AI Services in Copywriting

AI tools that automatically generate and suggest copy for ads, articles, and websitesFeaturing 12 AI services in total.

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

グランタブル

Grantable

An AI-powered platform for nonprofits and grant professionals that acts as an "AI grants department," handling everything from funder discovery to proposal writing and deadline management. Upload past applications and materials, and its AI learns your organization's information and voice to draft proposals. Beyond writing, it covers funder prospecting/scoring and pipeline management.

# テキスト生成# PDF・文書生成# コピーライティング

スードウライト

Sudowrite

An AI writing tool built specifically for fiction and creative storytelling. Features include Story Bible for developing ideas into chapter outlines, Write for suggesting continuations, Describe for vivid scene-setting, Brainstorm for idea expansion, and Expand for fleshing out prose. Designed as a creative co-author for writers. Interface and optimization are primarily English-focused; Japanese creative writing is not practically supported.

# テキスト生成# コピーライティング# アイデア支援／創造ツール# 品質向上・クリエイティブ支援

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

グラマリー

Grammarly

An AI writing assistant that detects and fixes grammar, spelling, and punctuation errors in English in real time. It also handles tone adjustment, rewriting, generative AI writing, and plagiarism/AI-text detection, usable broadly via browser extensions, desktop/mobile apps, and Microsoft Office and Google Docs. It is English-centric and effectively does not support Japanese proofreading.

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

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

キャッチー

Catchy

Catchy is one of Japan's largest AI writing assistant tools, provided by DigitalRecipe Inc. Powered by ChatGPT, it lets you quickly generate writing that fits your purpose simply by choosing from 100+ purpose-specific tools for ad copy, articles, documents, emails, brainstorming, and more. It has surpassed 90,000 members and has been featured on NHK, Nippon TV, TBS, and other outlets. Pricing runs from Free ¥0 / Starter from ¥3,000/mo / Pro ¥9,800/mo (unlimited use) / Enterprise, and you can start free with no credit card registration required.

# コピーライティング# テキスト生成# マーケティング# 日本語対応

インク

INK

[Discontinued] INK (INK for All) was a marketing/SEO AI writing platform, but it has been shut down; its site and app now redirect to the operator's other service, SmythOS. Alternatives include Surfer, Frase, and Transcope.

# テキスト生成# SEO# コピーライティング

サーファー

Surfer

A content-optimization platform (Positive Surfer) that optimizes content to search intent to be chosen in both Google and AI search. It offers a Content Editor with Content Score, SERP analysis, and the Surfer AI writer, plus an AI Tracker for mentions in ChatGPT, Perplexity, and more. From $49/mo (annual).

# SEO# マーケティング# 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

ライター

Rytr

Rytr is an affordable AI writing assistant starting from $7.50 a month. Pick from more than 40 use cases such as emails, articles, ads, and social media posts, then generate writing that "doesn't sound robotic and sounds like you" using 40+ languages, 20+ tones, and My Voice, which reproduces your writing style from samples of your own text. It also includes a plagiarism checker, a Chrome extension, and an API, and is used by more than 8 million copywriters and marketers worldwide. The free plan requires no credit card, Unlimited is $7.50/mo, and Premium is $24.16/mo.

# テキスト生成# コピーライティング

マジック エルピーオー

MagicLPO

[Availability to be confirmed] MagicLPO, provided by free web Inc. (formerly free web hope), was an AI-powered LPO (landing-page optimization) tool supporting AI improvement proposals, no-code editing, and A/B testing. However, as of August 2026 its official site is unreachable and it is no longer listed among the provider's products (no formal end-of-service notice). Please confirm the latest availability before considering it.

# デザイン生成# コピーライティング# コード生成# 品質向上・クリエイティブ支援# マーケティング# 日本語対応

Recommended Articles on Copywriting

[2026 Edition] 13 AI Tools to Solve Marketers' Challenges | Organized by Use Case and Workflow

A curated, category-by-category selection of the latest AI tools that tackle marketers' everyday challenges — content creation, social media management, report generation, and more. [Latest 2026]

[2026 Edition] 7 Essential AI Tools for Writers | Full Coverage from Auto-Writing and Image Generation to Reference Management

A guide to 7 cutting-edge AI tools that streamline the full writing pipeline — auto-drafting articles, generating images, and organizing reference lists. The 2026 edition for writers who want both speed and quality, featuring tools like Writesonic and Canva.

LLMO/GEO Tools Compared: 12 Best Picks for 2026 (Domestic & Overseas) — by Supported AI, Features, and Pricing

A thorough comparison of LLMO/GEO optimization tools that help your brand get cited and recommended in AI search (ChatGPT, Gemini, and more), split into 8 Japanese tools (Genview, DolphinX AIO, AKARUMI, Mieruca GEO, SUPER ACT, User Insight, BringRitera, LLMOinsight) and 4 overseas tools (Profound, Peec AI, OtterlyAI, AthenaHQ), by supported AI, feature type, pricing (monthly / annual), and free tiers. Includes a 14-tool comparison table (adding the GEO-ready production tools Writesonic and Readdy), a three-line verdict, picks by goal, six axes for choosing, price ranges, free options, and an FAQ on LLMO vs. GEO and the metrics for measuring results — based on official listings as of August 2026.

[2026 Edition] 14 AI Tools to Supercharge Social Media Management | Post Creation, Short Videos, Avatars, and Voice Conversion All in One

A detailed guide to 14 AI tools that tackle social media challenges: bulk post creation, automated short-form video generation, virtual human appearances, and voice conversion. Learn how to integrate them into your workflow to boost engagement and operational efficiency at the same time.

[2026 Edition] Must-Have AI Tools for Web Designers: 12 Picks | From No-Code Site Building and Asset Creation to Banner Generation and Copywriting

A curated guide to AI tools that boost web designer productivity. Covers no-code site building, icon and asset creation, automated banner generation, A/B test copy creation, and more — all directly applicable to real-world work.