AI Services in Copywriting

AI tools that automatically generate and suggest copy for ads, articles, and websitesFeaturing 19 AI services in total.

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

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

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

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

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

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

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

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

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

エアパルス

AirPulse

AirPulse is an AI search (AEO/GEO) platform from the team behind the online events platform Airmeet (Airmeet Networks Private Limited, India, and Airmeet Inc., US). It asks buyers' questions on ChatGPT, Perplexity, Google AI and other engines every day and measures, against competitors, whether your brand is named and your pages are cited. Drafts for the questions you are missing, a 0–100 GEO audit with re-verified fixes, publishing through a WordPress plugin and re-runs after publishing all happen in one loop. It also offers an MCP server and a managed service. English only. Pricing: Starter $89, Growth $179 and Pro $399 a month, Enterprise custom, with a 14-day free trial (no 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

ゴートップエスイーオー

Go Top SEO

Go Top SEO is an SEO and AI-search (GEO) platform from GO TOP DIGITAL MARKETING AND ADVERTISING LTD in Israel. It writes articles that answer what customers search for and schedules them to WordPress, Shopify or Wix, audits the site and applies fixes you approve, tracks rankings in Google and Google Maps, checks citations across six AI engines including ChatGPT and Gemini, posts to Google Business Profile, and produces PDF and Excel reports, all in one place. It supports Japanese. Plans start at $79 per month (plus tax), with a 7-day free trial that needs no credit card.

# SEO# LLMO・GEO（生成AI検索最適化）# コピーライティング# マーケティング# 日本語対応

リフ

Riff

A free Chrome extension from Zima Media OÜ in Estonia that drafts social media replies, DMs and posts on X, LinkedIn, Facebook and Instagram. Because it runs Gemini Nano, the Google AI built into Chrome, on your own computer, posts and drafts are never sent to an outside server, and no account or API key is needed. Give it your point and it writes text fitted to the post or conversation and fills the input box (you press send). It can also write in Japanese. It requires desktop Chrome 138 or newer, 22 GB of free space and other hardware conditions.

# 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

クイルボット

Quillbot

An AI writing assistant from Learneo, Inc. (US) built around AI paraphrasing (formerly styled QuillBot). It combines nine paraphrasing modes plus Custom modes, grammar checking, AI content detection, a Humanizer, plagiarism checking, summarizing, translation and citation generation, and also works through browser extensions, a Word add-in and mobile apps. Paraphrasing and translation support Japanese (grammar checking does not, and the interface is in English). Free plan available; Premium is $19.95/month or $99.95/year.

# 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# 教育# 日本語対応

ディストリブ

Distribb

Distribb is an AI SEO platform from Mind Ahead LLC. It researches buyer-intent keywords, writes long-form SEO articles in your brand voice and publishes them automatically to WordPress, Shopify, Webflow and other CMSs, exchanges contextual backlinks between member sites in the same niche, and tracks whether ChatGPT, Gemini, Perplexity and other AI search engines cite you, all driven by a built-in AI agent you instruct in plain English. Pricing: Pro $97/month (30 articles/month) and Accelerator $495/month (90 articles/month plus done-for-you video and social distribution), with a 7-day free trial.

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

ヴェリタス

Veritas

Veritas is a marketing platform from Optivus Corporation Private Limited (New Delhi, India) that combines SEO and AI visibility (LLMO/GEO) in one workspace. It tracks, prompt by prompt, whether ChatGPT, Perplexity, Gemini and Google AI Overviews mention or cite your brand, and lets you draft the page that answers each missed question from your own documents, with a source on every claim. Keyword research, site audits and rank tracking are included in the same subscription; pricing starts at INR 1,500/month (excl. GST) for Starter, and every self-serve plan comes with a 7-day free trial.

# LLMO・GEO（生成AI検索最適化）# SEO# マーケティング# コピーライティング# 生成AI（LLM）# 業務効率化

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