The idea in one paragraph
A WebView app is a website wearing an app coat. Instead of building screens, buttons, and databases in native Android code, the developer wraps a website in a thin native frame that displays it. Android provides the frame's engine, called WebView, as part of the system. The KhoindVN APK is a textbook example: a 13 KB frame around the live khoindvn.io.vn site.
Why developers choose wrappers
For a personal site or a small publication, a wrapper is the pragmatic choice. One codebase, the website itself, serves every visitor, and the app is simply a convenient door. There is no separate app version of the content to maintain, no duplicate publishing workflow, and updates to the site reach app users instantly.
The trade is honest: you get the site exactly as its author made it, for better and worse. Our piece on turning websites into apps walks through how these wrappers are actually built.
Why they are so small
A wrapper carries almost no content. No article text, no image libraries, no offline databases. Everything visible loads from the web at open time, which is why KhoindVN fits in 13 KB while a native news app with the same articles bundled might weigh 40 MB. Small is not a trick here; it is the architecture working as intended.
The trade-offs, plainly
Wrappers need the internet; there is no offline reading unless the site itself cached pages in your WebView. They inherit the site's design rather than following Android design conventions, and they cannot do things websites cannot do, like rich background sync. For a reading app, none of that matters much. For a music player, it would be fatal. The wrapper suits the job: quiet reading of a personal site, as we compare in app vs. browser.
Are WebView apps second-class?
Only if you judge them by the wrong standard. A wrapper is not a failed native app; it is a successful shortcut. Judged as what it is, a one-tap door to a website you like, KhoindVN is close to perfect: tiny, fast to install, and invisible in daily use. The coat fits because it was cut for exactly one wearer.