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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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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

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

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

ディープエル

DeepL

An AI translation service known for natural, context-aware output, built by Germany's DeepL SE. Beyond text and document translation it now spans DeepL Write for proofreading, DeepL Voice for speech, and the DeepL API. Prices show in your region's currency — 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). The free tier caps text at 50,000 characters a month.

# 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 the latest Gemini models (the 3.x family), 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 is free, plus Google AI Plus ¥725 / Pro ¥2,900 / 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. Built on the latest GPT-6 Astra and GPT-5.6 family, it runs question answering and writing plus Deep Research, image generation, data analysis, voice conversation, and a coding agent (Codex) in a single app. It is expanding into features that hand off tasks, such as 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 (5x) and $200 (20x), with Team and Enterprise also offered.

# 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

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. From a rich library of templates and assets, you can create more than 1,000 kinds of designs such as presentations, social media posts, videos, and flyers, and with generation and editing by Canva AI plus the integration of Affinity and Leonardo.Ai, 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. Used by more than 6 million teams worldwide.

# 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

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

ノーション

Notion

An all-in-one AI workspace that combines docs, wikis, projects, and databases with deeply integrated AI — including Q&A across your workspace and connected apps, AI meeting notes, autonomous agents, and autofill. Its AI uses models from Anthropic, OpenAI, and others.

# 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

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

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

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

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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