# How to Vibe Code Your Own Sudowrite (and Stop Paying for It)

> The AI writing partner and long-form workspace for novelists and screenwriters

- Site: https://sudowrite.com
- Category: AI Writing SaaS
- Verdict: **Solid side project** (68/100 vibecodeable)
- Estimated effort: 2-3 weeks part-time

## Verdict

You can build a functional personal clone of Sudowrite's core writing loop in a couple of weeks, but maintaining rich long-form context and custom fiction prompt tuning requires deliberate engineering.

Replicating the CRUD skeleton, project database, and a rich text editor frontend with the Vercel AI SDK is straightforward using an AI coding agent. Where you will hit friction is context management: feeding a 60,000-word manuscript plus a character and plot bible into an LLM call without blowing past token limits or context degradation requires building an aggressive RAG or chunking strategy. Furthermore, getting the prompt chains right for 'Expand', 'Rewrite', and 'Write' so they sound like a novelist rather than a corporate chatbot takes substantial iteration.

### What you can't replicate

- Sudowrite's proprietary fine-tuned fiction models (Muse)
- Their exact prompt engineering heuristics built over years of author feedback
- The organic community and word-of-mouth adoption among professional novelists

## What it does

Sudowrite is an AI-powered creative writing platform designed to help fiction writers generate ideas, outline plots, expand descriptions, rewrite scenes, and maintain a consistent story bible.

### Core features

- Story Bible (characters, world-building, outline storage)
- Long-form rich text editor with sidebar and chapters
- AI Autocomplete ("Write" feature with multi-option suggestions)
- Scene expansion ("Expand" pacing adjuster)
- Multi-style revision buddy ("Rewrite")
- Automated critique and feedback generator
- Interactive brainstorming canvas & name generator
- Chat assistant with story context awareness

## The business

### Pricing

- Hobby & Student: $10/mo — Perfect for people who write for fun or school
- Professional: $22/mo — Good for longer works, like a novel or screenplay
- Max: $44/mo — For authors who publish multiple times a year

### Funding

$2M raised.
- Seed
Investors: Sequoia Capital, Human Ventures

Founded 2021.
Team size: 6-15.

## The hard parts

- Maintaining long-form context across tens of thousands of words without hitting token limits or losing character/plot consistency
- Orchestrating hybrid model pipelines (fine-tuned fiction models + frontier reasoning models)
- Building a smooth rich-text editor with inline AI suggestion popups and side-by-side variation cards
- Assembling and injecting structured Story Bible metadata into context windows dynamically

## How to vibe code Sudowrite

### Prerequisites

- Node.js (free): Required for running the Next.js development environment.
- GitHub (free): Repository hosting and continuous deployment connection.
- Anthropic API Key (pay-as-you-go): Provides the underlying Claude models for long-form prose generation and reasoning.

### Recommended AI tools

- Cursor: Provides an ideal environment for iterative frontend polish of the rich text editor and sidebar components.
- Claude Code: Handles complex multi-file scaffolding, database schema migrations, and API route orchestration.

### Stack

- Frontend: Next.js (App Router, Tailwind CSS, TipTap rich text editor)
- Backend: Next.js Server Actions & API Routes
- Database: Turso (SQLite at the edge for per-user project storage)
- Auth: better-auth
- Payments: none
- Other: Vercel AI SDK, Anthropic API, OpenAI API

### Hosting

- Vercel (Hosting the Next.js frontend and serverless API endpoints): $0/mo (Hobby tier)
- Turso (Serverless SQLite database for manuscripts, chapters, and story bibles): $0/mo (Free tier)

### Build guide

1. **Project Scaffolding & Database Schema** — Initialize the Next.js project with Tailwind CSS, configure better-auth, and set up Turso tables for projects, chapters, and story bible entries.

```
Scaffold a new Next.js App Router project in TypeScript using Tailwind CSS. Set up better-auth with email/password authentication connected to a Turso (libSQL) database. Create database migrations and schema models for: 'projects' (id, user_id, title, genre, synopsis, created_at), 'chapters' (id, project_id, title, content, order_index, word_count), and 'story_bibles' (id, project_id, category, name, description). Provide clean database client configuration and helper utilities.
```

2. **Rich Text Editor & Project Dashboard** — Build a distraction-free writing interface featuring a chapter sidebar, project selector, and a TipTap-based rich text editor.

```
Create a dashboard view in Next.js that lists a user's writing projects and allows creating new ones. Build a dedicated project workspace page featuring a collapsible left sidebar for chapters and a story bible manager, and a main central writing area using a TipTap rich text editor wrapper. Implement auto-saving of chapter content with debounce, word count calculation, and clean dark/light theme styling suitable for long-form writing.
```

3. **Story Bible & Context Injection** — Implement the Story Bible management UI and build backend utilities to compile character and world-building context for AI prompts.

```
Implement the Story Bible feature where authors can add characters, locations, plot notes, and rules. Build a server-side utility function that queries all active story bible entries for a project and formats them into a structured markdown context block that can be prepended to AI generation requests. Add a dedicated UI tab in the workspace to manage these bible entries easily.
```

4. **AI 'Write' Autocomplete & Expand Features** — Integrate the Vercel AI SDK to power inline continuation ('Write') and pacing expansion ('Expand') using Claude Sonnet.

```
Using the Vercel AI SDK, create an API route '/api/ai/write' that takes the current chapter context, cursor position, and project story bible. Construct a specialized fiction-writing system prompt instructing the model to analyze tone and style and suggest the next 200-300 words. On the frontend, add a 'Write' keyboard shortcut (or button) that invokes this endpoint, streams the response, and lets the user accept, discard, or cycle through multiple variation options.
```

5. **AI 'Rewrite' & Critique Feedback Engine** — Build tools for rewriting selected text blocks with directional prompts and generating structural critique reports.

```
Build an AI rewrite and feedback component. Create an API route '/api/ai/rewrite' that accepts selected text and a user instruction (e.g., 'Make it more suspenseful', 'Show don't tell', 'Rewrite dialogue'), applying it while preserving voice. Also build a '/api/ai/feedback' route that reads an entire chapter, runs an evaluation against pacing, character motivation, and conflict, and returns five actionable feedback points rendered in a side panel.
```

6. **Polish, Error Boundaries & Deployment** — Add Sentry error tracking, polish keyboard navigation, and deploy the application to Vercel and Turso.

```
Perform a comprehensive code review and polish pass across the codebase. Add loading skeletons for chapter switches, robust error handling for AI stream failures, and environment variable validation. Ensure all database queries are secure and scoped strictly to the authenticated user. Write deployment instructions for pushing to GitHub, configuring Vercel environment variables, and connecting Turso.
```

### Cost vs paying

**Starting costs (one-time):**

- AI Coding Assistant (Cursor / Claude Pro): $20 one-time
- Anthropic API starting credits: $10 one-time
- Total: ~$30 one-time

**Ongoing costs (monthly):**

- Vercel & Turso Hosting: $0/mo
- Anthropic API usage (personal novel writing): ~$5-15/mo
- Total: ~$10/mo

- Paying for the SaaS instead: $22/mo (Professional Plan)
- Build time: 25-35 hours
- AI tool credits: $20 (Cursor Pro or Claude Code)
- Break-even: 1 month of active writing

## Sources

- [Sudowrite Official Website & Marketing Pages](https://sudowrite.com)