Copyboard

A cross-platform system-tray app that keeps a live, scrollable history of everything you copy — text, URLs, paths, images, JSON, Markdown, shell commands — so you can glance back and re-copy anything, not just the last item.

Features

Automatic capture
Every clipboard change is recorded in the background. The app runs silently in the system tray; there is nothing to configure before it starts working.

Smart content classification
Each clipping is automatically classified so you can tell what you're looking at at a glance:

Kind	Detected when
URL	http://, https://, ftp://, ftps:// with a valid host
Path	Windows drive (C:\), UNC (\\server\share), POSIX absolute (/foo), or home-relative (~/…)
JSON	Parses as a valid JSON object {} or array []
Markdown	Contains headings, fenced code blocks, blockquotes, inline links, bold text, or two or more list items
Command	First word is a known CLI tool (git, docker, kubectl, npm, uv, ssh, curl, …) or line starts with $, >, #, PS
Image	Bitmap copied from any app; stored in a temp file and shown as a thumbnail
Text	Everything else

Viewer window
A scrollable list (newest first) with a timestamp and preview for each item. Images render as 160 × 90 thumbnails. Each row has:

• Copy — puts the item back on the system clipboard
• Delete — removes it from history immediately
• Drag — drag any item directly into another app (text, URLs, paths, or image files)

The item currently on the system clipboard has a simple solid outline. The outline follows new copies, row re-copy actions, and stack-paste advancement, and disappears when the clipboard is clear.

Global hotkey
Press Ctrl+Shift+H (configurable) from any application to show or raise the viewer. Press again while the viewer is in the foreground to hide it.

Stack paste mode (LIFO)

Enable Stack paste: On/Off in the viewer or Stack paste mode (LIFO) in the tray menu to paste through history newest-first. Both controls stay synchronized. Copyboard preloads the newest clipping; after each normal Ctrl+V (Windows/Linux) or Cmd+V (macOS), that clipping is removed from history and the next-newest clipping is loaded. The final paste clears the clipboard. Turning the mode off leaves the current clipboard and remaining history untouched.

System-tray icon
Click the tray icon to toggle the viewer. Right-click for the menu:

• Show / hide viewer
• Stack paste mode (LIFO)
• Toggle light / dark theme
• Edit config… (opens config.json in your default editor)
• Quit Copyboard

Live theme toggle
Switch themes from the tray menu — no restart needed. Colors use flat, neutral boxes without gradients; dark is the default.

Retention policy
Both limits apply together: the history keeps at most max_items clippings and drops anything older than max_age_minutes. Pruning runs every second in the background.

No echo duplicates
When you re-copy a clipping, the resulting clipboard change is suppressed so it doesn't create a new duplicate entry.

Detaches from the terminal
Launching uv run copyboard immediately returns your shell prompt; the app continues running in the background.

Install & run

Requires uv and Python 3.10+.

uv sync            # create .venv and install dependencies
uv run copyboard   # launch the tray app (detaches from terminal automatically)

Configuration

Settings load from config.json at the repo root. Missing or partial files fall back to defaults.

{
  "retention": {
    "max_items": 30,
    "max_age_minutes": 20
  },
  "hotkey": {
    "toggle_viewer_hotkey": "ctrl+shift+h"
  },
  "theme": "dark"
}

Setting	Default	Description
retention.max_items	30	Maximum number of clippings to keep
retention.max_age_minutes	20	Drop clippings older than this many minutes
hotkey.toggle_viewer_hotkey	ctrl+shift+h	Global show/hide hotkey
theme	dark	dark, light, or system (follow the OS)

You can open the config file directly from the tray menu via Edit config…

Platform notes

Platform	Notes
Linux	The global hotkey requires X11. On native Wayland, the hotkey won't bind, but the tray icon still works.
macOS	pynput needs Accessibility permission (System Settings → Privacy → Accessibility). Without it the hotkey is skipped, but the app runs normally.
Windows	Works out of the box.

If the hotkey fails to bind, the app still runs — use the tray icon to open the viewer.

Development

Stack paste advances only for keyboard paste shortcuts. Context-menu paste, middle-click paste, and mouse buttons mapped to Paste are not observed. Its keyboard listener has the same X11 requirement on Linux and Accessibility-permission requirement on macOS as the viewer hotkey.

uv run ruff check .     # lint
uv run ruff format .    # format
uv run mypy .           # type-check (src + tests, disallow_untyped_defs)
uv run pytest           # run the test suite

Docs: SPEC.md (scope) · ARCHITECTURE.md (design) · TASKS.md (progress) · PLAN.md (phased plan)