-based. Japanese support is partial, so caution is needed for complex domestic cases.

Pricing: Custom quote / Supports both project-based and annual contracts / Free demo available

Best for: Ideal for legal departments handling large volumes of document reviews in M&A deals or requiring multilingual support. Recommended for companies with strict security requirements that want to operate in an on-premises environment, or organizations looking to streamline their contract management processes.

View detailed features, pricing, and FAQ for Luminance

4. Spellbook

Spellbook is an AI contract review tool that operates within Microsoft Word. It automatically analyzes clauses in real-time within Word and flags high-risk areas. It also allows for comparisons against market standards and automatic generation of clauses based on natural language instructions.

• Strengths: It operates seamlessly within Microsoft Word, making it easy to integrate into existing workflows.
• Strengths: Trained on millions of contract data points, the AI provides real-time warnings about unfavorable clauses and suggests revisions.
• Strengths: It holds SOC 2 Type II certification, ensuring reliability in security when processing confidential contract data.
• Things to note: It currently does not support Japanese contracts. It primarily targets English contracts, so separate expert input is required for analysis based on Japanese law.
• Things to note: Microsoft Word is required, and it cannot be used with other document editing tools like Google Docs.

Pricing: Essential $49/user/month / Professional $99/user/month / Enterprise (contact sales)

Best for: Suitable for legal professionals who frequently review English contracts, or business professionals looking to improve efficiency in a Word environment. However, analysis results are for reference only; please consult experts such as lawyers for final decisions.

5. Ironclad AI

Ironclad AI is a CLM (Contract Lifecycle Management) platform that centrally manages the entire process of contract creation, negotiation, approval, signing, and management through digital workflows. Released in 2024, "Ironclad AI Assist" provides features to summarize multi-page contracts into a few lines or highlight risk clauses. It also includes an AI Repository feature that allows users to check contract details simply by asking questions in natural language.

• Strengths: Features a workflow engine that allows you to build approval flows and conditional branches without code.
• Strengths: Integrates deeply with major business tools like Salesforce and DocuSign, enabling seamless connections from deal management to contract administration.
• Things to note: Does not support a Japanese UI, so it must be operated in an English environment.
• Things to note: Pricing is not public and targets enterprises. Implementation and initial setup require time and consulting.

Pricing: Custom quote / Team, Business, and Enterprise plans / Free demo available

Best for: Companies looking to streamline large-scale contract processes, or legal departments aiming to strengthen contract management by integrating with existing systems like Salesforce. However, small teams may find the features overwhelming. Please check the official website for the latest pricing and features.

View detailed features, pricing, and FAQ for Ironclad AI

6. LexisNexis+ AI

LexisNexis+ AI is an AI-powered legal research platform provided by LexisNexis, a subsidiary of RELX Group. It integrates a conversational search feature powered by generative AI with a database containing billions of legal documents and case law. Its key feature is generating answers with sources in response to natural language questions.

• Strengths: All AI responses include specific citations, such as case numbers and statutory provisions, making it easy to verify the basis of the information.
• Strengths: Implements automatic drafting of legal documents and a Timeline feature that organizes the chronology of complex cases.
• Strengths: Includes a Practical Guidance feature that provides checklists and templates required for specific legal procedures.
• Things to note: Pricing is high, which may present a significant barrier to adoption for small and mid-sized law firms.
• Things to note: Does not support Japanese, and coverage of Japanese law is limited.

Pricing: By plan (contact sales) / For law firms and corporate legal departments / Academic institution pricing available

Best for: Large law firms that frequently conduct extensive legal research, or corporate legal departments. It is suitable for users who can verify AI responses by checking sources rather than using them as-is.

7. Westlaw Edge AI

Westlaw Edge AI is a tool that integrates AI capabilities into "Westlaw," the legal research platform provided by Thomson Reuters. By combining AI technology with a database of case law and statutes accumulated over more than 100 years, it improves the accuracy and efficiency of legal research.

• Strengths: Features one of the world's largest databases covering US federal and state case law and statutes, offering high reliability.
• Strengths: Allows immediate verification of the current validity of cited cases through KeyCite citation analysis.
• Strengths: The AI-Assisted Research feature enables natural language search and systematically organizes and presents relevant materials.
• Things to note: Pricing is based on a per-plan usage-based model, but it tends to be very high, potentially placing a heavy burden on small firms.
• Things to note: Coverage of Japanese law is limited, with the database primarily focused on UK and US legal systems.

Pricing: Per-plan usage-based pricing (contact sales) / For law firms and corporate legal departments / Special pricing for academic institutions available

Best for: Law firms or corporate legal departments that prioritize research on UK and US law or verifying the validity of case law.

8. LegalOn

LegalOn is an AI contract review platform for corporate legal teams. It supports the entire process, from uploading contracts to clause analysis, risk assessment, and revision suggestions. Its standout feature is the "playbook functionality," which reflects organization-specific policies. Note that AIpedia's data (no Japanese support) covers US-based LegalOn information. The developer, LegalOn Technologies Inc., is a Japanese company that offers a service supporting Japanese contracts in Japan (LegalOn Cloud, formerly LegalForce).

• Strengths: You can train the AI on your organization's contract policies to achieve consistent automated reviews.
• Strengths: It supports over 100 contract types, including NDAs and SaaS agreements.
• Strengths: Classification by risk level clearly identifies areas that require priority attention.
• Things to note: In AIpedia's data (US-based LegalOn), support for Japanese contracts is limited. If you need to review Japanese contracts, please check the details of services targeted at Japan.
• Things to note: Initial setup effort for playbook configuration is required during implementation.

Pricing: There are three plans: Essential, Professional, and Enterprise. All require an inquiry for pricing. A free demo is available.

Best for: Legal teams that want to apply unified contract review standards across the organization. It works in Microsoft Word or via browser, and supports CRM integrations such as Salesforce. Please check the official website for the latest pricing and features.

9. Juro AI

Juro AI is a platform that allows you to handle everything from contract creation to management in the browser. It enables real-time collaborative editing without using Word files. Additionally, it leverages AI features to support the efficiency of contract operations.

• Strengths: The browser-native editor eliminates dependence on Word, allowing intuitive creation and negotiation of contracts.
• Strengths: The AI Assist feature enables automated contract reviews and natural language Q&A, making it easy for non-legal departments to use.
• Strengths: Self-service contracting allows business units to create and send standard contracts without going through legal, shortening the contract cycle.
• Things to note: Pricing is not publicly disclosed; an inquiry is required to confirm specific amounts.
• Things to note: Japanese support is limited. Also, other tools may be more suitable for advanced legal analysis or large-scale due diligence.

Pricing: Team plan / Business plan / Enterprise plan (all require an inquiry) / Free demo available

Best for: Businesses that prioritize speeding up contract operations and resolving bottlenecks in the legal department. It is particularly suitable when business units such as sales or HR want to proceed with contracts independently.

View detailed features, pricing, and FAQ for Juro AI

10. Kira Systems

Kira Systems is a contract AI analysis platform under Litera. It uses machine learning to automatically extract key clauses and risk factors from contracts. It features functions specifically designed to improve the efficiency of M&A due diligence work.

• Strengths: It features Built-in Models that automatically recognize hundreds of contract clauses. It also includes the Quick Study feature, which allows users to teach new patterns simply by providing examples.
• Strengths: It has extensive deployment experience with Big 4 accounting firms and international law firms. Integration with the Litera product suite enables coverage of the entire M&A lifecycle.
• Things to note: Because it uses an enterprise-oriented licensing model, it is not suitable for individuals or small firms. Support for Japanese contracts is also limited.

Pricing: For enterprises (contact sales) / Annual license

Best for: Companies and law firms that need to analyze and review large volumes of contracts in a short period. It is suitable for organizations with specialized knowledge and resources, such as those conducting M&A due diligence or compliance audits.

Recommendations by Goal

Goal	Recommended	Reason
Want to check features for free	Luminance, Ironclad AI	Both tools are listed as offering a free demo.
Want to review easily within Word	Spellbook	Runs on Microsoft Word and provides real-time risk identification and correction suggestions.
Want to manage the entire contract process	Ironclad AI, Juro AI	Digitalizes and centrally manages the lifecycle from creation to negotiation, signing, and administration.
Want to focus on M&A or due diligence	Kira Systems, Luminance	Strong at automatically extracting key clauses from large volumes of documents to streamline analysis tasks.
Want to enhance case law search or legal research	LexisNexis+ AI, Westlaw Edge AI	Provides natural language search capabilities combining large-scale legal databases with AI.
Want to review according to organizational policies	LegalOn	The playbook feature enables consistent reviews that reflect organization-specific contract policies.
Considering system integration or API usage	Luminance, Ironclad AI	APIs are explicitly listed in the supported environments, designed with integration into existing business systems in mind.
Want to streamline a wide range of legal tasks at a major firm using AI	Harvey AI	Supports contract analysis, legal research, due diligence, and drafting litigation documents with law-specific AI (for enterprises).
Want to research using Westlaw case law data	CoCounsel	Directly connected to the Westlaw database, providing answers with citations and contract reviews.

The above reflects general trends based on data. Specific features and pricing vary by tool. Please check the official website of each tool for the latest specifications and prices.

How to Choose Without Regrets

Clarify budget and pricing structure

Many tools use custom quote-based pricing for enterprises. While some offer plans starting at $49/month, such as Spellbook, costs can be high for individual use. Before implementation, check whether a free demo is available and verify the total cost, including initial fees, against your company's budget.

Japanese support and compliance with Japanese law

Many tools are designed primarily around US or UK law, so support for Japanese contracts is limited. Luminance supports over 80 languages, but its handling of practices specific to Japanese law is still developing. If you frequently handle cases under Japanese law, consult experts such as lawyers for final decisions.

Integration with existing workflows

Spellbook runs within Microsoft Word, allowing implementation without major changes to your existing work environment. In contrast, Ironclad AI and Juro AI include workflow management features, making them suitable if you aim to digitize the entire contract process. Ensure that the environments you use (browser, API, desktop app) align with your company's IT infrastructure.

Select features suited to your goals

If legal research is a priority, consider LexisNexis+ AI or Westlaw Edge AI. For contract review specialization, Spellbook or LegalOn are options. For general legal task assistance via AI, Harvey AI or CoCounsel are candidates. Kira Systems excels at clause extraction in M&A due diligence. Clearly define the business challenges you want to solve (research, review, management) and select the tool with features closest to those needs.

Security and data privacy

The legal industry has strict requirements for handling confidential information. Harvey AI holds SOC 2 Type II certification and provides a high level of security. However, you must thoroughly verify each tool's data handling policies and storage locations. Check the official website for the latest pricing, features, and security specifications.

FAQ

Q. Can individuals or small firms use these tools?

Harvey AI, CoCounsel, Ironclad AI, LexisNexis+ AI, Westlaw Edge AI, and Kira Systems are designed for enterprises or law firms and corporate legal departments. Therefore, they are not intended for use by individuals or small firms. Spellbook is available starting at $49/user/month, but this may be expensive for individual use.

Q. Are there tools that support Japanese contracts?

Luminance is listed as having "partial support" and supports over 80 languages. However, its handling of contract practices specific to Japanese law is still developing. The other nine tools are noted as not supporting Japanese or having limited support. Note that LegalOn’s developer is a Japanese company, and it offers services supporting Japanese contracts for the Japanese market (AIpedia’s data reflects information on LegalOn for the US market). If you need analysis based on the Japanese legal system, you should consult with an expert separately.

Q. Is it possible to try them for free?

Luminance, Ironclad AI, LegalOn, and Juro AI offer free demos. These tools use custom quotes or contact-for-pricing models, but demos are useful if you want to check the features first. The data for Harvey AI and CoCounsel does not list a free plan, so please check their official websites.

Q. How much do they cost?

Only Spellbook publishes specific pricing: Essential is $49/user/month, and Professional is $99/user/month. The other tools have undisclosed specific amounts, listed as "contact for pricing," "custom quote," or "for enterprises." Please check the official websites for the latest pricing and features.

Q. Which tool should I choose?

The right tool depends on your goal. For streamlining contract review, consider Spellbook or Luminance. For legal research, LexisNexis+ AI or Westlaw Edge AI are candidates. If you frequently handle M&A or due diligence, Kira Systems has a strong track record. We recommend starting with tools that offer free demos, based on your business workflows and budget.

Summary

This article compared 10 AI legal tools, including Harvey AI and CoCounsel. Many of these tools are enterprise-focused with non-public pricing. Additionally, support for Japanese law is often limited, so verification is required before implementation.

Each tool has different strengths. If you prioritize contract review, consider Spellbook or LegalOn. For large-scale due diligence, Kira Systems is a candidate. Choose the features that fit your company's workflow.

• Real-time contract review: Spellbook (runs in Word and provides immediate clause revision suggestions)
• Large-scale due diligence: Kira Systems (high accuracy in clause extraction using machine learning, suitable for processing large volumes of documents)
• Contract lifecycle management: Ironclad AI (completes creation, signing, and management on a single platform)