# Copperas

> A local-first writing application for novelists with purpose-built AI editorial.

Copperas is a desktop writing application for novelists. Your manuscript stays on your computer as a plain Markdown file — not in a cloud database. The AI knows your project, reads your chapters, and holds your prose to your own standards every session. Free to download. AI features require a subscription.

## What makes it different

- **Local-first**: Your manuscript is a file on your hard drive. Open it in any text editor. Keep writing even if Copperas disappeared tomorrow.
- **AI with memory**: Every session loads your characters, timeline, reference files, and prior session notes automatically — no re-explaining, no blank slate.
- **Editorial, not generative**: The AI reads what you wrote, tells you what it found, and waits for your decision. Nothing touches your manuscript until you click Apply.
- **Powered by the Longform Prose Engine**: Purpose-built compute infrastructure that selects the right model for the task, assembles the right context, and applies the right editorial lens.

## AI editorial capabilities

- **AI Assistant**: Understands your project — characters, plot threads, chapter structure, style contract
- **Editing Assistant**: Quick Read, Close Read, and Deep Read (three depths of editorial attention)
- **Drafting Assistant**: Drafts, revises, and expands prose on instruction, in your voice
- **Beta Readers**: Three independent AI readers with distinct lenses, responding without seeing each other's reactions
- **Agent Assessment**: Honest professional evaluation — reads like a real agent's notes
- **Pacing & Intensity**: Maps emotional and narrative momentum from opening to final page
- **Sensitivity Read**: Flags stereotypes, harmful tropes, and representation issues across nine categories
- **Session Memory**: Facts from every working session harvested and fed back automatically

## The writing environment (free)

- Full WYSIWYG Markdown editor with typewriter mode and focus mode
- Chapter navigator and version timeline (automatic Git snapshots)
- DOCX import and export
- Six handcrafted themes
- Voice input
- 25 pre-built genre templates
- Works fully offline — no account required

## Pricing

- **Local Mode**: Free forever, no account required
- **Basic**: $18/month — 10,000 credits, all AI features (approx. 12–15 chapter cycles/month)
- **Extended**: $30/month — 28,000 credits, adds Deep Read
- **Best Seller**: $42/month — 48,000 credits, maximum editorial depth
- All prices in USD. Credits map directly to actual AI cost.

## Platforms

- macOS (Apple Silicon and Intel)
- Windows (coming soon)
- App available in English and Spanish. French and German coming soon.

## Key pages

- [Home](https://copperas.io/): Full product description, features, and pricing
- [Download](https://copperas.io/download): Download page for macOS
- [Privacy Policy](https://copperas.io/privacy): Privacy policy
- [Terms of Service](https://copperas.io/terms): Terms of service