Local-first publishing prep for technical writers

StackDraft

Turn Markdown, Mermaid diagrams, code, references, and tables into Substack-safe title and body copy.

Open StackDraft

Draft stays in your browser

Mermaid diagrams become static images

Tables paste as readable images

References stay references, not Substack footnotes

Title and body copy separately

Markdown

# Claude Code agent loop

```mermaid
flowchart LR
  Dev[Developer] --> Model[OpenAI / Claude]
  Model --> Tools[Tests and files]
  Tools --> Review[Human review]
```

| Step | Agent does | Human checks |
| --- | --- | --- |
| Plan | Proposes edits | Scope and risk |
| Patch | Changes files | Diff quality |

Substack copy

TitleClaude Code agent loop

BodyRich text without H1

TablesConverted to image

Question

Agent

Review

Plan

Diff

Tests

DeveloperLLM agentReview

Paste

Markdown from Obsidian, Cursor, GitHub, or local files

Prepare

Render diagrams, tables, code, math, and references

Copy

Send title and body to Substack as separate clipboard actions

Diagrams survive email

Mermaid becomes downloadable static assets instead of unsupported live diagrams.

Tables stop collapsing

Substack flattens pasted tables, so StackDraft copies them as readable images.

No publishing automation

Prepare content locally. No login, no draft creation, no private Substack API.