The honest answer first
Yes, the KhoindVN APK file served on this site is safe to install, with the same caveat that applies to every app installed outside the Play Store: safety depends on which file you install, not just which app. The file on our download page is scanned and installed on real test phones before the button goes live. A same-named file from a random mirror is not the file we tested.
With that said, here is the evidence, piece by piece, so you do not have to take our word for it.
Exhibit A: the size
The APK is about 13 KB. Malicious payloads need room to hide: exfiltration code, secondary downloads, obfuscated libraries. Thirteen kilobytes barely fits the app icon and the wrapper code. Size alone proves nothing, but it sharply limits what could be hiding.
Exhibit B: the permission list
KhoindVN v1.0 requests exactly one permission: internet access. It does not ask for your contacts, location, camera, microphone, storage, or SMS. A wrapper that only displays a website has no legitimate use for any of those, and it asks for none of them. When an app's permission list matches its job description this precisely, that is a good sign.
Compare that with the average free utility, which often requests a dozen permissions for features you never asked for. The short list here is the point.
Exhibit C: no trackers, no accounts
The app ships with no analytics SDKs and no ad SDKs, and there is no account system to leak credentials through, because there is nothing to log into. The only network traffic is your phone loading khoindvn.io.vn, the same traffic your browser would generate visiting the site directly.
Exhibit D: tested on real phones
Before publishing, we install the file on real Android phones, confirm the package name (io.khoindvn.app) and version, and use the app for days watching for odd behavior: background activity, battery drain, unexpected prompts. The full method is on our How We Review page. KhoindVN v1.0 passed on three handsets without a single surprise.
Want the broader playbook for judging any APK? Read how to sideload APKs safely before your next install from anywhere.