pixi is a single static binary — no Python required (unlike conda, which IS Python). Two install paths.
Curl installer (recommended): curl -fsSL https://pixi.sh/install.sh | bash. Drops the binary at ~/.pixi/bin/pixi and adds to PATH. Restart your shell.
Homebrew: brew install pixi. Slightly slower install but keeps pixi in your Brewfile.
Verify with pixi --version. Upgrade with pixi self-update (curl install) or brew upgrade pixi.