Edit AI-generated Markdown locally

AI assistants are fluent in Markdown and sloppy with facts. ChatGPT, Claude, Codex, and other agents all emit plans, docs, and runbooks as Markdown — structurally fine, approximately right. Typehall is the quiet local workbench for that output: paste or import the Markdown into a note, read it rendered, correct the details, keep the fixed version, and export it again. The agent writes elsewhere; Typehall renders and keeps here, in your browser. There is no account, and note content stays in your browser.

The workflow, concretely

• Ask the assistant for Markdown — a plan, a design doc, a runbook, a README draft.
• Paste the result into a Typehall Markdown note, or save it as .md and import it.
• Switch to Preview: code gets highlighting, mermaid fences draw, $…$ math typesets, tables and checklists render.
• Fix what the agent got wrong while the rendered view is in front of you.
• Keep the corrected note locally, include it in backups, export it as .md, .html, or PDF.

What a technical draft looks like here

A typical AI-generated plan renders end to end — the code fence gets highlighted, the rollout diagram draws, the formula typesets, the checklist stays tickable:

## Rollout

- [ ] Review the generated plan
- [ ] Verify the migration SQL

```sql
SELECT count(*) FROM notes WHERE trashed_at IS NULL;
```

```mermaid
flowchart TD
  A[Draft] --> B[Review]
  B --> C[Ship]
```

Expected cost $200 stays literal; real math $\sigma^2$ renders.

Local-first, so the draft is actually yours

• No account, no login, no subscription.
• Notes live in your browser's on-device database — the pasted draft never leaves the device.
• Works offline after the first visit caches the app, including rendering.
• Every edit autosaves; history, backup, and export all work on the pasted content like any other note.

Real limits

• No cloud sync: a draft pasted here does not appear on your other devices by itself.
• No collaboration: no shared notes, comments, or multi-user editing.
• No server recovery: a wiped browser with no backup means the draft is gone — back it up.

New to the rendering model? Start with Markdown notepad, then go deeper on Mermaid diagrams, math, and offline use. The trade-offs of keeping everything on-device are on Local-first notes.

Questions

Open the notepad and paste your first AI-generated draft into a Markdown note.