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AspenMark

A zero-dependency Markdown viewer/editor with split live preview, a custom UI, and five themes.

Downloads See features

Version 1.2.0 · Windows 10/11 · 64-bit · Free

AspenMark in split view — Markdown source on the left, live rendered preview on the right (dark theme)
Features
Only what you need — lightweight
⟷

Split live preview

Edit on the left, preview on the right. Updates instantly (150ms), smooth with Korean IME.

🎨

Five themes

Dark, light, BTS, green and blue — pick from the menu. All contrast-checked (WCAG).

🧲

Magnetic window snap

Snaps softly to screen edges, with smooth multi-monitor moves.

📐

Three view modes

Split · editor-only · preview-only, with automatic per-mode window sizing.

📋

GFM tables · code fences

Tables (with alignment), code blocks, quotes and lists — rendered by a custom engine.

🔒

Fully offline · no collection

Everything runs locally. No server calls, tracking or collection at all.

Themes
Five built-in themes
AspenMark — Dark theme
Dark
AspenMark — Light theme
Light
AspenMark — BTS theme
BTS
AspenMark — Green theme
Green
AspenMark — Blue theme
Blue
Compact mode
Dock to a slim bar

Collapse the window to a slim, always-on-top bar pinned to the top of your screen — the editor is a double-click away.

AspenMark compact-mode bar, dark theme AspenMark compact-mode bar, light theme
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Get it now

Choose the installer (recommended) or the no-install portable build.

Installer (.exe · 57MB) Portable (.zip · 56MB)
Requirements: Windows 10/11 (64-bit) · runs even without .NET installed (runtime bundled)
Changelog
Changelog
VersionNotes
1.2.0
2026-07		 AspenKit family integration — launch installed sibling apps (AspenDev, …) from the menu; compact bars of AspenKit apps tile side by side when folded; windows magnetically snap to other AspenKit windows while dragging.
1.1.1
2026-07		 Consistent view-switch sizing — split doubles the current width, editor/preview halves it, anchored to the nearer screen edge, with less flicker/lag on switch. Click the title bar to dismiss a menu; theme labels tidied (Green/Blue). Robustness: atomic document & settings writes (an interrupted save can't corrupt the file), plus maximized-restore and drag-and-drop hardening.
1.1.0
2026-07		 Markdown engine hardening — fixes for two crashes, an unsafe-link security issue, several rendering-correctness bugs and two O(n²) performance cliffs; open any text/code file with automatic Korean (CP949) encoding detection; scrollbar fix; theme cleanup (Dark/Light/BTS/Green/Blue); compact-mode and title-bar improvements.
1.0.0
2026-06		 First public release. Split live preview, custom Markdown engine (headings, emphasis, lists, quotes, code fences, GFM tables, hr), dark/light/BTS themes, magnetic snap, settings persistence, installer & portable builds.