Is Grain available for Windows?
Grain is Mac first. The download flow offers a Windows waitlist, and the self-hostable core runs on Linux.
Docs
Install Grain
Download the free Mac app from rungrain.com, then use the CLI to sign in and create a workspace for the current folder. The app's download dialog asks for an early-access phrase and includes a request-access form.
Mac app
Download the Mac app from rungrain.com. Grain is Mac first; Windows has a waitlist, and the self-hostable core runs on Linux.
Sign in
grain loginUse the login command before creating a workspace.
Create a workspace
grain initThe init command creates a workspace for the current folder and writes agent configuration to .mcp.json for Claude Code, .codex/config.toml for Codex and .cursor/mcp.json for Cursor. Pass --no-agent-config when you do not want those files written.
Check the install
grain doctorgrain doctor prints local CLI auth and workspace link status. Pass a path to check a different folder: grain doctor path/to/project.
Updating
The Mac app updates itself and refreshes the bundled CLI with each app update. There is no separate CLI update command. grain upgrade does something else: it promotes a pushed static workspace to an app runtime, and it is covered in the CLI reference.
Frequently asked questions
Which coding agents does Grain configure?
The init command writes configuration for Claude Code, Codex and Cursor. Any CLI agent that speaks MCP can work with Grain.
Can I skip agent configuration?
Yes. Pass --no-agent-config to the init command.
How do I update the Grain CLI?
Update the Mac app; it refreshes the bundled CLI. grain upgrade is not an updater: it promotes a static workspace to an app runtime.
Keep what your agent builds
Download the free Mac app and use the coding agent plan you already have.
Free forever. No card. Bring your own agent.
Sources · facts verified 2026-09-03
- Grain product and download page · 2026-09-03