Ion One Dark Theme

March 7, 2026 ยท View on GitHub

Ion One Dark Theme is a One Dark-inspired dark theme for Visual Studio Code and Cursor, built for readability, consistent syntax coloring, and comfortable long coding sessions.

If you are looking for a clean One Dark theme for VS Code and Cursor with practical contrast tuning, this extension is designed for that exact workflow.

Why Ion One Dark Theme

  • One Dark-inspired color system adapted for modern editor and workbench surfaces.
  • Balanced contrast for daily coding, reviewing diffs, and navigating large projects.
  • Cursor-compatible through the standard VS Code extension ecosystem.
  • Clear token differentiation without overly saturated or distracting highlights.

Features

  • Cohesive dark UI styling for editor + workbench surfaces.
  • Readable syntax highlighting across common languages and file types.
  • Reliable visual hierarchy in sidebars, tabs, command surfaces, and terminal views.
  • Comfortable theme profile for long development sessions.

Install

Visual Studio Code

  1. Open Extensions (Cmd/Ctrl+Shift+X)
  2. Search for Ion One Dark Theme
  3. Click Install

Cursor IDE

  1. Open Extensions (Cmd/Ctrl+Shift+X)
  2. Search for Ion One Dark Theme
  3. Install and activate the theme

Manual .vsix packaging

npm install
npm run package
code --install-extension ion-one-dark-<version>.vsix
cursor --install-extension ion-one-dark-<version>.vsix

Activate the Theme

  1. Open Command Palette (Cmd/Ctrl+Shift+P)
  2. Run Preferences: Color Theme
  3. Select Ion One Dark Theme

These optional settings pair well with the theme for readability:

{
  "editor.fontFamily": "JetBrains Mono, Menlo, Monaco, 'Courier New', monospace",
  "editor.fontLigatures": true,
  "editor.minimap.enabled": false
}

Theme color customization docs: https://code.visualstudio.com/docs/getstarted/theme-color-reference

Compatibility

  • VS Code engine target: ^1.60.0
  • Extension category: Themes
  • Theme kind: vs-dark
  • Cursor support: yes (via VS Code extension compatibility)

Issues and Feedback

If you find token or UI inconsistencies, open an issue and include:

  • language or file type
  • minimal reproducible snippet
  • screenshot of the affected UI/token color

Issue tracker: https://github.com/brunocechet/ion-one-dark/issues

Acknowledgments

Ion One Dark Theme is inspired by:

Changelog

See: CHANGELOG.md

License

Mozilla Public License 2.0 (MPL-2.0). See: LICENSE