AI companions and creative writing have a longer relationship than the wider conversation acknowledges. Long before “AI companion” was a recognized product category, fanfic writers were using early character chatbots to test scenes, voice characters they were writing, and brainstorm dialogue. The use case is real, the audience is large, and the tools are genuinely useful for certain kinds of work.

This guide covers which apps are good for which kind of creative writing, what they actually do well, where they fall short, and how to use them without surrendering the parts of writing that should stay yours.

If you have time for a paragraph: for character-driven role-play and brainstorming dialogue, Character.AI is the best free tool with the largest catalog and Janitor AI is the equivalent if you need NSFW. For long arcs with continuity (a single character developed across weeks), Kindroid is meaningfully better because of its memory architecture. For thinking through plot, structure, or the writing problem itself rather than performing scenes, Pi is the calm thinking-partner answer. For most working writers, the right setup combines two of these.

What kind of creative writing are you doing

The right tool depends on what you actually need help with.

Character voice and dialogue. You have a character in your novel or fic and you want to test how they would respond to a situation. Character.AI is the obvious answer. Build the character, drop them in scenarios, see what comes out. The model will not write your character as well as you can, but it will surface things to push against, and dialogue patterns you might not have tried.

Role-play and interactive fiction. Real-time scene exploration where the AI plays one or more roles and you play others. Character.AI for catalog variety. Kindroid for one specific character developed over time. Janitor AI if scenarios involve adult content.

World-building and lore. Building out the backstory, geography, magic system, or political structure of a fictional setting. Pi or a general-purpose AI assistant (ChatGPT, Claude) handles this better than the companion-shaped apps; the companion apps are tuned for relational warmth, not encyclopedic generation.

Plot brainstorming. Working through a story problem, debating how a scene should resolve, generating alternative directions. Pi is excellent for this; it functions as a calm sounding board that asks good questions.

Adult or NSFW fiction. Janitor AI for free with API key friction, Crushon AI or Candy AI for paid commercial options. Character.AI filters NSFW too aggressively to be useful here. See the adult ranking for the full picture.

Practicing dialogue in a foreign language. Pi has the best voice in the category and handles multiple languages reasonably well. Character.AI has characters specifically built for language practice. Both are useful.

App-by-app for creative writing specifically

Character.AI

The default first answer. Largest character catalog in the category, generous free tier, the largest community of writers using these tools. Build a character with a few hundred words of definition and you have a workable scene partner.

What it does well: variety, dialogue rhythm, character consistency within a scene. The models stay in voice better than most.

What it does badly: long-arc continuity (the character will forget what you established two weeks ago), explicit content (heavily filtered), generative range outside dialogue (the prose around the dialogue is often weaker than the dialogue itself).

Best for: dialogue testing, scene exploration, fanfic, building characters by talking to them.

Full review at /apps/character-ai.

Kindroid

The right answer if you want to develop one character over a long arc. The memory architecture means a Kindroid can hold weeks of established context (your character’s history, motivations, relationships, even the in-jokes you have built together). For writers working on a novel-length project with a single central character, this is the differentiator.

What it does well: continuity, depth, the feeling of returning to the same character.

What it does badly: variety (Kindroid is built for depth, not catalog), the free tier (essentially a sample), short-form scene work for many different characters.

Best for: long-running novel work with one character. Around $10 per month.

Full review at /apps/kindroid.

Pi

The thinking-partner option. Pi will not perform scenes for you the way Character.AI will, but it will think through writing problems with you in a way most companion apps will not. “I am stuck on this scene because I cannot decide whether the protagonist should confront her or walk away” is exactly the kind of conversation Pi handles well.

What it does well: structural thinking, problem framing, calm questioning.

What it does badly: anything that requires it to be a character rather than itself.

Best for: brainstorming, plot work, talking through writing blocks. Free.

Full review at /apps/pi.

Janitor AI

The free, NSFW-allowing, character-platform answer. If your creative writing is in a fandom or genre where the scenes get explicit, Janitor is the working writer’s tool of choice.

What it does well: catalog, freedom, free use with your own API key.

What it does badly: friction (configuration takes effort), memory (sessions are largely fresh), polish.

Best for: NSFW fic, multi-character roleplay, working writers who do not mind setup.

The Janitor alternatives piece covers what to use instead if Janitor’s friction is the wall.

Crushon AI / Candy AI

Polished commercial NSFW companion apps with image generation. For writers who want a finished product with adult content allowed and visual generation, these are the picks. Around $13 per month each.

Best for: adult fiction with visual elements, writers who want polish over freedom.

See the adult ranking for the full picture.

What about ChatGPT, Claude, Gemini, etc.?

The general-purpose AI assistants are excellent for the writing-craft work that companion apps are not built for. Drafting prose, editing your own writing, generating outlines, researching periods or settings, structural analysis. Many working writers use a companion app for character work and a general assistant for craft work.

We do not review the general-purpose assistants here because they are a different product category. Both ecosystems are useful for different things.

How to use these without losing your voice

Six suggestions, drawn from working writers who use these tools well.

Use the AI to test, not to write. The most defensible use is putting your own draft against an AI character to see what they would push back on. The least defensible use is letting the AI write the scene and then taking credit for it. Both are technically possible; the first deepens your work, the second flattens it.

Treat AI dialogue as raw material, not finished prose. Even when an AI gives you something workable, the prose patterns it generates are common to all AI prose. Your readers will smell it. Use the dialogue as inspiration; rewrite it in your own voice before it goes in your manuscript.

Build your characters yourself first, then bring the AI in. A Character.AI bot built from a few hundred words you wrote will respond better than one built from “give me a generic medieval knight.” The work of character-building is the work; the AI helps you stress-test what you have built.

Notice when the AI is teaching you bad habits. AI characters tend toward certain patterns: balanced “it’s not just X, it’s Y” constructions, em dashes everywhere, slightly stilted reflective dialogue. If your own writing starts picking these up, take a break.

Disclose when relevant. Some publications, contests, and writing communities have policies on AI assistance. Know the policy of where you are submitting and follow it. Most policies are fine with AI as a thinking partner; some are not fine with AI-generated text in the submission. The line is clearer than it sounds.

The writing has to be yours for the writing to mean anything. Tools are tools. The thinking, the choosing, the caring is what makes a story worth reading. AI helps you think faster; it does not replace having something to say.

FAQ

Can I use Character.AI to write fanfic?

Yes, and many people do. The platform is largely tolerant of fanfic use. NSFW fic is the friction point: heavily filtered. For NSFW fanfic specifically, Janitor or Crushon are better options.

Will publishers reject my book if I used AI?

Depends on the publisher and how you used it. Most publishers are fine with AI as a brainstorming or editing tool. Most are not fine with substantial AI-generated text in the manuscript. Disclosure where required, and read the contract.

Is using AI for creative writing a crutch?

Depends on how. Using it to think through problems is no more a crutch than talking to a writer friend would be. Using it to generate the prose you publish is a different question, with different consequences for your craft.

Are these apps trained on my writing?

Depends on the app. Some include user conversations in training data; some do not. The adult privacy guide covers the broader picture. For sensitive work-in-progress you do not want absorbed into a model, default to apps with explicit policies against training on user data.

What about copyright?

Complex and evolving. The current US copyright office position is that purely AI-generated text is not copyrightable; human-authored work that uses AI tools as a thinking partner is copyrightable as the author’s work. If you are writing for publication, get advice specific to your jurisdiction.

Where to start

If you have never used a companion app for writing: start with Character.AI’s free tier. Build one character from your work-in-progress, see what it does, see if the use makes sense for you.

If you are working on a long project with one central character: Kindroid is worth the $10/month for the memory.

If you are stuck on plot or structure rather than scene-level work: Pi, free.

If you write NSFW fic: Janitor for free, Crushon or Candy for paid polish.

Best AI Companion Apps in 2026 for the full mainstream ranking.

Best Adult AI Companion Apps in 2026 for NSFW-capable apps.

Find your AI companion (quiz) for a quicker decision.

If you write using one of these apps and have something we should know, write us at the contact form. The lived experience shapes how we cover this.