You don’t necessarily need to install Scilab on your local machine to use it.

While installing Scilab provides full access to its features offline, you can also use Scilab on the cloud without installing anything. This is especially useful for quick testing or when you're unable to install software on your device.

Try Scilab on cloud here:
https://cloud.scilab.in/

However, for larger projects or if you need access to additional toolboxes and files, installing Scilab locally might give you better performance and flexibility.