Show HN: OpenMarkdown – A Markdown editor you and your agent co-edit

19 hours ago

OpenMarkdown is a local-first, feather-light, and fast Markdown editor built for users and their agents.
It uses a native Rust core, ensuring quick loading times and native performance.
The editor is AI-free; instead, it runs on the user's existing agent, providing direct integration.
Files are stored as plain .md files on the user's disk, avoiding databases and lock-in for persistence and portability.
Agents can interact with files as a wiki, opening the correct file and navigating to specific spots upon user queries.
Features include agent-assisted highlighting and reworking of selected text, saved directly to the disk.
Vendor options with varying speeds and SSO support are available at different monthly prices.
Keyboard shortcuts like Ctrl+G and Cmd+P enhance control, allowing prompt access and file navigation without menus.
Three editing modes (live preview, plain source, clean reading) are cycled with one key, with visible, syntax-colored markers.
The editor supports collaborative planning with agents, as shown in an example of drafting an auth revamp plan.
It ensures file integrity by not reformatting text, provides safe defaults like moving deleted files to Trash, and avoids accounts or cloud telemetry.
The UI is trilingual (Chinese, Japanese, English), with a CLI tool for terminal file opening, and standard Mac shortcuts are supported.

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