おすすめの法律AIツール

おすすめの法律AIツール の比較

価格は各社が公開している開始価格です。無料プランや試用は、価格ページに書いてあるときだけ載せます。

ランキング

仕事への適合、自律性、制御、連携、始めやすさ、情報の公開度で並べています。

価格、機能、要約

1. 1

   Harvey

   Large law firms and corporate legal departments running high-stakes work on one platform.

   Harvey is an AI platform for law firms and in-house teams, with agents, shared Spaces, a document Vault, contract intelligence, and a command center for usage. The site says more than 3,000 legal organizations use it and that default controls include SAML SSO, audit logs, IP allow-listing, and data lifecycle management.

   料金

   Not published

   No price, plan, or free trial is listed on the homepage opened. Access is presented through the product site rather than a public rate card. Last checked 5 October 2026.

   主な機能

   SAML SSO. It can carry a stretch of the work, then wait. A person still approves anything that leaves the building.

   利用者の声

   r/biglawの訴訟担当は、事務所が公開チャットボットを許さないとき、Harveyは顧客仕事に足り、校正と矛盾の確認に触れる、と書いています。

   r/legaltechの試用者は、販売の押しが強く、製品はGPTの薄い画面に感じた、と書いています。不満は価格であり、足りない機能の一覧ではありません。

   • “I find Harvey invaluable in my work (I’m a litigator). I think that ChatGPT performs better, but Harvey is more than good enough, and we’re not authorized to use public models with client materials.”

     Reddit

   • “For the price, complete bullshit. the sales team oversells like crazy, but under the hood it’s just a thin UI on top of GPT with a prompt sheet and some document storage.”

     Reddit · u/tulumtimes2425

   Harveyの料金と機能/Harveyの代替

2. 2

   Legora

   Law firms and in-house teams that want agentic workflows across research, review, and delivery.

   Legora describes itself as collaborative AI for lawyers, with the Legora aOS connecting information, communication, and execution of legal work. Its Agent plans, executes, reviews, and delivers work, and the product list includes a Word add-in, Outlook add-in, tabular review, legal research, and a portal.

   料金

   Not published

   The homepage offers a demo and does not list a price, plan, free tier, or trial. The site cites SOC 2 Type II, ISO 27001, ISO 42001, GDPR, and HIPAA, and says customer data is not used for AI training. Last checked 5 October 2026.

   主な機能

   Microsoft Word, Microsoft Outlook. It can carry a stretch of the work, then wait. A person still approves anything that leaves the building.

   利用者の声

   r/legaltechのある比較は、小さい事務所にはLegoraのほうがHarveyより易しく見えた、と書いています。

   同じコメントはより限られていると言い、別のコメントは大きい事務所が買うものではない、と書いています。

   • “Legora looked a bit easier to use but also more limited.”

     Reddit

   • “Harvey is a waste, too high of a price. Legora apparently isn't Enterprise ready if you're at a large law firm.”

     Reddit

   Legoraの料金と機能/Legoraの代替

3. 3

   Spellbook

   Law firms and in-house teams that negotiate contracts in Microsoft Word.

   Spellbook reviews and drafts contracts and applies playbooks, with intake from email and Slack and a Word add-in plus an Associate multi-document agent. The company says it is trusted by 5,000+ legal teams and lists SOC 2 Type II, HIPAA, GDPR, and zero data retention with LLM providers.

   料金

   Not published

   Pricing is custom and based on the number of team members on the license. No dollar amount is published. A 7-day free trial is offered, with extended trials possible for larger organizations. Academic institutions can inquire about free access. Dedicated support is listed for teams over 10. Last checked 5 October 2026.

   主な機能

   Microsoft Word, Email, Slack. It can carry a stretch of the work, then wait. A person still approves anything that leaves the building.

   利用者の声

   Harveyを離れて小さめの道具に移ったr/biglawのコメントは、着地先の一つにSpellbookを挙げています。

   そのコメントはSpellbookの失敗を書いていません。出力は自分でまだ確認する、とあります。

   • “So I moved to smaller tools like Spellbook, AI Lawyer, and CoCounsel and it honestly felt like the same practical benefit with less fuss.”

     Reddit

   Spellbookの料金と機能/Spellbookの代替

4. 4

   Paxton

   Litigation attorneys and small firms that want research and drafts tied to the case file.

   Paxton is AI for litigation teams that keeps the matter record, legal research, and drafting in one workspace, with citations to case files and authority. The site says it connects to a DMS, Claude, Microsoft Word, and Outlook, and that it is SOC 2, ISO, and HIPAA compliant.

   料金

   $499 per user/month

   Individual is $499 per user/month, or $2,999 per user/year, which the page says saves 50% compared with monthly. Enterprise is custom volume-based pricing with firm-wide access, onboarding, and an account manager. The Individual plan includes US federal regulations, state laws, and case law across all 50 states. Last checked 5 October 2026.

   主な機能

   DMS, Claude, Microsoft Word, Microsoft Outlook. A person drives. The product drafts, searches, or suggests inside a workflow you already run.

   Paxtonの料金と機能/Paxtonの代替

5. 5

   Clio

   Law firms that want practice management, billing, and matter-aware AI in one system.

   Clio Manage is practice-management software for matters, documents, time, billing, trust accounting, and client payments. The pricing page says AI is included on Core and above, grounded in the firm's matters, and that firm data is not used to train AI.

   料金

   From $49/user/mo

   Clio's plans start at $49 USD per user per month. The four plans are Starter, Core, Signature, and Elite. Dollar prices above the $49 starting point were not listed on the page opened. AI features such as drafted bills, client updates, and scheduling are on Core and above. Accounting, including trust reconciliation, is included on every plan. Card payments are listed at 2.95% (3.75% American Express) and eCheck and ACH at 1%. The page title offers a free trial. Clio states SOC 2 Type II, GDPR, and 99.9% uptime. Last checked 5 October 2026.

   主な機能

   Gmail, Microsoft Outlook, QuickBooks, Xero, TrustBooks. A person drives. The product drafts, searches, or suggests inside a workflow you already run.

   Clioの料金と機能/Clioの代替

6. 6

   CoCounsel

   Firms and professional teams that want AI tied to Westlaw, Practical Law, or Checkpoint.

   CoCounsel is Thomson Reuters' AI for legal, tax, audit, compliance, and drafting work, grounded in its content and connected to Westlaw, Practical Law, Checkpoint, Microsoft 365, and document-management partners. The company says customer content and prompts are not used to train CoCounsel or the underlying models, and that OpenAI and Google calls use zero-retention APIs.

   料金

   Not published

   The CoCounsel product page opened does not list a dollar price or a free trial. A separate Thomson Reuters sales page, seen in search but not opened, says online pricing is available only for new law-firm customers with up to 10 attorneys. Last checked 5 October 2026.

   主な機能

   Westlaw, Practical Law, Checkpoint, Microsoft 365. A person drives. The product drafts, searches, or suggests inside a workflow you already run.

   利用者の声

   r/biglawの同じコメントは、日常の起草でHarveyの席を置き換えた小さめの道具の一つとしてCoCounselを挙げています。

   そのスレッドにCoCounselだけの失敗は読んでいません。共通点は、人が草稿をまだ確認する、ということです。

   • “Still have to review everything yourself either way.”

     Reddit

   CoCounselの料金と機能/CoCounselの代替

7. 7

   Lexis+ AI

   Attorneys who want drafting and research grounded in LexisNexis authority and Shepard's.

   The Lexis+ with Protégé free-trial page, which describes the product formerly presented as Lexis+ AI, says it accelerates research, drafting, and analysis grounded in LexisNexis content and Shepard's citations. It also says general AI and legal AI can be used together in one secure workspace.

   料金

   Not published

   The original product URL returned HTTP 403. The free-trial page that did open invites a Lexis+ with Protégé trial and does not list a price or trial length. A subscription dollar amount was not verified. Last checked 5 October 2026.

   主な機能

   Shepard's. A person drives. The product drafts, searches, or suggests inside a workflow you already run.

   Lexis+ AIの料金と機能/Lexis+ AIの代替

8. 8

   Eve

   Personal injury and other plaintiff firms that want intake, medical review, and drafting in one system.

   EveOS is an AI operating system for plaintiff law firms, covering intake, medical chronologies, demand letters, discovery, research, and a nightly auditor that reviews active matters. Eve says it is trusted by 1,200+ firms, is SOC 2 Type II and HIPAA compliant, and does not use case data to train shared models.

   料金

   Not published

   The homepage offers a demo and a call. No dollar price, free tier, or trial length is listed. Last checked 5 October 2026.

   主な機能

   CMS. It can carry a stretch of the work, then wait. A person still approves anything that leaves the building.

   Eveの料金と機能/Eveの代替

9. 9

   EvenUp

   Personal injury firms that want demands, medical review, and negotiation support from case files.

   EvenUp is AI for personal injury firms covering intake, treatment tracking, demands, negotiation, discovery, and trial prep. The site says demands can be instant AI drafts or legal-reviewed drafts, cites a 250K+ verdict and settlement dataset, and says the company is SOC 2-audited and HIPAA-attested.

   料金

   Not published

   No price, free tier, or trial is listed on the homepage opened. Last checked 5 October 2026.

   主な機能

   CMS. It can carry a stretch of the work, then wait. A person still approves anything that leaves the building.

   EvenUpの料金と機能/EvenUpの代替

10. 10

    Luminance

    Enterprises that want contract review and portfolio insight beyond the legal department.

    Luminance is a contract-intelligence platform for negotiating with playbooks, discovering risk and obligations across a portfolio, and automating workflows from intake to signature. It says it is used by 1,000+ enterprises and lists ISO 27001 and SOC 2 Type II.

    料金

    Not published

    The homepage offers a demo and does not list a price, free tier, or trial. Last checked 5 October 2026.

    主な機能

    None named on the pages we opened. It can carry a stretch of the work, then wait. A person still approves anything that leaves the building.

    Luminanceの料金と機能/Luminanceの代替

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よくある質問

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