01
Source fidelity
02
SDK first
03
PWA editor
04
GFM where it counts
Description
A ProseMirror-based Markdown editor SDK (@21stware/handymd) with conceal/reveal source fidelity: no separate rich-text model — semantics live in decorations. Ships as an npm package plus a PWA editor and docs site.
Bear-style source-fidelity Markdown editor SDK — the document is the Markdown.
What's Included
Source fidelity
The document is Markdown. Conceal/reveal markers by caret — no parallel rich-text model to drift.
SDK first
npm @21stware/handymd with load/save, autosave, Shiki, Mermaid, and a clear phase API.
PWA editor
Installable .md opener at the handymd app URL — same engine as the SDK.
GFM where it counts
Tables, task lists, blockquotes, and nested emphasis with predictable keyboard behavior.
Information
- Seller
- 21stware
- Category
- Content
- Compatibility
- Suite membership
- Minimum tier
- Free+
- Audience
- Builders who need a Markdown editor that stays faithful to source — for apps, notes, or agent-authored docs.
- Website
- 21stware.github.io/handymd/
- Source
- GitHub
Membership
Unlocks with your 21stware pass
handymd is in the suite from Free upward. Free is BYOK; paid plans include agent battery and more.
