The website can be installed as an app. An icon will appear on your desktop or phone screen, and the catalog will open in a separate window without the address bar or tabs. Nothing is downloaded or launched: it's the same website; the browser simply saves it as an app.
Yes. The app is a website saved by the browser. There are no .exe or .apk files, nothing is installed on the system, and the app has no access to files on the computer or phone.
Less than a megabyte: the browser stores only an icon and a few settings.
On a computer: Open the app, click the "⋮" menu in the window title, and select "Delete." On Android and iPhone: Long-press the icon and select "Delete."
Firefox and browsers inside Telegram or VK don't support embedding websites as apps. Open the website in Chrome, Edge, Yandex Browser, or Safari on iPhone.
On computers and Android, the login is shared with the browser. On iPhone, the app stores the login separately, so you only need to log in once.
The catalog and downloads require internet access. Without internet access, the app will display a clear "No connection" page instead of a browser error.