AI Services in Idea Support / Creative Tools

Tools that help expand thinking and spark new ideasFeaturing 15 AI services in total.

シーダンス

Seedance

Seedance is an AI video generation model developed by ByteDance (China). The latest Seedance 2.5 supports up to 30 seconds of continuous generation and up to 50 reference assets (images, video, audio). General users access it via Dreamina international or CapCut; developers use the BytePlus API. Free daily credits are available, with USD-based credit plans and pay-as-you-go API pricing.

# 動画生成# 品質向上・クリエイティブ支援# API・SDK# アイデア支援／創造ツール# マーケティング

ワン

Wan

Wan (Tongyi Wanxiang) is Alibaba's family of AI video and image generation models with an official online service. Wan2.1/2.2 are open models under Apache 2.0, and the latest Wan 3.0 (beta) supports native 30-second generation. Free daily credits on wan.video, with paid plans from $5/month (billed yearly); billing is in US dollars.

# 動画生成# 画像生成# 品質向上・クリエイティブ支援# API・SDK# アイデア支援／創造ツール

ユーディオ

Udio

An AI music generator (by Uncharted Labs) that creates full songs with vocals from a text prompt. It supports lyrics/style control, extend, inpainting, and audio upload — but since its 2025 Universal Music Group partnership it has become a closed platform, and downloading your generated songs is currently disabled (use stays on-platform). Free plan available, credit-based.

# 音楽生成# アイデア支援／創造ツール# エンタメ／ゲーム・遊び

ステーブルディフュージョン

Stable Diffusion

A family of open-weight image-generation AI models developed by Stability AI. The current flagship is Stable Diffusion 3.5 (Large / Large Turbo / Medium). You can download the weights for free and run them locally (GPU required), and it is also usable via the official API, DreamStudio, ComfyUI, and more. Under the Community License, commercial use is free for under $1M in annual revenue (prompts are mainly in English).

# 画像生成# 生成AI（LLM）# アイデア支援／創造ツール# 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

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

プレイグラウンドエーアイ

Playground AI

An AI design studio for creating logos, T-shirts, stickers, posters, social images and more from text (pivoted from a former general image-generation AI). Founded by Suhail Doshi (co-founder of Mixpanel). Alongside its own PGv3 model you can choose Nano Banana or GPT Image 2, with templates and non-destructive editing. Pricing is credit-based from Free to Pro Plus $45. The old playground.com domain is consolidated into playgroundai.com.

# 画像生成# アイデア支援／創造ツール

ナイトカフェ

NightCafe

An AI art platform that brings the latest image and video generation models—Flux, DALL-E 3, Nano Banana, Veo—together in one place, with a community and daily challenges for sharing work. Commercial use is allowed even on the free plan.

# 画像生成# アイデア支援／創造ツール

ロバート

Lovart

Lovart is "the world's first AI design agent," generating everything from logos, posters, and packaging to ads and video from a single sentence. On an infinite canvas it chains multiple cutting-edge image/video models (Nano Banana, GPT Image, Flux, Veo, Sora, etc.) to carry work from planning to a full set of designs. It has a Brand Kit and PSD export, and a Japanese UI. Credit-based pricing: Starter from ¥2,945/mo / Basic / Pro / Ultimate (free trial available).

# デザイン生成# 画像生成# 動画生成# 音声生成# 音楽生成# アイデア支援／創造ツール# 品質向上・クリエイティブ支援# AIエージェント

イメージトゥプロンプト

Image to Prompt

Image to Prompt is a web tool that turns a reference image into prompts for AI image generators. Upload an image and it analyzes nine aspects—subject, composition, lighting, color, style and more—then writes six prompts at once: general-purpose plus versions for Midjourney, FLUX, Stable Diffusion, ChatGPT Image and Nano Banana. You can edit and copy the results on the spot and save them to History when signed in. Try three images free without signing up; paid options are a one-time $4.99 pack (300 credits) and Pro at $9.90/month (English only).

# 画像生成# 顔認証・画像解析# アイデア支援／創造ツール# 品質向上・クリエイティブ支援

チャチャ

Chacha

An AI creation community (formerly Anirole; now chacha-ai.io) where you build your own AI characters and enjoy chat/roleplay plus anime-style illustration generation. Adult-leaning, centered on romance and character conversation, with posting/browsing. USD-denominated diamond credits.

# AIチャットボット# ボイスボット# 品質向上・クリエイティブ支援# アイデア支援／創造ツール# エンタメ／ゲーム・遊び# 日本語対応

ビジュアルエレクトリック

Visual Electric

Visual Electric was a tool that let designers generate and edit AI images on an infinite canvas, but in October 2025 Perplexity acquired its team and the service was wound down over roughly 90 days (ending in early 2026). Users were offered data export and prorated refunds on their subscriptions, and the development team joined Perplexity. This page summarizes how the shutdown came about, the handling of data, and routes to alternative services (Leonardo.Ai, Krea, Recraft, Perplexity, and others).

# 画像生成# アイデア支援／創造ツール

マッピファイ

Mapify

An AI tool that summarizes PDF, Word, PowerPoint, YouTube videos, web pages, audio, images, and long text into mind maps. Developed by the team behind the mind-mapping software Xmind, with the web version operated by SUPERMIND PTE. LIMITED in Singapore. You can ask AI about the content while viewing the map, expand branches to add ideas, present maps as slides, and export to PDF, Markdown, or SVG. Available on the web, as a browser extension, and as iOS/Android/macOS apps, with maps generated in 31 languages including Japanese. Free plan: 30 credits (one-time); paid plans start at Basic ¥1,599/month as displayed in Japan (¥959/month billed yearly).

# 要約・翻訳# アイデア支援／創造ツール# 生産性向上# 日本語対応

ルームヴァーナ

Roomvana

Roomvana is an AI interior design tool: upload one photo of a room, pick a style, and it redesigns the space while keeping the real walls, windows and layout in place. Beyond restyling in 23 styles, it can repaint walls, try wallpaper, refinish cabinets, virtually stage empty rooms, remove or add furniture, and redesign exteriors, roofs and yards. It runs in the web browser and as an iOS app and is free to try (designs are watermarked). Paid options are one-time credit packs (from $14.99 for 30 credits, never expiring) or a membership at $9.90/month or $59.99/year. The interface is in English.

# 画像生成# デザイン生成# 不動産# アイデア支援／創造ツール

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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