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AI Services for Legal / Attorney

AI Services for Legal / Attorney

Automate contract review and legal risk extraction to achieve both accuracy and speed.Browse 13 AI services to find the tool that best fits your work challenges.

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リーガルフォース

LegalForce

LegalOn Technologies’ AI contract-review platform. The AI detects risks and missing clauses in pre-signing contracts and presents revision examples, sample clauses, and templates. It is now evolving into the company's main product "LegalOn" (formerly LegalOn Cloud), and LegalOn added a matter API, automatic contract linking, and Agent Builder (beta) in October 2026, and in November a review feature in which AI flags contradictions between clauses within a contract and with related contracts.

# AI-OCR（文字認識）# 業務効率化# 自動化・省力化# 日本語対応

エーアイレックス

AILEX

AILEX is an AI legal OS from AILEX LLC for Japanese law firms with one to five lawyers. In a single screen per case, it offers a case chat that reads the case record and answers with citations, drafting from 57 templates with quality checks, preparation of filings for mints (Japan's electronic filing system for civil court documents) including exhibit-number stamps, splitting by file size, and file naming, deadline and hearing-date management, and fee, expense, and invoice tracking. Case records are stored in the AWS Tokyo Region and AI inference runs only on Amazon Bedrock's Japan-only inference profiles (Tokyo and Osaka); inputs are not used for training. Pricing is ¥13,200 per seat per month (tax included), with a one-month free trial from sign-up.

# 生成AI（LLM）# PDF・文書生成# AI-OCR（文字認識）# スケジューラー# 業務効率化# 日本語対応

オルガ

OLGA

A "legal OS" from GVA TECH that uses AI to automate everything from contract review to contract management and legal-matter management in one flow. Consolidated from the former "GVA" series and renamed OLGA in 2024. It comprises AI Contract Review, Contract Management, an AI Legal Assistant, and a legal Q&A data foundation, and also centrally manages inquiry intake from email, Slack and Teams, using generative AI (ChatGPT API).

# AI-OCR（文字認識）# 業務効率化# 自動化・省力化# 日本語対応

リチェック

LeCHECK

An AI contract-review support cloud from lawyer-founded Lisse Co., Ltd. Rather than general-purpose generative AI, it is a "legal-specialized AI" based on lawyer-supervised fixed check rules; it detects contract risks with a priority (A/B/C) and presents revision suggestions and clause explanations. Japanese & English, 100+ contract types and 1,300+ templates, plus own-standard review and contract management. Deployed at 5,000+ companies.

# AI-OCR（文字認識）# 業務効率化# 自動化・省力化# 日本語対応

リーガルスケープ

Legalscape

A legal research service that searches across 4,500+ legal books, court precedents, statutes, and guidelines, with AI summarizing key points while stating the underlying sources. Supports link navigation to originals and reverse lookup of works citing them. Adopted by all five of Japan’s largest law firms. Free trial available; pricing on request. In October 2026 it announced a partnership to offer its AI within the US legal AI Harvey (planned for early 2027 or later).

# 業務効率化# 自動化・省力化# 日本語対応

リーガルブレイン

Legal Brain

A legal-specialized AI agent from Bengo4.com for attorneys and corporate legal departments. Ask in natural language and it searches across statutes, court precedents, specialist books, and guidelines via its proprietary LegalGraph database, returning organized legal issues with links to the underlying sources.

# 業務効率化# 自動化・省力化# 日本語対応

ローグ

LAWGUE

A cloud service from FRAIM Inc. (Shibuya-ku, Tokyo) for drafting, reviewing, and managing contracts and internal regulations. "LAWGUE" for contracts offers case management, AI-assisted review, similar contract search, and diff comparison, while "LAWGUE規程管理" automatically builds the cross-references between imported regulations and shows the impact of revisions. By registering its MCP server, you can search and review your own contracts and regulations from Copilot, Claude, ChatGPT, and Gemini. Used by TS TECH, Toyota Finance, Kajima, and others. Pricing by custom quote (short-term trial available).

# PDF・文書生成# 検索エンジン・RAG# データ連携（API連携）# 業務効率化# 日本語対応

モンテスキュー

MNTSQ

"MNTSQ CLM," a contract lifecycle management (CLM) platform for large enterprises from MNTSQ, Ltd. (Chuo-ku, Tokyo). It brings legal request intake and review, post-signing contract management, and knowledge building together in one place: AI automatically fills in contract management fields and assesses risk to decide whether a legal consultation is needed. It also includes an AI agent equipped with a playbook co-developed with the law firm Nagashima Ohno & Tsunematsu. Used by Kuraray, Tokyo Electron, Sumitomo Corporation, and others. Pricing by custom quote.

# AIエージェント# AI-OCR（文字認識）# 業務効率化# 自動化・省力化# 日本語対応

チャットジーピーティー

ChatGPT

ChatGPT is an AI assistant provided by OpenAI, the conversational service at the center of the generative AI boom. The desktop app has moved to a new app that combines Chat, Work, and Codex, and the previous version, "ChatGPT Classic," will be discontinued on January 30, 2027 (chat history carries over). Since October 2026, Chat runs on GPT-6 (GPT-6 Sol on paid plans, GPT-6 Luna on Free and Go), and the new Intelligent UI builds charts, buttons, forms, and small tools into answers. With the Chrome extension, Chat can read your open tabs and Work can operate them to fill out forms, send messages, and download files (all plans). In ChatGPT Work and Codex, you can also choose GPT-6.1 Sol (September 2026) and GPT-6.1 Terra (October 26), which excels at reading images and computer use and costs half as much as Sol on the API (input $1 / output $5 per 1M tokens) (Plus and above). ChatGPT Slides lets you create and co-edit decks in real time (Pro, Business, Enterprise). On November 10, 2026, Business Hub launched in beta, letting companies manage their information and check metrics such as mentions. It also offers Deep Research, image generation, data analysis, voice conversation, and a coding agent (Codex), plus projects, scheduled tasks, custom GPTs, and workspace agents. Pricing is free / Go ¥1,400 / Plus ¥3,000 / Pro ¥16,800– (individual, monthly), with Business and Enterprise for organizations.

# 生成AI（LLM）# AIチャットボット# 要約・翻訳# テキスト生成# AIエージェント# 日本語対応

ディープシーク

DeepSeek

DeepSeek is an open large language model (LLM) family, together with the AI chat and API services built on it, developed by DeepSeek (Hangzhou, China). Since October 17, 2026, the current model is DeepSeek-V4.1-Flash-1017, with weights released under the MIT License. Chat is available on the web and in the app, while the API supports a 1M-token context, image input, Thinking mode, and OpenAI / Anthropic compatibility, with pay-as-you-go rates halved outside peak hours. DeepSeek also offers the larger V4-Pro and the Search / Fetch APIs for web search.

# 検索エンジン・RAG# 生成AI（LLM）

ハツヒョウジセンコウセイスクリーニング

「初」表示先行性スクリーニング

"初" Display Prior-Art Screening is a free web tool from Teikoku Number One Research that uses AI to pre-screen advertising claims such as "world's first," "Japan's first," and "industry first." Enter the full claim and what is actually new, and it rates in four levels whether the wording can stand as is, then suggests how far to narrow the scope, which qualifiers to add, more defensible wording, the evidence you will need, and cautions for each ad platform, while also searching public information for possible prior examples. It is free to use (company name and email required). Results are a preliminary screening and cannot be used as substantiation for an advertising claim.

# 生成AI（LLM）# マーケティング# コピーライティング# 検索・レコメンド# 日本語対応

ソブリンガイザー

Sovereign GaiXer

An on-premises generative AI from FIXER Inc. (Minato-ku, Tokyo). Connect the palm-sized unit (based on Lenovo ThinkStation PGX, NVIDIA Blackwell) to your internal LAN and AI processing is completed inside the unit, letting you use generative AI for summarizing documents, drafting materials, reviewing contracts and answering with reference to internal documents (RAG) without sending company data to the internet. Business apps can be added from the GaiXer App Store, and a "redaction app" co-developed with Iga City comes as standard. The price is a one-time purchase of ¥3,806,400 (excl. tax; includes hardware, software license and 3-year warranty), with no extra charges for generations or users. Lease/installments and a 2-week free trial are available.

# 生成AI（LLM）# テキスト生成# 検索エンジン・RAG# 要約・翻訳# 業務効率化# 日本語対応

アリエルエルエムアップマーケット

Alli LLM App Market

An all-in-one generative AI and AI agent platform for enterprises from Allganize Japan Inc. (Shibuya, Tokyo). It bundles more than 100 ready-made business apps and AI agents (meeting minutes, contract review, internal FAQ and more), a proprietary RAG engine that answers from internal documents—including tables and charts—with cited sources, no-code app building, and admin features such as SSO, IP restrictions, guardrails and audit logs. You can choose models such as GPT, Claude and Gemini, and deploy on-premises or in a private cloud. Pricing is a flat fee with unlimited users: the cloud edition starts at a JPY 300,000 setup fee plus JPY 300,000 per month (excluding tax). Customers include NTT DOCOMO, Persol Communication Service and Meiji Seika Pharma.

# 生成AI（LLM）# AIエージェント# 検索エンジン・RAG# AIチャットボット# 業務効率化# 日本語対応

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