AI Fanfic Generator: 9 Best Tools to Write Fanfiction with AI

Fanfiction has always been a creative haven for those who want to dive deeper into the worlds they love, be it romance, fantasy, or sci-fi. Now, with AI fanfic generators, storytelling has never been more accessible or dynamic. Whether you're facing writer's block, struggling with plot structure, or just looking for inspiration, AI fanfiction tools can jumpstart your imagination.

But here's the catch: not all tools are created equal. Some limit your content, others lack creative depth, and a few just aren't beginner-friendly. That's where this guide comes in. We'll explore the 9 best AI fanfic generators, comparing their features, creativity, and usability.

Part 1: Review of 9 AI Fanfic Generators

1. Toolsmart

Toolsmart AI Fanfic Generator is an intuitive, web-based platform that lets you create original fanfiction stories within seconds. Whether you want to explore romantic storylines, dive into sci-fi adventures, or rewrite scenes from your favorite fandoms, Toolsmart makes it easy for anyone to write compelling narratives using AI.

Features:

• Genre-specific prompts for romance, fantasy, horror, and more

• A clean, clutter-free interface with no login required

• Free access with no subscription barriers

• Fast generation with editable and rewordable results

• Bonus tools like AI image generator, rewriter, and subtitle tool

Pros:

• Absolutely free AI fanfic generator

• No account is needed; just visit and write

• Excellent support for different fandoms and custom themes

• Great for short- and long-form content

• Supports AI fanfic generator romance genre

Cons:

• Doesn't save previous generations unless copied

• No advanced formatting tools (e.g., Markdown or rich text)

As someone who's tested a dozen AI fanfiction generators, Toolsmart quickly became my go-to. The freedom to create unfiltered stories, especially in niche fandoms or romantic fanfic genres, without having to sign up or pay is a massive win. Its simplicity makes it perfect for beginners, while the results are surprisingly engaging for advanced users, too. If you're after an AI fanfic generator with no filter, this is the one I'd recommend first.

2. Rytr

Rytr is a versatile AI writing assistant designed for all types of content creation, including storytelling. While it's not strictly a fanfic generator, it does allow you to write creative fiction with prompts, tone adjustments, and genre-specific tweaks. It's especially useful for generating dialogue, character intros, and plot outlines.

Features:

• Supports 30+ languages and 20+ tones

• Built-in templates for creative writing and storytelling

• Offers AI-generated plot ideas, summaries, and dialogues

• Allows editing, expanding, or shortening content in one click

Pros:

• Great for developing short scenes and character arcs

• Includes a "Story Plot" use-case that can be repurposed for fanfic

• Allows precise control over tone and creativity

• Offers a limited free plan

Cons:

• Not built specifically for fanfiction writing

• Lacks fandom-focused tools or genre tagging

• Free tier has strict usage limits

I tried using Rytr as an AI fanfiction generator, and while it's not tailored to fanfic by default, the flexibility of prompts made it possible to craft fun story starters and scenes. It's ideal if you want to experiment with fanfiction AI tools but still prefer some manual control. However, if you're looking for something fully immersive and fandom-driven, Rytr may feel a bit too general-purpose.

3. NovelAI

NovelAI is a premium AI fanfiction generator built specifically for long-form storytelling. With deep customization, memory for plot continuity, and genre-tuned AI models, it's one of the most powerful tools for fanfic writers who want serious creative control.

Features:

• Advanced AI trained in fiction and literature

• Persistent memory for characters and story context

• Customizable story modules for different genres

• Highly flexible prompt and editing system

• Visual theme editor for immersive writing experience

Pros:

• Ideal for romance, fantasy, or mature fanfics

• Feels like writing with a creative partner

• Excellent for long-form or episodic storytelling

• AI fanfic generator with no filter, high freedom and minimal censorship

Cons:

• No free version (only paid plans after the trial)

• Can be overwhelming for casual users

• Steeper learning curve than simpler tools

NovelAI is what I'd call the dream platform for serious fanfiction authors. It handles romance arcs, character development, and plot twists incredibly well. And best of all? There's virtually no filter, so you're free to write unfiltered fanfic in any genre, including darker or niche storylines. If you're looking for the best AI fanfic generator for creative freedom and depth, this is easily one of the top contenders.

4. Deepstory

Deepstory is an emerging AI fanfiction generator that leans into plot development and character interaction. It's a browser-based tool designed to help writers flesh out storylines, write dynamic conversations, and build immersive worlds from scratch.

Features:

• Supports story generation across genres and fandoms

• Allows you to create and manage characters

• AI generates dialogue, events, and internal monologue

• Interactive editor that learns from your plot progression

• Focused on helping users build narrative flow

Pros:

• Easy for new writers to explore character dynamics

• Encourages plot growth and emotional arcs

• Good for fanfics that emphasize relationships or adventure

• Free access with optional account creation

Cons:

• Occasional randomness in AI responses

• Limited formatting and export options

• Not as polished as some premium tools

Using Deepstory felt like brainstorming with a co-author. The AI often surprised me with how it developed character motivations, especially in romance-heavy fanfiction. It might not be the most refined platform, but for writers who want a tool that generates story flow with minimal restrictions, it's a solid starting point. It's also a good choice for anyone experimenting with a fanfiction AI tool that values character complexity over polished grammar.

5. Sudowrite

Sudowrite is a premium AI writing tool created with novelists in mind. While not strictly a fanfic generator, it excels at enhancing your writing, generating new plot ideas, and helping you overcome writer's block. It's one of the best tools for polishing existing fanfiction or expanding it with rich sensory detail and believable dialogue.

Features:

• "Describe," "Rewrite," and "Continue" tools for story expansion

• Brainstorm plot twists, character arcs, and emotional beats

• Supports genre-based writing (romance, fantasy, sci-fi, etc.)

• Suggests metaphors, similes, and sensory language

• Allows long-form storytelling with memory support

Pros:

• Amazing tool for overcoming writer's block

• Highly creative and unique output

• Strong support for romantic, emotional, and introspective writing

• Helpful for polishing and deepening AI fanfic generator romance stories

Cons:

• Not free, offers a short trial only

• Requires some writing input before generating text

• Less useful for complete story generation from scratch

Sudowrite is like a creative partner that takes your rough idea and turns it into something poetic. While it's not a full AI fanfiction generator in the traditional sense, it's a must-have for anyone who's serious about writing immersive and emotionally rich fanfics. I've used it to fine-tune romantic dialogue and bring emotional tension to life, especially in scenes where I felt stuck. Sudowrite is an incredible sidekick for writers who want to elevate their fanfiction.

6. Writesonic

Writesonic is an all-in-one content creation tool that also functions as an AI fanfiction generator with the right inputs. While it's mainly designed for marketing copy and blogs, its long-form editor and custom prompt generator make it a surprisingly effective platform for creative writing, including fanfic.

Features:

• AI Article & Story Writer for custom prompts

• "AI Chat" for interactive storytelling

• Templates for introductions, plots, and summaries

• Supports 25+ languages and various tones

• Browser-based with mobile compatibility

Pros:

• Easy to use for quick fanfic scenes or one-shots

• Offers a free trial for exploring storytelling tools

• Works well with romance, fantasy, and sci-fi genres

• Good for generating fanfiction AI content with minimal effort

Cons:

• Creative tools aren't as refined as dedicated fiction platforms

• Limited character development in long-form pieces

• Some story results may feel generic without careful prompts

I used Writesonic to generate a short fanfic scenario based on a "friends-to-lovers" romance, and the results were surprisingly decent. With a well-crafted prompt, it gave me a solid structure for the scene, complete with dialogue and emotional beats. While it doesn't match the depth of tools like NovelAI or Sudowrite, it's still a solid AI fanfiction generator for writers who want quick, readable drafts without too much setup. Great for testing out ideas or overcoming a writing slump.

7. AI Dungeon

AI Dungeon is a popular AI fanfic generator known for its limitless, interactive story creation. Originally built as a text-based RPG, it has evolved into a dynamic tool for creating custom fanfiction across any genre, from romance to sci-fi to historical epics. Its real-time storytelling style makes it feel like you're collaborating with an improv storyteller.

Features:

• Real-time story generation and interaction

• Choose from custom prompts, genres, or fandoms

• Freedom to write unfiltered content with premium access

• World-building and character memory tools

• Multiplayer and collaborative writing options

Pros:

• Ideal for adventurous and spontaneous fanfiction

• Supports niche fandoms and unique plotlines

• AI fanfic generator with no filter option with a subscription

• Great for writers who enjoy interactive storytelling

Cons:

• The free version has filters and usage limitations

• Some randomness in AI responses

• The interface can be confusing for new users

AI Dungeon is probably the most fun and experimental AI fanfiction generator I've used. You can create wild, unpredictable plots, insert yourself into fantasy worlds, or explore "what-if" scenarios with your favorite characters. If you're writing romantic fanfic, the premium version is worth exploring for its lack of restrictions and full creative freedom. Just be prepared for the occasional quirky AI twist; it's part of the charm.

8. StoryAI (Writeholo)

StoryAI (Writeholo) is a creative writing assistant tailored for storytelling, with a focus on helping writers build structured and emotionally engaging narratives. It's especially effective for those working on romantic, sci-fi, or fantasy-based fanfiction AI projects. While still growing in popularity, it's a strong contender for long-form and character-driven fanfics.

Features:

• Genre-specific templates and story starters

• Options to guide plot direction with character inputs

• AI remembers and expands plot points consistently

• Includes dialogue, emotion cues, and scene formatting

• Regular updates and feature improvements

Pros:

• Strong in building emotional scenes and character chemistry

• Great for romance fanfics and soft slice-of-life narratives

• User-friendly layout and clean UI

• No need for extensive prompt crafting

Cons:

• Still in beta, with occasional bugs

• Doesn't offer a fully free version (only limited access)

• Smaller user base and fewer tutorials available

I tried using StoryAI to write romantic fanfic based on a slow-burn trope, and it nailed the emotional pacing beautifully. Unlike other tools that rush into plot twists, Writeholo lets the story breathe. It's definitely a tool I'd recommend for fans of AI fanfic generator romance who want to focus on subtle details and emotional arcs. It's not the most advanced platform yet, but it shows a lot of promise.

9. TopMediai AI Writing Tool

TopMediai AI Writing Tool may not be a mainstream name yet, but it offers a set of handy writing tools that can generate short-form creative content, including fanfiction. While it's better known for its music and lyrics generator, it does include features for story creation that can help you brainstorm or build short fanfic scenes.

Features:

• AI-powered writing tools for storytelling and music

• Simple interface with prompt-based input

• Fast, one-click generation

• Supports emotional tone and basic genre tagging

• Includes translation and paraphrasing tools

Pros:

• Great for beginners looking for a quick fanfic idea

• Lightweight tool with a minimal learning curve

• Includes options for romantic, dramatic, or poetic tones

• Free access available

Cons:

• Limited output length and story control

• Not optimized for long-form or episodic fanfiction

• Few customization features for fandom-specific content

TopMediai might not replace more advanced fanfiction AI tools, but it's a good place to experiment with short story ideas or generate snippets for social media fan content. I tested it with a simple prompt involving two characters from a well-known anime, and it generated a sweet, emotionally grounded scene. It's a great option for those looking for a free AI fanfic generator with instant results and zero complexity.

Part 2: Comparison of the 9 AI Fanfic Generators

Key Takeaways:

• Best free & simple AI fanfic generator: Toolsmart

• Best long-form, advanced tool: NovelAI

• Best for interactive fanfiction: AI Dungeon

• Best for romance + story polish: Sudowrite & StoryAI

• Best for beginners testing quick ideas: TopMediai

Part 3: Toolsmart – Best Fanfic Story Generator

Among all the tools tested, Toolsmart clearly stands out as the best AI fanfic generator for writers who value ease, speed, and creative freedom.

Whether you're crafting a romantic scene between iconic characters, experimenting with fantasy storylines, or trying to write your very first fanfic, Toolsmart delivers instant results without filters, fees, or login walls. That makes it an ideal solution for both beginners and experienced fanfiction authors looking to move fast and freely.

Why Toolsmart Is the Best:

• Genre-driven prompts tailored to romance, fantasy, sci-fi, and more

• Fast story generation without clutter or delays

• No login or subscription — jump in and start writing

• Free access with zero hidden costs

• Unfiltered creativity — explore mature themes or niche fandoms

• Bonus tools like subtitle generator, image generator, and rewording assistant

Unlike many fanfiction AI tools that either require a subscription or restrict your creativity, Toolsmart embraces freedom. You can generate multiple drafts, tweak outputs, and regenerate endlessly, perfect for testing plot twists or exploring different character dynamics.

From my own experience, what really sets Toolsmart apart is its balance between simplicity and power. It's rare to find a free AI fanfic generator that gives you this much control with so little effort.

Part 4: How to Use Toolsmart AI Fanfic Generator Step-by-Step

Using Toolsmart to write your fanfiction is fast, intuitive, and requires zero learning curve. Whether you want to draft a romantic one-shot or build an entire fantasy saga, this AI fanfic generator helps you get started in just a few clicks.

Here's how to do it:

Step 1: Visit the Toolsmart Website

Go to https://www.toolsmart.ai/

Step 2: Select "AI Story Generator"

Click on the AI Story Generator option from the list of AI Tools.

Step 3: Enter Your Characters, Themes, or Genre

Type in the details of your fanfic: your characters, the relationship dynamic (e.g., friends to lovers), the genre (e.g., romance or sci-fi), and any plot idea or scene setup.

Step 4: Click "Write"

Once your prompt is ready, hit the Write button. In just a few seconds, Toolsmart will create a unique fanfic story for you.

Step 5: Edit, Copy, or Regenerate

Not satisfied with the first version? Click the "Write" button again for a new variation, or use the Edit and Reword tools to tweak the output. Once you're happy, just copy and paste your story wherever you like.

Honestly, this is the smoothest fanfiction writing process I've found. Toolsmart doesn't overwhelm you with settings; it just gets the job done. I've generated romantic scenes, emotional character moments, and even fandom crossovers in under five minutes. If you're looking for a free AI fanfic generator with no filter, this tool hits every mark.

FAQs

Q1: Is there an AI that can write fan fiction?

Yes, there are several fanfic generator AI tools that can help you write fanfiction. These platforms use artificial intelligence to create original stories based on your prompts, characters, and themes. Popular options include Toolsmart, NovelAI, and Sudowrite, each offering a unique way to generate and expand your fanfic ideas.

Q2: Is there a free AI story generator?

Absolutely! Toolsmart is one of the best free AI fanfic generator platforms with no sign-up required. Other tools like AI Dungeon also offer limited free access. While some platforms require subscriptions, there are definitely options to get started without paying.

Q3: Do fanfic generators AI support multiple genres?

Yes, most AI fanfic generators support a variety of genres, including romance, fantasy, adventure, sci-fi, and even niche fandoms. Tools like StoryAI, Toolsmart, and AI Dungeon allow you to customize the genre and tone for a more personalized story experience.

Q4: Does the Toolsmart AI Story Generator create unique stories every time?

Yes! Every story is generated based on your custom prompt. Even when you use the same characters or theme, the AI adapts and creates unique fanfic with new plot twists, conversations, and outcomes each time you click Generate.

Q5: Do I need to sign up for an account to access Toolsmart's free features?

Nope, no account is needed! You can go straight to the Toolsmart AI fanfiction generator, enter your prompt, and generate stories instantly. Everything's available for free right from the homepage.

Summary

In today's world, you don't have to wait for inspiration to strike. With the right AI fanfic generator, you can start writing compelling, creative stories at any time.

We've reviewed nine of the top tools available in 2025, from powerful platforms like NovelAI and Sudowrite to user-friendly options like AI Dungeon and StoryAI. Each tool has its strengths, but when it comes to ease of use, genre versatility, free access, and unfiltered creativity, Toolsmart clearly leads the pack.

Whether you're writing for fun, exploring new fandoms, or building a deep emotional romance, Toolsmart offers a perfect entry point for both casual writers and serious fanfic creators. So go ahead, open Toolsmart, pick your characters, set the scene, and let the AI do the magic.