Writing a book in 2025 has never been easier or more efficient. Thanks to AI writing tools, even first-time authors can turn their ideas into well-structured drafts quickly. These tools can help with everything from outlining and plot development to grammar fixes and editing. But which ones truly deliver?
Here’s a detailed, up-to-date guide to the 10 best AI for writing a book in 2025. Whether you’re looking for the best AI book writer free, or want a robust paid platform, this list covers it all.
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Talk to a Human WriterThe 10 Best AI For Writing A Book In 2025
1. Squibler: AI Smart Writer for Story Development
Best for: Fiction and nonfiction authors who need structure and guidance
Key Features:
- Story generation: Generate outlines, chapters, or summaries from a simple prompt.
- Character building: Create detailed character arcs and relationships.
- Scene templates: Fill in the blanks with plot-focused AI prompts.
- Progress tracking: Track word count, chapters, and writing deadlines.
Why it’s great: Squibler remains one of the best AI book writer free options with a generous free tier. Its intuitive dashboard and pre-built book templates are great for authors looking to self-publish efficiently. Many indie authors use Squibler to complete their first drafts in weeks instead of months.
AI Can Start It — We Help You Finish Strong
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Make It Publish-Ready2. Jasper AI: Versatile and Voice-Matched AI For Book
Best for: Authors seeking brand voice or tone-matching capabilities
Key Features:
- Voice replication: Train Jasper to write in your unique style.
- Command mode: Use natural language to generate custom content.
- Templates for books: Create outlines, chapter intros, and back-cover blurbs.
Why it’s great: Jasper isn’t just powerful; it’s intuitive. It’s perfect if you’re writing both fiction and non-fiction. Jasper helps ensure your tone and message remain consistent, especially across long-form writing. Authors often use Jasper to create detailed marketing materials that align with their books.
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Book a Free Strategy Call3. ChatGPT (Powered by GPT-4): Creative and Flexible
Best for: Writers who want tailored, conversational support
Key Features:
- Genre flexibility: From sci-fi to memoirs, ChatGPT adapts to all genres.
- Interactive brainstorming: Collaborate with the AI to plan plots, characters, or themes.
- Real-time rewriting and editing: Improve drafts instantly.
Why it’s great: OpenAI’s ChatGPT, especially with GPT-4 and newer, is a top-tier AI for writing books. It blends creativity with technical accuracy, letting you explore ideas and refine them easily. The conversational aspect makes it feel like you’re brainstorming with a real collaborator.
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Start Your Book Today4. Writesonic: Affordable and Feature-Rich
Best for: Budget-conscious authors needing quality without breaking the bank
Key Features:
- Templates for fiction, blogs, and business books
- Scene and dialogue generators
- Grammar correction + style rewrites
Why it’s great: Writesonic offers both free and paid plans. It’s ideal for those looking for a book writing AI free tool that also scales as your needs grow. It’s great for fast drafting and for authors aiming to test story ideas quickly before committing to full-length projects.
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Get Expert Help Now5. Sudowrite: Best AI Book Writer for Fiction Writers
Best for: Creative writers focusing on storytelling, character, and plot
Key Features:
- Describe mode: Add vivid, sensory-rich prose instantly
- Rewrite suggestions: Fix plot holes or weak scenes
- Expand mode: Grow scenes or chapters based on simple cues
Why it’s great: Sudowrite feels like a co-author that never tires. It pushes your imagination while keeping your narrative coherent and engaging. It’s especially loved by writers with vivid worlds or emotional character arcs.
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Craft Heartfelt Poetry6. GrammarlyGO: Nonfiction Editing and Content Generation
Best for: Non-fiction writers and business authors
Key Features:
- Auto-rewrites: Improve clarity, tone, and engagement
- AI-generated paragraphs: Get started on a new section with ease
- Context-aware suggestions: Stay professional and accurate
Why it’s great: For nonfiction authors, GrammarlyGO is more than just an editor—it helps draft and improve complex content with simplicity. It’s perfect for reports, memoirs, how-to guides, and educational books.
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Get a Personalized Draft7. AI Summarizer: Refinement & Organization Tool
Best for: Authors working on complex manuscripts needing clarity
Key Features:
- Summarization: Condense scenes, chapters, or ideas
- Clarity-focused rewriting: Simplify convoluted text
- Story reordering: Rearrange narrative arcs effortlessly
Why it’s great: AI Summarizer is one of the best AI book writer support tools if you’re dealing with long manuscripts and need structure. It’s often used by authors transitioning rough ideas into clear outlines.
8. NovelAI: Privacy-Focused AI for Writers
Best for: Writers who want creative control and privacy
Key Features:
- Story continuation: Auto-complete your paragraphs
- Custom AI voice: Adjust tone and genre easily
- Encryption: Keeps your content secure
Why it’s great: NovelAI is ideal for authors who want AI assistance without giving up privacy or ownership rights. It’s especially popular among fantasy and fan-fiction authors.
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Start with a Free Call9. INK Editor: SEO and Writing in One
Best for: Authors publishing non-fiction or blogs as books
Key Features:
- Built-in SEO optimization
- Grammar and readability checker
- AI assistant for sentence restructuring
Why it’s great: INK is perfect if your book includes web-published elements. It ensures your writing ranks and reads well. Many nonfiction authors use it to repurpose blog posts into books.
10. Lex: AI-Powered Distraction-Free Writing
Best for: Minimalist authors focused on pure writing
Key Features:
- Context-aware auto-suggestions
- Simplified interface for focused drafting
- Organized file management
Why it’s great: Lex strips everything down to the writing. Great for authors who want a clean, simple environment paired with smart AI tools. It’s great for avoiding distractions and focusing on your manuscript.
Wrote a Draft Using AI? Let’s Refine It
We take your AI-generated content and turn it into a powerful, human-written book. Editing, structuring, and story development — we handle it all.
Polish My AI BookAI-Powered Writing: The Future of Book Creation is Here!
Writing a book is no easy task, but with the right AI tools, it can be faster, more efficient, and incredibly precise. However, not all AI writing tools are created equal—choosing the wrong one can leave you frustrated, with subpar content that doesn’t reflect your vision.
At Estorytellers, we leverage advanced AI tools combined with human creativity to craft compelling, high-quality books that resonate with readers. Don’t settle for generic, uninspired writing—choose a service that combines the power of AI with the expertise of seasoned writers.
Why DIY AI Book Writing Could Lead to Disappointment
Inconsistent quality – AI lacks the ability to produce coherent, engaging storytelling consistently.
Limited customization – Many AI tools churn out basic content with no personal touch.
Wasted time – While AI can speed up writing, improper usage can lead to poor-quality drafts that require heavy editing.
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Struggling to complete or polish your AI-written draft? Our expert ghostwriters can refine, rewrite, or co-author your book professionally.
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Custom AI Writing – Tools tailored to your book’s genre and style
Human Editing – We ensure every draft is polished and reads like a masterpiece
Time-Saving Efficiency – Get a first draft faster without compromising on quality.
Every moment counts! Turn your book idea into reality today—with Estorytellers!
Why Use AI for Writing a Book?
AI writing tools offer more than just convenience—they’re creative partners. These tools help authors:
- Overcome writer’s block.
- Generate plot ideas and outlines.
- Edit drafts for clarity and coherence.
- Enhance productivity with structured workflows.
By combining human creativity with the precision of AI, authors can bring their stories to life faster and more effectively.
AI Can Write. But Only We Can Captivate.
Tools can generate words, but they can’t feel emotions. Estorytellers blends emotion, experience, and engagement to turn your ideas into unforgettable books that truly connect.
Why AI Can’t Fully Replace Human Expertise
Even the best AI for writing a book has limitations:
- Lack of emotional depth
- Inconsistent style over long texts
- Flat characters or repetitive phrasing
That’s where Estorytellers steps in. We polish, rewrite, or co-author your AI-generated drafts so your book connects with readers emotionally and creatively.
Let Estorytellers Help You Finish Strong
- Co-authoring support
- Genre-specific editing
- Final formatting and publishing help
Talk to a ghostwriter now and bring your draft to life the right way.
Free AI Tools for Book Writing
For those on a budget, free AI tools can still deliver impressive results. Some of the best free AI for writing a book include:
- Squibler (limited free tier): Great for starting out.
- OpenAI’s GPT Playground: Free to experiment with prompts.
- Writesonic: Offers free credits for initial use.
These tools provide accessible options without the commitment of paid plans.
Parting Thoughts
Choosing the best AI to write a book depends on your goals—do you want to draft fast, polish chapters, or structure a full-length manuscript? From Squibler and Sudowrite for fiction to GrammarlyGO and INK for nonfiction, the right AI tool can save time and unlock creativity.
But remember: even the smartest tools need human touch. At Estorytellers, we work alongside your chosen AI to craft, refine, and elevate your story.
Get started now. Let us help you finish strong.
FAQs About AI Book Writing
1. What is the best AI to write books?
The best AI depends on your needs. For structured writing, Squibler shines. For creative flexibility, OpenAI’s GPT models lead the pack.
2. Can you legally write a book with AI?
Yes, but authors should clarify copyright laws in their region. Most AI-generated content belongs to the person inputting the commands.
3. Can I use AI to write a book for free?
Yes, many tools like Squibler and Writesonic offer free plans. However, premium features may require payment.
4. Which is the best AI for writers?
For fiction, Squibler and Jasper AI are top choices. For non-fiction, GrammarlyGO excels in refining and generating content.
Also read:
5 Best Books On Creative Writing That Stirs Your Creativity
The 5 Best Books On Writing Fiction To Learn From The Experts
