Charon

Keep what matters.

Capture your ideas, keep them locally as Markdown, and copy them when you need context for an AI agent.

Download Charon

v0.3.1 is available in early access for macOS, Windows, and Linux.

From selection to prompt.

  1. Capture

    Select text in any app and press Shift twice, or open the composer and type.

  2. Add

    Add tags, a file, a screenshot, or a sketch if it helps.

  3. Copy

    Choose Copy as Markdown and paste it into your agent.

Double Shift works on macOS and is experimental on Windows and Linux X11.

What Copy as Markdown would put on your clipboard
Ship the beta on Friday

**Tags:** ` release `
Version
0.3.1, early access
Runs on
macOS on Apple Silicon, Windows, Linux
Price
Free, MIT licensed

Charon is local-only. There is no account, no sync, no analytics, and no telemetry, and nothing you keep leaves your computer. It touches the clipboard only after a gesture of yours, and its one network request, the update check, stays off until you turn it on.

Captures

Selected text
double Shift
Typed notes
composer shortcut
Files
drop or paste
Screenshots
paste
Sketches
shapes and labels

Keeps

Notes
Markdown files
Tags
up to 16 a note
Attachments
up to 20 a note
Updates
off by default
Account
none