I'm not sure if this is the "apt page" they're referring to, but there's https://packages.ubuntu.com/ https://packages.ubuntu.com/ for Ubuntu. It's helpful for

I'm not sure if this is the "apt page" they're referring to, but there's https://packages.ubuntu.com/ https://packages.ubuntu.com/ for Ubuntu. It's helpful for searching package versions across releases, especially if I don't have an Ubuntu server handy. Other distributions have similar pages too, I believe.