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Introduction to Time Capsule

You’re not visiting a website. You just logged into a Unix workstation.
Time Capsule is a faithful recreation of the Unix Common Desktop Environment (CDE) - the iconic desktop that powered workstations in the 1990s. Built as a Progressive Web App, it runs entirely in your browser with authentic visuals, behavior, and functionality.

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What is Time Capsule?

There was a time when desktops were heavy, monitors were beige, and opening a terminal felt powerful. Time Capsule brings that experience back - not as screenshots or mockups, but as a real, interactive desktop environment. This is a complete recreation of the Unix CDE experience using modern web technologies. Every pixel, every color palette, every backdrop is authentic to the original system that ran on Sun Solaris, HP-UX, and IBM AIX workstations.

Try it live

Experience Time Capsule in action

Quickstart guide

Get started in 5 minutes

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Key features

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Authentic theming system

Time Capsule includes 76 authentic Motif color palettes and 168 original XPM backdrops from the 1990s. Every palette transforms your entire desktop - from window borders to buttons to the front panel. Popular palettes:
  • Platinum - Classic gray (the default CDE look)
  • Broica - Warm browns and earth tones
  • Alpine - Cool blues for a crisp appearance
  • Midnight - Dark theme for low-light environments
  • Coalmine - Very dark with high contrast
Original backdrops:
  • CircuitBoards - Dithered tech patterns
  • BrokenIce - Crystalline textures
  • Afternoon - Warm geometric designs
  • Carpet - Textile-inspired patterns
  • Arabesca - Ornate decorative motifs
You can customize your theme and share it as a link. Your complete setup - colors, backdrop, fonts - can be exported and loaded by anyone instantly.
Real Emacs keybindings including C-x C-s (save), M-x (execute command), C-k (kill line), and C-y (yank). Features an interactive minibuffer, authentic GNU splash screen, and full text editing capabilities. Edit files in your virtual filesystem with the power of Emacs.
22 interactive Unix/Linux lessons that teach you by doing. Learn essential commands from ls to pipes, with instant feedback. Switch between tutorial mode (guided lessons) and free mode (full bash-like environment) with tab completion.
A complete in-browser filesystem with O(1) path resolution. Create files, make directories, copy, move, and delete with full Unix-like path handling. All data persists using IndexedDB. Navigate with the File Manager or command line.
Experience web browsing from 1994. Authentic interface with retro compatibility for exploring internal documentation and curated 90s-style content. Complete with navigation buttons, address bar, and bookmarks.
28 essential Unix manual pages with authentic formatting and clickable examples. Browse documentation for commands like ls, grep, find, chmod, and more. Learn Unix the traditional way.

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System features

Boot sequence

Watch the system initialize with authentic Debian boot messages, just like a real Unix workstation

4 virtual workspaces

Organize your work across four separate desktops. Switch with Ctrl+Alt+1-4

Window management

Drag, resize, minimize, and maximize windows with smooth interactions and CDE-style controls

Keyboard shortcuts

20+ shortcuts for power users. Navigate and control everything without touching the mouse

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Progressive Web App

Time Capsule isn’t just a website - it’s a full Progressive Web App that can be installed on any device:
  • Offline access - Works without internet after initial load
  • Native experience - Runs in its own window without browser UI
  • Desktop integration - Appears in your app launcher and taskbar
  • Automatic updates - Always stays current with new features
  • Cross-platform - Desktop, tablet, and mobile with touch gestures
Click the “Install PWA” icon on the desktop to install Time Capsule as a native app. See the PWA installation guide for details.

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Why Time Capsule exists

The goal wasn’t pixel perfection - it was experience authenticity. This project preserves computing history in an interactive, accessible format. You don’t need to find old hardware or install virtualization software. Just open a browser. Time Capsule is built for:
  • Nostalgia enthusiasts who remember CDE workstations
  • Unix learners who want hands-on command line practice
  • Design historians studying 1990s interface design
  • Curious developers interested in retro computing

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Technical foundation

Time Capsule is built with modern web technologies: 
// Built on Astro's islands architecture
// Each application hydrates on demand
import { defineConfig } from 'astro/config';

export default defineConfig({
  // Static HTML shell with interactive islands
  integrations: [/* TypeScript, CSS, IndexedDB */]
});
Architecture highlights:
  • Astro for static HTML with interactive islands
  • TypeScript for type-safe application logic
  • IndexedDB for persistent storage and virtual filesystem
  • Web Workers for XPM image parsing and background tasks
  • Service Workers for offline caching and PWA capabilities
  • Web Audio API for authentic system beeps
The source code demonstrates event-driven communication, lazy loading, virtual scrolling for performance, and progressive enhancement throughout.

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Works everywhere

Desktop feels native. Mobile adapts with touch gestures. Keyboard shortcuts still work. The experience behaves like a real system - not a responsive layout pretending to be one.
Time Capsule is fully responsive. On mobile, use touch gestures to drag windows, tap to click, and swipe to navigate. On desktop, use keyboard shortcuts for maximum efficiency.

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Open source

Time Capsule is open source and welcomes contributions:
  • Add new color palettes or backdrops
  • Improve accessibility features
  • Fix bugs and optimize performance
  • Create new applications
  • Enhance documentation
The project is actively maintained on GitHub with a friendly community in discussions.

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Next steps

Quickstart

Launch your first application in 5 minutes

PWA installation

Install as a native app on any device
Ready to experience 1990s Unix computing? Try Time Capsule now or continue with the quickstart guide to learn the essential features.