vsmilkdown.

Plugin-Driven Editor vs Focused Renderer

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FIG-001

SHEET 01 / 07

FIG-002 / OVERVIEW

at a glance.

Compare Milkdown and @humanspeak/svelte-markdown: a ProseMirror markdown editor versus a lightweight Svelte 5 component for rendering markdown content.

FIG-003 / FEATURE MATRIX

side-by-side.

Every surface that matters, compared without spin.

feature	@humanspeak/svelte-markdown	Milkdown
Svelte 5 Native	yes	Via recipe/adapter
TypeScript Support	yes	yes
Markdown Rendering	yes	yes
WYSIWYG Editing	no	yes
Bundle Size	Lightweight (~15KB)	Heavy (~150KB+)
Custom Renderers	yes	Via ProseMirror nodes
Token Caching	yes	no
LLM Streaming Mode Milkdown updates live as an editor, but it does not document a dedicated markdown streaming renderer mode.	writeChunk() / resetStream()	no
Streaming HTML Output Milkdown is a ProseMirror-based editor — not designed to render agent-streamed HTML where blocks resolve mid-stream.	Partial blocks reconcile when </tag> arrives	no
HTML Tag Control	84 tags with allow/deny	Via ProseMirror schema
Math (KaTeX)	Built-in extension (markedKatex)	Via @milkdown/plugin-math
Diagrams (Mermaid)	Built-in extension (markedMermaid)	Via @milkdown/plugin-diagram
Collaborative Editing	no	Via Y.js plugin
Slash Commands	no	yes
Setup Complexity	One component	Plugin assembly required
Theming	Via Svelte components	Headless (bring your own CSS)

FIG-004 / STRENGTHS

where each shines.

▣ svelte markdown 12

+Svelte 5 runes-native — built for runes, not retrofitted
+TypeScript-first with full type safety
+Built-in token caching (50-200x faster re-renders on repeated content)
+LLM streaming with imperative writeChunk() / resetStream() API
+23 markdown renderers + 84 HTML tag renderers — every override is a Svelte snippet
+First-class extensions: KaTeX math, Mermaid diagrams, GitHub alerts, footnotes
+Built-in XSS protection — protocol allowlist, event-handler stripping, attribute sanitization
+Allow/deny utilities (allowHtmlOnly, excludeRenderersOnly, etc.) for fine-grained control
+Drop-in component — works anywhere in your Svelte app
+Dramatically smaller bundle size
+Zero configuration for rendering
+Pure rendering — no editor overhead

▢ milkdown 5

+Full WYSIWYG markdown editing experience
+Plugin-driven architecture (~10,700 GitHub stars)
+Collaborative editing via Y.js
+Slash commands, toolbar, and more
+Headless — fully customizable appearance

FIG-005 / LIMITATIONS

where each falls short.

▣ svelte markdown 5

−Smaller community (newer project)
−Runtime-only (no build-time optimization)
−No editing capabilities
−No collaborative features
−No built-in code syntax highlighting (use a marked extension)

▢ milkdown 4

−Heavy bundle for display-only use cases
−Svelte support is via adapter, not first-party
−Requires significant configuration and plugin wiring
−ProseMirror learning curve

FIG-006 / VERDICT

the honest call.

Choose Milkdown when you need a beautiful, interactive markdown editing experience with collaborative features. Choose @humanspeak/svelte-markdown when you just need to display markdown — it is 10x lighter and requires zero configuration.

FIG-007 / MORE