What is it?
30 Second Demo
The following shows using rtx to install different versions
of node.
Note that calling which node
gives us a real path to node, not a shim.

Quickstart
Install rtx on macOS (other methods here):
$ curl https://rtx.jdx.dev/install.sh | sh
$ ~/.local/share/rtx/bin/rtx --version
rtx 2024.0.0
Hook rtx into your shell (pick the right one for your shell):
# note this assumes rtx is located at ~/.local/share/rtx/bin/rtx
# which is what install.sh does by default
echo 'eval "$(~/.local/share/rtx/bin/rtx activate bash)"' >> ~/.bashrc
echo 'eval "$(~/.local/share/rtx/bin/rtx activate zsh)"' >> ~/.zshrc
echo '~/.local/share/rtx/bin/rtx activate fish | source' >> ~/.config/fish/config.fish
Install a runtime and set it as the global default:
$ rtx use --global node@20
$ node -v
v20.0.0
Full Documentation
See rtx.jdx.dev.