Best AI Programs To Write A Book For Free

For writing a book for free, several AI tools offer robust features without cost:

Squibler: Offers a free tier with 6,000 AI-generated words per month, 5 AI image generations, and support for one project with up to 15 chapters. Ideal for structured fiction and nonfiction writing with tools like story generation, character building, and progress tracking.
RaptorWrite: A completely free option perfect for beginners or budget-conscious writers. It focuses on chapter-by-chapter generation with a simple, distraction-free interface, requiring no AI API key.
ChatGPT (Free Tier): Accessible via OpenAI’s free plan, it excels in brainstorming, outlining, and real-time editing. While not designed as a full book-writing engine, it supports flexible, conversational drafting across genres.
Writesonic: Provides a free plan with limited word count, suitable for fast drafting and testing story ideas before committing to paid features.
NovelAI: Offers a free tier with access to creative, privacy-focused writing tools like story continuation and lorebook features, especially popular for fantasy and fan fiction.
Goblin Tool’s Formalizer: A lesser-known but powerful free tool with 16 paraphrasing styles and high word output, useful for refining and restructuring content.

While free tools are excellent for experimentation and initial drafts, paid versions (like Squibler Pro or Jasper) unlock full capabilities such as unlimited words, advanced project management, and professional formatting—ideal for completing full manuscripts.

In 2026, Squibler provides a comprehensive free tier designed for authors of both fiction and non-fiction.

Key features of the 2026 Free Plan include:

AI Generation Limits: 6,000 AI-generated words per month.
Visual Content: 5 AI-powered image generations per month for illustrations or cover art.
Project Structure: Support for 1 project consisting of up to 15 chapters (files).
Story Management: Access to 8 “Elements” (character profiles, settings, or objects) without folder grouping.
Creative Tools: Use of the “Smart Writer” to expand scenes, rewrite paragraphs, or generate outlines.
Additional Features: 30-day version history and collaboration with “edit-only” sharing permissions.

For professional writers needing more capacity, the Squibler Pro plan is available for approximately $16/month (billed annually) or $29/month, offering unlimited AI words, unlimited projects, and one physical copy of your completed book.

RaptorWrite is a free AI writing tool developed by Future Fiction Academy, designed specifically for authors working on long-form fiction. It provides a clean, distraction-free interface with integrated AI assistance for brainstorming, outlining, drafting, and editing entire novels.

Key Features:

Free to use: No subscription cost. The core platform is completely free.
AI integration via OpenRouter: Connect your own API key to access multiple AI models (e.g., Claude, GPT, Gemini) and switch between them based on task.
Context control: You decide what information (e.g., character notes, plot outline, worldbuilding) the AI sees before generating text, improving relevance and consistency.
Multi-document view: Keep your outline, manuscript, and research open side-by-side for seamless writing.
Project organization: Use folders to manage chapters, notes, and character sheets.
Version snapshots: Save and revert to previous versions of your work.
Prompt library: Save and reuse custom prompts tailored to your writing style.

How It Works:

Sign up through the Future Fiction Academy.
Create an account on OpenRouter and generate an API key.
Input your API key into RaptorWrite.
Start writing with AI support—pay only for the AI usage through OpenRouter (costs vary by model).

While RaptorWrite doesn’t host its own AI models, it acts as a powerful front-end that gives writers full control over AI inputs and outputs. It’s ideal for beginners or budget-conscious authors who want to explore AI-assisted writing without financial risk.

I Tested 100,000 AI Writing Prompts (Here’s What Works)

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