AI Services in Text Generation

AI tools that automatically generate written text and documentsFeaturing 55 AI services in total.

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

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

キミ

Kimi

Kimi is an AI chat and agent service from Beijing-based Moonshot AI. Its flagship model Kimi K3.1 Pro (announced October 24, 2026; 1M-token context; weights due by November 4) handles slide creation, Deep Research, coding, and 3D creation. There is a free plan, paid plans start with Plus at $19/month, and the K3.1 Pro API costs $2 input / $10 output per 1M tokens. The web version has a Japanese display.

# 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

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

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

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

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

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 (4,500 credits), Standard $30 (9,450), and Pro $90 (29,700) plans, with a limited-time $3 Mini plan available until December 16, 2026.

# 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

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

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

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

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

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

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

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

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

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

インフルエンス

Influence

Influence is an AI-assisted social media workspace that helps with everything from planning to drafting. Its AI, Influence IQ, uses your saved Brand Guidelines to suggest campaign posts and dates, then lets you tailor copy and media for each channel and schedule the posts. It supports 30+ destinations including Instagram, X, TikTok, YouTube, LinkedIn, Threads and Bluesky, and can be operated from ChatGPT or Claude via MCP. Available in 10 languages including Japanese; plans start at ¥2,357/month for Starter (excl. tax) with a 7-day free trial.

# マーケティング# テキスト生成# スケジューラー# 業務効率化# データ連携（API連携）# 日本語対応

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

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

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

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

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

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

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

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

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

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

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

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

ソブリンガイザー

Sovereign GaiXer

An on-premises generative AI from FIXER Inc. (Minato-ku, Tokyo). Connect the palm-sized unit (based on Lenovo ThinkStation PGX, NVIDIA Blackwell) to your internal LAN and AI processing is completed inside the unit, letting you use generative AI for summarizing documents, drafting materials, reviewing contracts and answering with reference to internal documents (RAG) without sending company data to the internet. Business apps can be added from the GaiXer App Store, and a "redaction app" co-developed with Iga City comes as standard. The price is a one-time purchase of ¥3,806,400 (excl. tax; includes hardware, software license and 3-year warranty), with no extra charges for generations or users. Lease/installments and a 2-week free trial are available.

# 生成AI（LLM）# テキスト生成# 検索エンジン・RAG# 要約・翻訳# 業務効率化# 日本語対応

フリップエイチティーエムエルファイブ

FlipHTML5

FlipHTML5, provided by Wonder Idea Technology of Hong Kong, turns PDFs, Word and PowerPoint files, and images into page-flipping digital books (digital catalogs and brochures) that you can publish and embed on the web. It includes an AI eBook Generator that builds an outline and layout from a topic or a PDF/Word file, an AI chatbot that answers readers from a published book's content, an AI assistant for polishing, translating, and generating images, and an MCP server for creating and managing books from AI assistants such as ChatGPT. Japanese is supported. Pricing: Free (¥0, 5 books a day, 500 AI points/month) / Pro ¥2,180/month (¥1,808/month billed annually) / Platinum ¥5,100/month / Enterprise ¥14,500/month, plus AI Plus for AI eBooks at ¥3,280/month (¥2,290/month billed annually).

# PDF・文書生成# デザイン生成# テキスト生成# 画像生成# AIチャットボット# マーケティング# 日本語対応

ペーパーパル

Paperpal

An AI English-editing and academic writing tool for research papers from Cactus Communications, the company behind the English editing service Editage. Trained on professional editors' corrections of academic manuscripts, its AI polishes the grammar and wording of English text into an academic tone, and it brings together plagiarism checks, AI-generated text detection, citation checks, a pre-submission readiness check, literature search across more than 300 million papers with citations (10,000+ citation styles), and translation between 50+ languages including Japanese. It works on the web, as a Microsoft Word add-in, and in Google Docs and Overleaf, with a Japanese interface, payment in Japanese yen and a pay-later option for institutional funds. There is a free plan; Prime costs ¥2,090/month billed annually (¥4,290 month-to-month) and Pro ¥5,060/month billed annually.

# 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# 検索エンジン・RAG# 日本語対応

エングヘルパー

Eng-Helper

Eng-Helper is an AI English-correction keyboard for iPhone and Android from Float Co., Ltd. of South Korea. In any app—messages, email, social media—you type English (Japanese mixed in is fine) and tap "Correct"; natural English and alternative phrasings appear above the keyboard, and a tap inserts your pick into the text field. It explains why each change was made in 116 languages, including Japanese. The first two weeks are free, then a monthly subscription (¥500 on the Japanese App Store) gives unlimited corrections and explanations.

# 要約・翻訳# 教育# テキスト生成# 生産性向上# 日本語対応

ゼットエーアイ

Z.ai

The official service for the GLM family of large language models developed by Z.ai (Zhipu AI). In chat (chat.z.ai), GLM-5.3-Flash can write, analyze data and build slides and websites. For developers, Z.ai offers an API (GLM-5.3 costs $1.4 input / $4.4 output per 1M tokens) and the "GLM Coding Plan", a flat-rate plan for using GLM in 20+ tools such as Claude Code and Cline (Lite $18, Pro $80, Max $168 per month). Model weights are published on Hugging Face. Officially supported model languages are English and Chinese, and the interface is in English.

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

ツヅミツー

tsuzumi 2

A fully domestic Japanese large language model (LLM) built from scratch by NTT, Inc. At 30 billion parameters (30B) it runs inference on a single GPU, so it can be deployed on-premises or in a private cloud without sending confidential data outside. It is strengthened in finance, healthcare and public-sector knowledge and in RAG search, summarization and information extraction from documents, and a May 2026 update added reading of documents with charts and tables. Available since October 20, 2025, and selected for trial use in Japan's Digital Agency "Government AI". It is not a self-serve web service: NTT Group companies provide it individually to businesses and local governments as part of their solutions, and pricing is not published.

# 生成AI（LLM）# テキスト生成# 検索エンジン・RAG# 金融# 医療# 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

サイスペース

SciSpace

An AI research assistant for researchers and students from PubGenius Inc. in the US (formerly Typeset). Covering more than 280 million papers across multiple databases, its AI agent handles paper search, literature reviews, data extraction and cited drafts, alongside standalone tools such as Chat with PDF and a citation generator. The interface is in English. Basic is free; Premium is $20/month ($12/month billed annually).

# 検索エンジン・RAG# AIエージェント# 要約・翻訳# テキスト生成# 教育

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

ケーディーピーブックアイオー

kdpbook.io

kdpbook.io is an AI book studio for Amazon KDP (Kindle Direct Publishing). From a one-sentence idea or your own manuscript (Word, PDF, Markdown or plain text), its AI writes, illustrates and typesets 36 book types, including picture books, coloring books, puzzle books, journals, novels, non-fiction and comics, and applies KDP's trim, margin, bleed and spine rules in code. It exports an interior PDF, a full-wrap cover PDF with back, spine and front in one piece, a Kindle EPUB and a listing sheet. Books can be made in 34 languages including Japanese (the interface is in English). New accounts get 2,000 free credits (no card required; free exports are watermarked and not for sale), and paid plans are Starter $25, Author $49 and Studio $99 per month (excluding tax).

# テキスト生成# 画像生成# PDF・文書生成# 生成AI（LLM）# 品質向上・クリエイティブ支援# アイデア支援／創造ツール

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