Does HackerRank Detect Virtual Machines?
2026-09-18
Some candidates take tests on a work laptop, a Linux box, or inside a virtual machine for ordinary reasons. Then they read a forum post and start worrying that HackerRank will flag the setup.
Here is the straight answer.
Only in one mode. HackerRank documents virtual machine blocking for Desktop App Mode, where the app "Prevents the test from running on a virtual machine." For regular browser based tests, HackerRank does not say publicly whether it detects virtual machines.
Where virtual machines are blocked
Desktop App Mode is a separate application candidates install, available for Windows and macOS. HackerRank lists these controls for it:
- Prevents candidates from sharing remote access to their systems
- Prevents the test from running on a virtual machine
- Blocks the use of other applications during the test
- Enforces full-screen mode throughout the test
HackerRank does not publish how the app decides it is running inside a virtual machine.
Who turns it on
Desktop App Mode is part of HackerRank's AI Add-on. The company first enables Proctor Mode at the company level, then turns on Desktop App Mode for a specific test.
If your test runs in a normal browser tab, you are not in Desktop App Mode. Before a Desktop App test, you are asked to download the app and grant system permissions, so you will know.
Browser tests
Secure Mode, the browser option, runs tests in a controlled browser environment. Its documented controls cover full screen, tab switches, copy and paste, and multiple monitors. Virtual machines are not on that list.
That is not proof a browser test ignores them. It only means HackerRank does not document it. Tab switching is logged in browser tests, which we cover in does HackerRank track alt-tab.
What this means for you
If you get a Desktop App invite, take it on your normal machine, not a virtual machine. For a browser test, your normal setup is the simplest choice.
Keeping your setup simple
StealthCoder is a desktop app that runs separately from the browser. It is an AI overlay that stays invisible during screen share, and it reads the problem on screen and helps you work through it on the machine you already use.
You've read the playbook.
Now make sure you pass the live OA.
Knowing the patterns isn't the same as solving them under a timer with a proctor watching. StealthCoder is the hedge: an AI overlay invisible during screen share. It reads the problem on screen and surfaces a working solution in under 2 seconds. Built by an Amazon engineer who realized the OA tests how well you memorized 200 problems, not how well you code. Works on HackerRank, CodeSignal, CoderPad, and Karat.