One of Japan's largest directories x find the right AI in as little as a minute

AI Services for Marketer that Solve "Lead and Closing Paragraph Creation"

An article's opening (the lead) and closing (the summary) shape both completion rate and whether readers take the next action, but they're often written last and rushed once the body copy is done. Here you can compare AI tools that support lead and summary writing.

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ジャスパー

Jasper

Jasper is an execution platform built for marketing teams (from Jasper AI, Inc.). It has grown from an AI writing tool into a marketing execution platform equipped with over 100 specialized AI agents, content pipelines, and Jasper IQ, which retains brand context. From GEO/SEO to personalization and multilingual content, it lets you produce content quickly and at scale while keeping the brand consistent. Pricing is Pro at $59/month (annual) or a custom Business plan, with a free trial available.

# コピーライティング# SEO# テキスト生成# AIエージェント

ライトソニック

Writesonic

Writesonic is an "AI Search Growth Engine" (GEO/SEO platform) that measures your visibility across AI search surfaces such as ChatGPT, Gemini, and Google AI Overviews and improves it through content and technical work so your brand gets recommended and cited. Reinvented from its earlier AI writing tool (Chatsonic), it pinpoints which prompts get competitors recommended, fixes the gaps with AI articles and AI agents (Action Center), and demonstrates the impact all the way through to traffic, pipeline, and revenue. It is used by more than 10,000 marketing teams worldwide. Pricing starts at Starter $79, Basic $199, and Growth $399 (per month, billed annually) and more, with a free trial that requires no credit card.

# LLMO・GEO（生成AI検索最適化）# SEO# マーケティング# AIエージェント# コピーライティング

コピードットエーアイ

Copy.ai

Copy.ai is an "AI-native GTM platform" that embeds AI across the entire sales and marketing (GTM) workflow. It has evolved from a former AI copywriting tool into a platform that runs everything from prospecting to content creation and deal support on a single foundation. With Workflows, Actions, Agents, Tables, Chat, and more it standardizes and automates processes, supporting 2,000+ integrations and being LLM-agnostic. Pricing includes the self-serve Chat plan at $29/mo and Enterprise (credit-based, demo required). Used by more than 17 million people worldwide.

# コピーライティング# SEO# テキスト生成# AIエージェント

コメット

Comet

An AI browser from Perplexity. The Comet Assistant in the sidebar summarizes and explains the pages and tabs you have open, while the Comet Agent takes over browser actions such as filling in forms, making bookings, and drafting emails. Perplexity is the default search engine. Available on Mac, Windows, iOS, and Android, and the browser itself is free (Comet Plus, which unlocks articles from partner publishers, is $5/month and included at no extra cost with Perplexity Pro and Max).

# AIエージェント# 検索・レコメンド# 要約・翻訳# 業務効率化# 生成AI（LLM）# 日本語対応

ディープエル

DeepL

DeepL (pronounced "deep-L", often typed "deep l") is an AI translation service from Germany's DeepL SE. The free tier covers 50,000 characters a month; paid DeepL Pro starts at ¥1,380/month in Japan (tax incl.). Beyond text and document translation it spans DeepL Write for proofreading, DeepL Voice for speech, and the DeepL API. In Japan, monthly billing is ¥1,380 Individual / ¥4,500 Team / ¥9,000 Business per user (¥1,150 / ¥3,750 / ¥7,500 as the annual monthly equivalent). Paid plans include 30 minutes of DeepL Voice per user per month, and since September 2026 DeepL also works inside Copilot, ChatGPT and Claude via MCP.

# 要約・翻訳# テキスト生成# 業務効率化# 生産性向上# 日本語対応

ジェミニ

Gemini

Gemini is an AI assistant provided by Google. Built on Gemini models (Flash-Lite, Flash, and Pro, plus Gemini 4 Argon—the latest model, launched October 13, 2026—on AI Pro and Ultra), it runs question answering and writing plus Deep Research, Gemini Live (voice), Canvas, and image/video generation in a single app. It integrates deeply with Google services such as Gmail, Google Docs, Search, Google Flow for video generation, and Gemini Notebook for research support. Pricing: free (Flash-Lite only from October 9, 2026), Google AI Plus ¥725 (up to Flash) / Pro ¥2,900 (up to Pro) / Ultra ¥14,500– (monthly).

# 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

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. 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). ChatGPT Slides lets you create and co-edit decks in real time (Pro, Business, Enterprise). 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

クロード

Claude

Claude is an AI assistant provided by Anthropic. It emphasizes long-context understanding and safety and reliability, with strengths in writing, summarizing, analysis, and coding. You can use the latest Claude models (Opus/Sonnet/Haiku) as suited to the task, and it includes Artifacts for generating and editing on the spot, Projects for gathering documents, Claude Code for developers, and MCP for connecting to external tools. Pricing is Free $0 / Pro $20 (annual $200) / Max $100 (formerly Max 5x) / Ultra $200 (formerly Max 20x; no 5-hour limit for verified accounts), with Team and Enterprise also offered. Since October 2026, Max, Ultra, and Team include monthly API credits (Max $100 / Ultra $200; Team up to $500).

# 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

キャンバ

Canva

Canva is an all-in-one online design platform that lets you create any kind of design by drag and drop, even with no design knowledge. You can create more than 1,000 kinds of designs such as presentations, social media posts, videos, and flyers from a rich library of templates and assets. Canva AI handles generation and editing, and since October 2026 all users can generate images with Canva Craft, Canva's first in-house image generation model (also available via API). With Affinity integrated, you can handle everything from creation to collaborative editing, printing, and brand management in one place. Pricing includes a free plan as well as Canva Pro at ¥11,800/year and Business at ¥18,800/year (per person, billed annually), among others.

# デザイン生成# 画像生成# プレゼン・スライド生成# テキスト生成# 日本語対応

ノーション

Notion

An all-in-one AI workspace that combines docs, wikis, projects, and databases with deeply integrated AI — including cross-app Q&A, AI meeting notes, and autonomous agents. On Business and up, you can connect a ChatGPT subscription (Plus, Pro, or Go) and use it for AI at no extra charge.

# テキスト生成# 要約・翻訳# ノーコード自動化# 通知・タスク連携# 業務効率化# 日本語対応

ディファイ

Dify

Dify is an open-source LLM app development platform for building, deploying, and operating AI apps, agents, and workflows with no-code/low-code. You can assemble chatbots, RAG, and multi-step workflows visually, and switch between the major providers' models. It supports both a cloud edition and self-hosting (OSS). Cloud pricing is Sandbox free / Professional $590 per year / Team $1,590 per year / Enterprise custom (17% off with annual billing), and the self-hosted Community edition is free.

# AIチャットボット# AIエージェント# ノーコード自動化# API・SDK# 業務効率化# 日本語対応

グーグルエーアイスタジオ

Google AI Studio

Google AI Studio is Google's developer platform to try the Gemini models in the browser, build and deploy AI apps, and get a Gemini API key. It's organized around Build (app generation), Chat, Stream, and Generate Media (image/video/audio), and offers the Gemini 3 family, Nano Banana image, Veo video, and more. AI Studio itself is free; the API is usage-based with a free tier. Note: on the free tier input is used to improve products; on the paid tier it is not.

# 生成AI（LLM）# AIモデル構築・管理# API・SDK# AIエージェント

ミライホンヤク

みらい翻訳

High-security AI machine translation from Mirai Translate, Inc., an NTT DOCOMO Group company. The enterprise "Mirai Translate FLaT" offers unlimited-volume, unlimited-seat plans (from 250,000 yen/month, tax excl.) across 20 languages, while "Mirai Translate Plus" for individuals has a free plan and paid plans from 550 yen/month (tax incl.). Translation data is never reused, with ISO27017 certification and a SOC 2 report.

# 要約・翻訳# 業務効率化# 生産性向上# 日本語対応

ワードチューン

Wordtune

An AI writing assistant strong at rephrasing (paraphrasing) English text. It offers tone-adjusted rewrites, summarization, AI text generation, grammar checking, and 'Humanize' to make AI text sound natural, usable via a browser extension or editor. By AI21 Labs. It is English-centric and effectively does not support Japanese proofreading/rewriting.

# コピーライティング# テキスト生成# 要約・翻訳# 品質向上・クリエイティブ支援

ムーンビーム

Moonbeam

An AI writing assistant built for long-form content — essays, articles, blogs, and stories. It offers drafts by its AI 'Luna', a Wizard that turns notes into outlines and paragraphs, a Custom Style Generator, and GPT-4 Smart Chat. Pro is $49/mo (billed yearly).

# テキスト生成

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No More Rushing to Write the Ending

Give AI the key points of your body copy, and it can quickly draft an engaging lead paragraph or a well-organized summary. The closing CTA in particular—directing readers to the next article or resource—tends to follow a predictable pattern, making it a good fit for AI-generated drafts.

Points Worth Comparing

How accurately it extracts key points after reading the full body copy
Whether it can use an appropriately different tone for the lead versus the summary
Whether it supports purpose-specific templates, such as CTA copy
How flexibly you can adjust the length of the generated output