What is the best AI contract review software in 2026?
Last updated: November 9, 2026
For most lawyers who review contracts in Microsoft Word, the best AI contract review software in 2026 is Spellbook; for in-house teams that want attorney-built playbooks on day one, it is LegalOn. Enterprises that need review inside a full contract lifecycle platform should shortlist Ironclad and Luminance, while large law firms doing broad legal work and due diligence should look at Harvey and Kira by Litera.
There is no single winner for every buyer: Word add-ins, contract lifecycle management (CLM) suites and due-diligence engines solve different problems. The ranking below weighs how well each product does pre-signature AI review (issue spotting, playbooks, redlines) for the audience it serves. We have not tested these products hands-on; see our methodology.
The ranked list
1. Spellbook
What it is: An AI suite for drafting and reviewing contracts. It consists of a Microsoft Word add-in (Review, Draft, Ask, Benchmarks, Playbooks) and Associate, an agent that works across multi-document matters. Spellbook now also markets intake from email and Slack and a repository that monitors signed contracts.
Best for: Transactional lawyers, small and mid-size law firms, and in-house teams that live in Word.
Strengths: Review and redlining happen inside the document lawyers already use. Playbooks can be reused. Benchmarks compare terms against market language. Spellbook states it has zero-data-retention agreements with its LLM providers and SOC 2 Type II compliance, and that it is used by 5,000+ legal teams (vendor figure).
Drawbacks: No public dollar price. The repository and workflow features are newer than the Word add-in, so teams needing mature approvals and obligation tracking may still need a CLM.
Pricing: Custom, priced by the number of users on the license; 7-day free trial; free access for academic institutions.
Official site: spellbook.com
2. LegalOn
What it is: An AI legal platform for in-house teams. It covers review and redlining in Word or on the web, an AI Assistant, Vault (a repository of signed contracts), matter management, and intake and triage agents.
Best for: In-house legal teams, from a solo GC to a global department, that want defensible review positions before writing their own playbooks.
Strengths: 135+ attorney-built playbooks covering NDAs, MSAs, DPAs and more across dozens of countries, maintained as the law changes. Custom playbooks and a Playbook Agent that builds playbooks from your precedents. LegalOn advertises unlimited usage on its plans, and says customer data is never used to train third-party foundation models.
Drawbacks: No public dollar pricing. Custom playbooks and the Vault repository require the higher Contracting Suite tier. The product is aimed at in-house work, not law-firm diligence.
Pricing: Quote-based tiers: Core Review, Contracting Suite and Productivity Suite, plus add-ons.
Official site: legalontech.com
3. Ironclad
What it is: An AI contract lifecycle management (CLM) platform. Ironclad Agent and specialized agents, including a Contract Review Agent, work inside intake, approval, signature, repository and renewal workflows.
Best for: Mid-market and enterprise legal, legal ops, procurement and sales teams that want review embedded in one end-to-end contracting system.
Strengths: AI playbooks and review run inside live workflows. Integrations include Salesforce and Coupa, and MCP connectors are available. Ironclad states zero data retention, BYOK encryption, ISO 27001 and SOC 2 Type II. It reports being named a Leader in the 2025 Gartner Magic Quadrant for CLM and the Forrester Wave Q1 2025 (vendor-reported).
Drawbacks: Implementing a full CLM is a bigger project than installing a Word add-in. It is overkill if you only need first-pass redlining. No public pricing.
Pricing: Quote only, via demo.
Official site: ironcladapp.com
4. Luminance
What it is: A contract intelligence platform founded by University of Cambridge researchers. It has three modules: Discover (portfolio risk and obligations), Negotiate (playbook- and precedent-driven review) and Automate (workflows from intake to signature).
Best for: Large enterprises and legal teams that need high-volume review plus portfolio-wide visibility for legal, procurement and finance.
Strengths: Brings both precedent and playbooks into negotiations, and analyzes the whole contract portfolio rather than one document at a time. Luminance says it is trusted by 1,000+ enterprises (vendor figure).
Drawbacks: Enterprise sales motion with no public pricing. Smaller teams may not need the portfolio features.
Pricing: Custom, demo-led.
Official site: luminance.com
5. Harvey
What it is: A broad legal AI platform with agents, Vault (bulk document analysis), Spaces, and a Contract Intelligence product. Contract Intelligence covers intake, Contract Review Agents, playbooks, precedent benchmarking, and tracking of obligations and key dates.
Best for: Large law firms and enterprise legal departments that want contract review as part of a wider legal AI deployment.
Strengths: Reviews are grounded in your playbooks and precedents, and Harvey recommends when to update a playbook based on how executed deals actually moved. Strong security attestations (SOC 2 Type II, ISO 27001, ISO 42001 and others). Harvey says 3,500+ legal organizations use it (vendor figure).
Drawbacks: It is a general legal platform, not a full CLM. Pricing is not public, and third-party reports describe it as a premium enterprise purchase. It is likely too much for a solo practitioner.
Pricing: Quote only, via sales.
Official site: harvey.ai
6. Kira by Litera
What it is: Litera's contract-analysis engine for high-volume, high-stakes review and due diligence. It combines predictive extraction with generative AI, and comes paired with Lito, a diligence assistant.
Best for: M&A, real estate and finance diligence teams at law firms and corporate development groups.
Strengths: 1,400+ pre-built smart fields plus fields you train yourself. Collaborative review grids, and cross-document Q&A (Grid Chat) with answers cited to source documents. Lito is included for Kira customers at no extra charge. Litera claims 95%+ precision on target provisions (vendor claim).
Drawbacks: Built for extraction across many documents, not for redlining a single inbound agreement in Word. No public pricing.
Pricing: Custom enterprise quote.
Official site: litera.com
7. Juro
What it is: An AI-native contracting platform that covers templates, AI review and redlining (including in Word), approvals, e-signature, and an intelligent repository with Operator, a conversational AI.
Best for: Small and mid-size in-house teams that want business users to self-serve on contracts within legal-controlled guardrails.
Strengths: The AI review agent redlines against playbooks you control. Embedded integrations with CRM and ATS tools. SOC 2 Type 2 certified. Juro says it offers zero-retention APIs.
Drawbacks: No public prices. It is a full platform, so teams that only want a review add-in may be paying for features they won't use.
Pricing: Custom plan built around features, support needs and integrations.
Official site: juro.com
8. Gavel Exec
What it is: Gavel's AI contract review and drafting tool for Microsoft Word and the web. It produces first-pass reviews, redlines, clause drafting, playbooks and market benchmarking. Gavel was acquired by Relativity in June 2026.
Best for: Solo attorneys and small firms that want a transparent, self-serve price.
Strengths: One of the few tools here with a published price and a free start (25 free queries per user, no credit card). Redlines are priority-ranked. SOC 2 Type II certified.
Drawbacks: Paid plans are capped at 1,000 completions per month. Following the Relativity acquisition, the product's direction may shift toward the RelativityOne ecosystem.
Pricing: $160 per user per month, or $1,740 per user billed annually. Team pricing is available for 10+ seats.
Official site: gavel.io
9. LinkSquares
What it is: An analytics-first AI contract management platform. It combines an AI Legal Assistant for drafting, review and analysis, a Word add-in for AI redlining, and modules for contract intelligence, renewals and obligations, and reporting.
Best for: Legal, finance and procurement teams that care as much about post-signature reporting as about review.
Strengths: Answers cite their sources. Strong repository and renewal visibility. A Salesforce workflow lets sales teams self-serve.
Drawbacks: Quote-only pricing. Review is one part of a broader CLM, so buyers who only want a review tool may find it heavy.
Pricing: Sales-quoted.
Official site: linksquares.com
10. LegalSifter ReviewPro
What it is: A Microsoft Word product that reviews contracts against customizable playbooks, flags missing or risky language, and can generate redlines automatically. It is backed by optional lawyer-led playbook and redlining services.
Best for: Organizations that want AI review plus human services, such as healthcare or procurement teams with overflow volume.
Strengths: Redlines can be filtered by high, medium or low importance. Auto-redlining can be switched off so you get issue flagging only. Reviews contracts in other languages. LegalSifter reports its 'Sifter' clause models improved from about 90% to over 97% F1 (vendor-reported).
Drawbacks: Works only in Microsoft Word. Its redlining services require supervising counsel. Its separate Control product does not use AI extraction.
Pricing: Free trial available; pricing by sales contact.
Official site: legalsifter.com
11. Sirion
What it is: An AI-native enterprise CLM. Its review features detect deviations from preferred positions, assign risk categories, explain issues in plain language and give redlining guidance, from single contracts up to bulk review.
Best for: Large enterprises with complex buy-side and sell-side contract estates, especially procurement-heavy ones.
Strengths: Playbook-driven review that scales to bulk volumes. Context-aware redlining with Microsoft Word collaboration. A majority investment from Haveli completed in February 2026.
Drawbacks: Enterprise-scale implementation and no public pricing. We could not read Sirion's site directly (our automated reader was blocked), so these details come from Sirion's own pages as relayed by our search tool.
Pricing: Quote only.
Official site: sirion.ai
12. Docusign Iris (AI contract review assistant)
What it is: Docusign's agreement AI. A conversational contract review assistant launched in March 2026 highlights terms, risks and deviations from company standards, suggests redlines, compares agreements against playbooks and drafts playbooks from reference documents. It builds on Docusign's 2024 acquisition of Lexion.
Best for: Organizations already standardized on Docusign CLM or Intelligent Agreement Management (IAM).
Strengths: Review, signature, obligations and renewals in one vendor's platform. Supports English, French, German, Spanish and Brazilian Portuguese.
Drawbacks: Docusign says the features are available to Docusign CLM and selected IAM customers, not to every eSignature account. Less specialized for law firms.
Pricing: IAM plans are listed on Docusign's plans page; review capabilities depend on your entitlement, so contact sales.
Official site: docusign.com
13. Leah (formerly ContractPodAi)
What it is: An enterprise agentic AI platform for CLM, legal, procurement and finance. Its agents handle intake, drafting, playbook review, redlining, approval routing and obligation tracking, under approval rules you define. The contractpodai.com domain now redirects to leahai.com.
Best for: Large enterprises that want contract review connected to procurement and finance workflows.
Strengths: Broad cross-functional scope, with permissions, approvals and an action record built in.
Drawbacks: The broad agentic positioning makes it more than a review tool. No public pricing, and an enterprise implementation.
Pricing: Quote only.
Official site: leahai.com
Comparison table
| # | Product | Category | Best for | Where review happens | Public price? |
|---|---|---|---|---|---|
| 1 | Spellbook | Word-native review & drafting | Law firms, in-house | Word add-in, Associate agent | No (per-user quote; 7-day trial) |
| 2 | LegalOn | Review platform + playbooks | In-house legal | Word add-in, web app | No (3 quoted tiers) |
| 3 | Ironclad | AI CLM | Enterprise | CLM workflows, agents | No |
| 4 | Luminance | Contract intelligence | Enterprise, high volume | Luminance platform | No |
| 5 | Harvey | Broad legal AI | Large firms, enterprise legal | Harvey platform | No |
| 6 | Kira by Litera | Due-diligence extraction | M&A and diligence teams | Review grids, Microsoft 365 | No |
| 7 | Juro | AI-native CLM | SMB and mid-market in-house | Juro editor, Word | No (custom plan) |
| 8 | Gavel Exec | Word-native review | Solos, small firms | Word, web | Yes: $160/user/mo |
| 9 | LinkSquares | Analytics-first CLM | Legal + finance + procurement | Platform, Word add-in | No |
| 10 | LegalSifter ReviewPro | Word review + services | Teams wanting human backup | Word only | No (free trial) |
| 11 | Sirion | Enterprise CLM | Complex enterprise estates | Platform, Word collaboration | No |
| 12 | Docusign Iris | Agreement platform AI | Existing Docusign customers | Docusign CLM / IAM | Plans listed; review is entitlement-based |
| 13 | Leah | Agentic enterprise CLM | Enterprise legal + procurement | Leah platform | No |
Detailed price notes are on our AI contract review pricing page.
How to choose AI contract review software
- Decide which job you are hiring the software for. Redlining inbound third-party paper calls for a Word-native tool (Spellbook, LegalOn, Gavel Exec, LegalSifter). Running contracts end to end calls for a CLM (Ironclad, Juro, LinkSquares, Sirion). Reviewing hundreds of documents in a data room calls for a diligence engine (Kira, Luminance, Harvey Vault).
- Test it on your own contracts. Run a pilot on 20–50 real agreements you have already negotiated, and compare the AI's flags with what your lawyers actually changed. Vendor accuracy and time-saving figures are self-reported.
- Check the playbooks. Prebuilt playbooks (LegalOn's 135+, LegalSifter's standard sets) get you started fast. Custom playbooks built from your precedents matter more over time. Find out which pricing tier unlocks them.
- Ask about data handling. Get in writing whether your data is retained by or used to train third-party models. Ask for SOC 2 Type II or ISO 27001 reports, SSO, and audit logs.
- Count the real cost. Per-seat Word add-ins are quick to deploy. CLMs add implementation, integrations and change management. Ask about usage caps (Gavel's 1,000 completions per month, for example) and view-only seats.
- Check vendor stability. The market is consolidating: Robin AI was broken up, Gavel was acquired by Relativity, Evisort became part of Workday, and Lexion became part of Docusign. Ask what happens to your data and contract if the vendor changes hands.
- Keep a lawyer in the loop. Treat every product here as a first-pass reviewer, not a replacement for legal judgment.
Frequently asked questions
What is AI contract review software?
It is software that reads a contract and compares its terms against your standards (a playbook) or market norms. It flags risky, missing or non-standard clauses, explains the issues, and usually suggests redlines. Many products also extract key data such as renewal dates and liability caps.
What is the best AI contract review software?
For Word-based review by law firms and in-house lawyers, Spellbook. For in-house teams that want prebuilt attorney playbooks, LegalOn. For enterprises that want review inside a full CLM, Ironclad or Luminance. For large-firm and due-diligence work, Harvey or Kira. For a solo practitioner on a budget, Gavel Exec, which has a published per-user price.
Can AI review contracts as well as a lawyer?
No. These tools speed up the first pass on repeatable agreements such as NDAs, DPAs, MSAs and vendor terms, but they lack your deal's commercial context and they make mistakes. Vendors including LegalSifter say plainly that AI does not replace lawyers. A qualified person should approve every redline.
How much does AI contract review software cost?
Most vendors only quote prices. Gavel Exec publishes its price: $160 per user per month, or $1,740 per user per year. Spellbook prices per user by quote and offers a 7-day trial; LegalOn quotes three tiers. Full CLM platforms such as Ironclad, Sirion and LinkSquares are negotiated enterprise contracts. See our pricing page.
Is there free AI contract review software?
No product on this list is free for ongoing professional use. Free ways to start include Gavel Exec's 25 free queries per user, Spellbook's 7-day trial and LegalSifter ReviewPro's free trial. Spellbook also offers free academic access.
Which AI contract review tools work inside Microsoft Word?
Spellbook, LegalOn, Gavel Exec and LegalSifter ReviewPro are built around Word. Juro and LinkSquares also offer Word redlining, and Sirion supports Word collaboration.
Will my contracts be used to train AI models?
The policy differs by vendor, so confirm it in your contract. Spellbook states zero data retention with its LLM providers. Ironclad states zero data retention and that customer data is excluded from AI training. LegalOn says customer data is never used to train third-party foundation models. Juro advertises zero-retention APIs.
What is the difference between AI contract review and CLM software?
A review tool analyzes and redlines a contract in front of you. CLM (contract lifecycle management) software runs the whole process: intake, drafting, approvals, signature, storage, renewals and obligations. Most CLMs now include AI review; standalone review tools are lighter and faster to adopt.
What happened to Robin AI, Evisort, Lexion and Kira?
Robin AI failed to close a funding round in 2025. Scissero bought its managed-services arm in December 2025, but the technology platform was not part of that sale, and Microsoft hired several of its engineers in January 2026. We therefore do not list Robin AI. Evisort now continues as Workday Contract Intelligence, Lexion is part of Docusign, and Kira continues under Litera.
What is the best AI contract review software for small law firms?
Spellbook and Gavel Exec are the most natural fits: both work in Word, can be started without an enterprise implementation, and offer trials or free starts. Gavel Exec is the only one with a published price.
Also considered
Workday Contract Intelligence (powered by Evisort) is strong for analyzing a portfolio of signed contracts, but its published materials focus on extraction and search rather than pre-signature redlining. Robin AI is excluded for the reasons above.
Related guides: Best enterprise agent platforms