vsbytemd.

Full Editor vs Pure Renderer

get started ↗ examples all comparisons

FIG-001

SHEET 01 / 07

FIG-002 / OVERVIEW

at a glance.

Compare ByteMD and @humanspeak/svelte-markdown: a hackable markdown editor from ByteDance versus a focused Svelte 5 renderer for app content.

FIG-003 / FEATURE MATRIX

side-by-side.

Every surface that matters, compared without spin.

feature	@humanspeak/svelte-markdown	ByteMD
Svelte 5 Native	yes	Svelte 3/4 era
TypeScript Support	yes	yes
Markdown Rendering	yes	yes
Markdown Editing	no	yes
Custom Renderers	yes	Via plugins
Token Caching	yes	no
HTML Tag Control	84 tags with allow/deny	Via sanitize schema
LLM Streaming Mode ByteMD is an editor with live preview, but its upstream docs do not describe a dedicated markdown streaming renderer mode.	writeChunk() / resetStream()	no
Streaming HTML Output ByteMD targets the editor + live-preview workflow; agent-streamed HTML output where nested blocks resolve mid-stream is not the use case.	Partial blocks reconcile when </tag> arrives	no
Plugin Ecosystem	Marked extensions	Official plugins (math, mermaid, etc.)
Math (KaTeX)	Built-in extension (markedKatex)	Via @bytemd/plugin-math
Diagrams (Mermaid)	Built-in extension (markedMermaid)	Via @bytemd/plugin-mermaid
XSS Protection	Built-in	Built-in (sanitize-html)
Framework Support	Svelte 5	Svelte, React, Vue, vanilla
Maintenance	Active	Slowed (~1.3k stars, fewer recent updates)

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
+Svelte 5 native — ByteMD is Svelte 3/4 era
+Actively maintained for latest Svelte
+Lighter bundle for rendering use cases

▢ bytemd 5

+Full markdown editor with split-pane preview
+Framework-agnostic — works in React, Vue, vanilla JS
+Official plugins for math, mermaid, syntax highlighting
+XSS-safe by default
+Established community (~1,300 GitHub stars)

FIG-005 / LIMITATIONS

where each falls short.

▣ svelte markdown 4

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

▢ bytemd 4

−Built on Svelte 3/4 — not updated for Svelte 5 runes
−Development has slowed significantly
−Overkill for display-only use cases
−Larger bundle size

FIG-006 / VERDICT

the honest call.

Choose ByteMD when you need a cross-framework markdown editor with built-in plugins. Choose @humanspeak/svelte-markdown when you want a modern, Svelte 5-native rendering component — ByteMD has not yet been updated for Svelte 5.

FIG-007 / MORE