The 7 Best AI Writing Software for Authors in 2026

The AI writing software market has exploded in recent years. But not all tools are created equal, especially if you are looking for quality creative writing assistance. We have tested and compared 7 AI writing tools to help you choose the one that best fits your writing project.

1. Plumora — Best for voice-preserving AI writing

Plumora is the only AI writing platform designed to preserve your unique authorial voice. Its approach is unique: rather than generating generic text, Plumora learns your style through its Style DNA technology and generates content that sounds like you.

Strengths:

• Integrated Codex (project bible: characters, locations, events, universe rules)
• Style DNA: AI writes with your voice, not a generic one
• Incarnation Mode: dialogue directly with your characters
• Automatic narrative inconsistency detection
• Multi-AI support (Claude, GPT, Mistral) so you can choose the best model for each task
• Free plan available with no credit card required

Weaknesses:

• Newer platform, still building its community
• Feature set expanding rapidly but not yet exhaustive

Our verdict: The top choice for any author who wants AI assistance without losing their voice. Plumora's combination of Style DNA, the Codex, and inconsistency detection is unmatched.

2. Sudowrite

Sudowrite is one of the pioneers of AI fiction writing. Launched in 2021, it popularized the idea of a dedicated AI writing assistant for fiction authors, with features like Describe (enrich descriptions), Expand (develop a passage), and Story Engine (guided long-form generation).

Strengths:

• Intuitive, well-designed interface
• Story Engine for long-form guided generation
• Strong English-language community

Weaknesses:

• Limited multilingual support
• No project bible or Codex equivalent
• High pricing (starting at $19/month)
• No inconsistency detection

3. NovelAI

NovelAI stands out with AI models trained specifically on fiction. The tool offers significant creative freedom and high-quality text generation for experimental and genre fiction.

Strengths:

• Fiction-trained AI models
• Great creative freedom (minimal content restrictions)
• Integrated image generation

Weaknesses:

• Aging interface
• No structural tools (no chapters, no Codex)
• Variable quality in non-English languages

4. Genario

Genario is a French-made tool that offers an AI writing assistant focused on structuring narratives and generating detailed outlines.

Strengths:

• Designed for the French-speaking market
• Good story structuring tools

Weaknesses:

• More limited generation capabilities than competitors
• No style personalization feature

5. WriteControl

WriteControl is a writing software that progressively integrates AI features. It is particularly appreciated for its organization and planning tools.

Strengths:

• Excellent organization tools
• Character sheet management
• Available in French

Weaknesses:

• AI capabilities still limited compared to competitors
• No advanced text generation

6. AizyBook

AizyBook takes an all-in-one approach to book creation with AI, covering everything from writing to formatting and layout.

Strengths:

• End-to-end workflow (writing plus formatting)
• Accessible interface for beginners

Weaknesses:

• Less focused on fiction specifically
• Generic generation style

7. ChatGPT (OpenAI)

ChatGPT is the most well-known AI among the general public. Many authors use it by default, but it is not a specialized writing tool.

Strengths:

• Available everywhere, easy to access
• Good for brainstorming and research
• Strong language understanding

Weaknesses:

• No project management (chapters, characters)
• Limited context: forgets everything between sessions
• Generic style that is difficult to personalize
• No integrated text editor

Comparison table

Our recommendation

For serious authors who want to write novels with AI assistance, the choice is clear: Plumora combines the best of AI with an approach centered on your voice, your universe, and your creative vision. Unlike generic tools adapted awkwardly for creative writing, Plumora was built from day one for fiction authors.

Whether you are writing your first novel or your tenth, the right AI writing software saves you time without sacrificing literary quality. Considering Plumora versus Sudowrite? Read our detailed Plumora vs Sudowrite comparison.