Hey Product Hunt!

I'm Marco, and I built CreativeWriter to solve a problem that drove me crazy: every AI writing tool I tried had no memory of my story. Every single time I wanted to generate a scene, I had to manually assemble context — copy-paste character descriptions, summarize what happened before, remind the AI about plot points. For a 50-chapter novel, that's insane.

So I built an agentic AI that does the research for you.

How it works:

You define your story's world in a codex (characters, locations, factions, plot notes) and outline your narrative in beats. When you hit generate, the AI agent autonomously:

Reads your story outline and structure
Looks up which codex entries are relevant to this specific scene
Pulls in prior scenes for continuity
Writes prose that's actually consistent with your story

You watch it stream in real time. If your character got a scar in chapter 3, the agent knows about it in chapter 12. No manual context management.

That same agentic approach powers everything else:

Deep Writer mode — instead of one shot at the LLM with a stuffed system prompt, runs a small pipeline: research the story, draft the beat, analyze it against your style + cliché index, then refine. Each step has its own model slot (cheap fast model for research, premium model for refine), and you watch the step trail in real time — research focus chips, per-step elapsed timers, completion summaries. Slower per beat, dramatically more grounded in your story.
Margin cards — beats numbered down the left margin of the editor, codex entries that are actually relevant to what you're writing right now down the right. Click a beat to jump to it; click a codex card to edit it without leaving the scene. No more alt-tabbing to remember what color your antagonist's eyes are.
Character chat — the agent loads the character's full codex profile to stay in character
Scene chat — it pulls your story context to answer questions
AI rewrite — it maintains story consistency while restyling your text
Story analysis — it checks character voice and cliché patterns across your entire manuscript

What sets it apart from other AI writing tools:

The agent picks context, not you. Most tools either make you copy-paste your codex into the prompt, or stuff the entire codex into every call. CreativeWriter's agent reads your beat and decides what's actually relevant for this scene.
Deep Writer mode is a real pipeline, not a single call. Other tools run one prompt and hope. CreativeWriter's Deep Writer mode runs research, draft, analyze, and refine as separate calls with separate models — so you spend premium tokens only where they matter.
BYOK, no markup. Most AI writing tools resell API capacity as marked-up "credits." CreativeWriter is bring-your-own-key — you pay raw OpenRouter / Claude / Gemini / Ollama rates. The optional hosted tier is priced near infrastructure cost, not subscription rent.
Open source, MIT, self-hostable. Most fiction tools are closed-source SaaS. CreativeWriter runs on your own Docker host if you want it to. Your stories never leave hardware you control.
Multi-provider. OpenRouter (200+ models), Claude, Gemini, Ollama, OpenAI-compatible. Not locked into one vendor's pricing or one model's quirks.

The part I'm most proud of: you can write a beat description as simple as "Elena discovers the hidden letter in the library", and the agent figures out which Elena, which library, what she already knows, and what happened in prior scenes — then writes a full prose passage that fits perfectly into your story. No prompt engineering required.

There's a 7-day free trial, no credit card. And if you want full control, the self-hosted version is MIT-licensed and runs with Docker.

Would love your feedback — especially curious what other agentic features would be useful for fiction writers.