You don't need a separate Sitebuilder app to build your website on a mobile device. When you need to make a change on the go, quickly put together a fully working website, or add a new page background to your existing website, all you need to have is a mobile device that has access to the internet.
You can add or remove blocks, edit the content, upload images right from your smartphone or a tablet. You can edit, duplicate, or delete any page element simply by tapping them and choosing the necessary option from the menu that pops up.
To learn more about site editing on mobile, please visit this tutorial.