AI Services in Text Generation

AI tools that automatically generate written text and documentsFeaturing 44 AI services in total.

リテラ

BringRitera

BringRitera (Ritera) is a Japanese "SEO/LLMO platform" from BringFlower Inc. Built around AI writing, it unifies generative-AI mention tracking (LLMO), search-rank tracking, and image generation in one place. Its core "LLMO Compass" measures daily whether and where your brand (and competitors) are mentioned across ChatGPT, Gemini, Claude, Perplexity, Google AI Overviews, and AI Mode, and visualizes which URLs the AIs cited, the search keywords used, and branded-search trends. It also tracks Google/Yahoo!/Bing rankings and AI Overviews presence/citation at an industry-low ¥0.38+ per keyword, plus high-quality AI writing (switchable ChatGPT/Gemini/Claude) and image generation with 168 templates (Nano Banana 2 and more). Pricing starts from a free plan, with paid plans from ¥2,970/mo (tax included, annual billing). No. 1 in ITreview satisfaction (4.9/5), and the only SEO pick in Nikkei's "55 AI startups to watch."

# LLMO・GEO（生成AI検索最適化）# マーケティング# テキスト生成# 生成AI（LLM）# 業務効率化

グロック

Grok

A conversational AI assistant from xAI (led by Elon Musk). Its hallmark is answering with real-time, up-to-the-minute information via its integration with X (formerly Twitter). Beyond writing and coding, it offers web search, image and video generation ('Grok Imagine'), a voice mode, vision, and autonomous agent features. Supports Japanese.

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

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

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

ツムギ

tsumugi

tsumugi Inc.'s Japanese-focused SEO/AIO article generation AI that automates research through article generation and CMS posting from just a theme. It researches across the web, YouTube and news, writes articles mindful of SEO and generative-AI search (AIO/LLMO), and auto-posts to note and WordPress (in under 10 minutes, per the company). It uses Claude Sonnet 4.5, with monthly credit-based pricing (Lite from ¥9,800).

# テキスト生成# SEO# 自動化・省力化# マーケティング# 日本語対応

スカイワーク

Skywork

Skywork is an all-in-one AI agent with built-in deep research. From a single instruction, it can generate multiple deliverables—websites, slides, documents, spreadsheets, posters, videos, podcasts, and more. The SkyClaw agent switches among models such as Claude, ChatGPT, and Gemini to research, reason, and edit, and it supports automated execution through scheduled tasks and IM integration. Credits are granted for free every day (800 per the official listing), and beyond that it runs on a credit-based model.

# AIエージェント# 動画生成# プレゼン・スライド生成# 音声生成# テキスト生成# コード生成

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

クウェン

Qwen

A family of large language models from China's Alibaba (Qwen / Tongyi Qianwen) and its conversational AI, Qwen Chat (Qwen Studio). The current flagship is Qwen3.8-Max. Multimodal across text, image, and video, it offers chat, image and video generation, web search, and code generation for free. Many models are open source; Japanese is supported.

# 生成AI（LLM）# AIチャットボット# テキスト生成# 画像生成# コード生成# 日本語対応

ミストラル

Mistral

The conversational AI assistant 'Vibe' (formerly Le Chat) from France's Mistral AI. Beyond writing, summarizing, translating, and coding, one environment offers web search, image generation, PDF/document analysis, Deep Research, voice input, memory, and a coding agent. Mistral AI develops open-weight and commercial LLMs. Supports Japanese input/output.

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

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

イージーピージーエーアイ

Easy-Peasy.AI

An all-in-one AI platform that lets you use 40+ AI models (Claude/GPT/Gemini, etc.) for text, images, video, audio, and AI agents under a single subscription. With 300+ templates and brand voice, it covers a wide range of content creation in one place.

# テキスト生成# 画像生成# 音声生成# 要約・翻訳# 日本語対応

エーアイブログクン

AIブログくん

A Japanese blog-automation service that, just by setting your target search keywords, fully automates everything from keyword analysis to generating SEO articles with images, auto-posting to WordPress, and submitting them to Google for indexing. It runs hands-off after setup, with a 3-article free trial.

# テキスト生成# SEO# 日本語対応

カリス

Xaris

Xaris is a pro-oriented AI writing assistant that builds an article outline just by "talking" via voice input (developed by Studio Yurigraph; distributed in Japan by GMO Internet). Answer the AI's questions by voice and a draft foundation forms, with specialized modes for SEO articles, LPs, and proposals, plus material search and table creation. Pricing starts at STARTER ¥1,980/mo (excl. tax), with a free trial (20 requests, no credit card).

# テキスト生成# 要約・翻訳# 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

トランスコープ

Transcope

A Japan-made, SEO-focused AI writing tool powered by OpenAI's GPT (by Sharemaru Inc.). Bundles competitor analysis, keyword suggestions, rank checks, and internal-link suggestions, and can learn your company's info via CSV for internal documents. 17,000+ companies to date.

# SEO# テキスト生成# 日本語対応

ラテエーアイ

Latte AI

[Discontinued] Latte was an AI video-repurposing tool that automatically clipped long videos and podcasts into vertical social shorts with animated subtitles (35 languages), but it was discontinued on November 30, 2025 (annual subscribers were fully refunded). The team officially recommends Opus Clip and Submagic as alternatives. Operated by Latte Social (London).

# テキスト生成# マーケティング

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

オートブログギングエーアイ

Autoblogging.ai

An AI content platform that generates, optimizes, and auto-publishes SEO articles at scale from a keyword or title with one click, and tracks your visibility in Google's AI Overviews. It offers multiple modes, bulk generation of up to 500 articles, and WordPress integration. 35+ languages, with free credits.

# テキスト生成# SEO# 自動化・省力化

クソドットエーアイ

quso.ai

An all-in-one AI social-media tool (formerly vidyo.ai) covering long-to-short clipping, video editing, captions, post scheduling, and analytics. It also does video generation, content repurposing, and pre-post engagement prediction (Virality Score). Free plan available.

# テキスト生成# マーケティング

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

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

ミリキャンバス

MiriCanvas

A browser-based graphic design tool from Korea's MIRIDIH (a "Korean Canva"). With 530,000+ templates and drag-and-drop, you can create presentations, social posts, video, posters, logos and print. Its AI features are branded "miricle" (AI presentation, AI image generation, background removal, etc.). Commercial use is allowed even on the free plan with no watermark; Japanese UI; 18M+ cumulative users.

# 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

ショドー

Shodo

Shodo, from ZenProducts Inc., is a cloud service that centers on Japanese-focused AI proofreading and brings writing, peer review, and task management together ("your AI editorial department"). It flags typos, mis-conversions, honorific errors, and inconsistent notation in real time, and offers Shodo Copilot sentence-ending completion, AI review, a browser extension, Docs/Word integration, and an API. Pricing: Basic free / Premium ¥1,000 / Max ¥5,000 / Business ¥2,000 per user (tax incl.).

# テキスト生成# 要約・翻訳# 日本語対応

プロンプトラボ

Prompt Lab

[Appears to be discontinued] A Japan-made platform for designing and sharing prompts for generative AI, provided by Walkers, Inc. Its official domain (prompt-laboratory.com) no longer resolves via DNS and cannot be reached. This page summarizes available alternatives.

# テキスト生成# コード生成# 日本語対応

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

フレイズ

Frase

A platform for researching, writing, and optimizing SEO content that targets both Google ranking and AI-search citation ('the content operating system for AI search'). Beyond top-article analysis, briefs, AI writing, and SEO/GEO scores, it tracks AI Visibility across ChatGPT, Perplexity, and more, plus Content Guard and its own CMS.

# テキスト生成# SEO

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

コミックコパイロット

Comic-Copilot

An AI assistant that acts as a "consultation partner" for manga creation. Developed by alu Inc. drawing on the expertise of Shueisha's "Shonen Jump+" editorial team, it helps with coming up with themes and plots, fleshing out characters, adjusting and rephrasing dialogue, impressions and feedback, and even encouragement—all as a sounding board. It doesn't draw for you and is free to use (login with a Jump Rookie! / Manga no account required).

# テキスト生成# 画像生成# 日本語対応

ビデオトゥーブログ

Video To Blog

An AI tool that turns YouTube videos or audio files into SEO/GEO-optimized blog posts with one click. Auto-inserts images, supports multiple languages, and publishes to WordPress and more in one click. Free plan available.

# テキスト生成# 要約・翻訳

プロンプティチュードドットアイオー

Promptitude.io

A prompt management platform to develop, test, and manage prompts across multiple AI providers (OpenAI, Anthropic, Google, Bedrock, etc.) in one place — share with a team and embed into your apps and workflows. Includes no-code Flows, RAG-style document grounding, and API. Free tier available.

# テキスト生成# コード生成# ノーコード自動化

クラウドワークスエーアイ

クラウドワークス AI

[Service discontinued on June 30, 2026] CrowdWorks AI (formerly OrderMaid AI), offered by CrowdWorks, Inc., was a subscription platform bundling AI tools for writing, image generation, and transcription. Aimed at freelancers and individuals, it offered 330+ text-generation tools and more, but ended all services on June 30, 2026. See the official notice for refund and data details.

# テキスト生成# 画像生成# 業務効率化# 自動化・省力化# 日本語対応

ノーラング

NoLang

Mavericks Inc.'s made-in-Japan AI video generator. Enter text, a URL, or a PDF, and the AI analyzes it and auto-generates a video with an avatar narrating the explanation in seconds. Strong for education, training, manuals, and inbound PR in addition to vertical shorts; supports 18 languages and a Chrome extension. Over 200,000 registered users.

# テキスト生成# 動画生成# 日本語対応

アナキンエーアイ

Anakin AI

An all-in-one AI platform that combines chat across many AI models, 1,000+ pre-built AI apps, and a no-code AI app/workflow builder. From text with GPT/Claude/Gemini to image, video, and voice generation, plus automation and agents, all at low cost.

# テキスト生成# 画像生成# 音声生成# 動画生成# AIエージェント# 日本語対応

ミクソ

Mixo

A no-code AI website builder that generates a customer-facing website in tens of seconds just from a description of your business. It bundles a custom domain, contact form, hosting and SEO/AI search optimization (GEO), and has shifted its focus to lead-generating sites for small businesses and sole proprietors. It supports 40+ languages, and over 3 million sites have been created.

# テキスト生成# デザイン生成# ノーコード自動化# 業務効率化

レディ

Readdy

Readdy is an AI website builder: describe the site you want and it generates the design and the code together. You can also start from a template, a screenshot, or a reference URL, then edit it in a no-code editor and publish on your own domain. The official site is available in Japanese. The free plan covers 250 credits a month and 2 projects; paid starts at $25/month for Starter ($15/month equivalent on an annual plan). It also includes GEO optimization to help you get cited in AI search, Credit Care that refunds spent credits when a generation misses, form-based lead capture, and an AI receptionist. More than 120,000 people use it worldwide (as of August 2026).

# LLMO・GEO（生成AI検索最適化）# デザイン生成# コード生成# テキスト生成# 業務効率化# 生産性向上# 日本語対応

ノベルシャフト

NovelShaft

NovelShaft is an AI-assisted novel-writing environment that keeps the manuscript, the manuscript outline, reference material such as characters and world-building, and conversations with AI together in one work. From shaping a fragment into an idea, through drafting and long-form revision, to export as Text, Markdown, DOCX, PDF, or EPUB 3 and publishing, everything happens on one screen, and the design puts the author in charge of what stays in the work: AI changes can be skipped before they are applied. It supports vertical writing, ruby, and read-aloud, handles Japanese and English works, and runs on the Web and iOS (iPhone and iPad). Pricing is a free Free plan (200 AI credits every 30 days) plus monthly Light $15, Standard $30, and Pro $90 plans.

# テキスト生成# アイデア支援／創造ツール# 品質向上・クリエイティブ支援# 日本語対応

キミ

Kimi

Kimi is an AI chat and agent service from Beijing-based Moonshot AI. Its open-weights flagship model Kimi K3 handles a 1M-token context with image and video input, and can take on slide creation, Deep Research, and coding. Chat is free, paid plans start at $19/month, and the API is priced in USD. The UI is mainly English/Chinese, but Japanese input and output work.

# 生成AI（LLM）# AIチャットボット# テキスト生成# コード生成# AIエージェント# API・SDK

マイクロソフトコパイロット

Microsoft Copilot

An AI assistant from Microsoft, free to use on the web, Windows, and mobile apps, with chat, web-grounded answers, image generation, and voice conversation. The paid consumer plan is Microsoft 365 Premium (JPY 3,200/month, tax included); for business there is Microsoft 365 Copilot integrated into Word, Excel, and Teams (from JPY 4,497/user/month, tax excluded). Full Japanese support.

# 生成AI（LLM）# AIチャットボット# AIエージェント# テキスト生成# 業務効率化# 日本語対応

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