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Undetectable AI for interviews with a verified knowledge base

Ask your question by voice or text without ever leaving the live coding window — OfferHack delivers an answer in seconds, powered by a hand-curated knowledge base and fast AI models from leading providers.Voice or text — right from your editor. Verified knowledge base answers in seconds.

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What are the main principles behind EventLoop?

Main Principles of EventLoop

1. Single-threaded JS and Call Stack

The engine has:

Call Stack — this is where your code executes line by line.
Heap — memory for objects (not important for event loop right now).

While there are functions on the stack, JS is busy and cannot do anything else — it cannot handle events or fire timers.

console.log('1');

setTimeout(() => {
  console.log('2 (timeout)');
}, 0);

Try it yourself

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Keyboard capture

Flexible background display settings for any task

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Fast responses without long pauses

Send a screenshot via hotkey. AI automatically recognizes the task text.

Keyboard capture — type into the app without losing focus on your current window. Activated via hotkey

Main App Features

Trustworthy Answers via RAG

Unlike competitors who rely on a small user-supplied context file, we maintain a large knowledge base of hand-curated, verified questions. When you submit a query, the system retrieves the most relevant entries from this base and feeds them to the AI, which composes its response based on that — producing consistently high-quality answers.

EvilCorp Code

PureSkillich

KabanKabanich

// Problem C — Minimum Latency Network Routing OfferHack Round 2

// Given n servers, m bidirectional links (latency + bandwidth), and q communicating pairs

// — find routing that minimizes max end-to-end latency.

package main

import ("fmt"; "sort"; "bufio"; "os")

func solve(n, m, q int, edges []Edge, demands []Demand) int {

// Build adjacency list with latency and bandwidth

adj := make([][]Link, n)

for _, e := range edges {

adj[e.u] = append(adj[e.u], Link{e.v, e.w, e.b})

adj[e.v] = append(adj[e.v], Link{e.u, e.w, e.b})

}

// Binary search on maximum allowed latency

lo, hi := 0, 500*1000000

for lo < hi {

mid := (lo + hi) / 2

if feasible(adj, demands, mid) {

hi = mid

} else {

lo = mid + 1

}

return lo

}

What are the main principles behind EventLoop?

Main Principles of EventLoop

1. Single-threaded JS and Call Stack

The engine has:

Call Stack — this is where your code executes line by line.
Heap — memory for objects (not important for event loop right now).

While there are functions on the stack, JS is busy and cannot do anything else — it cannot handle events or fire timers.

console.log('1');

setTimeout(() => {
  console.log('2 (timeout)');
}, 0);

Captured Request

RAG Retrieval

AI Processing

Answer Generating

Seamless Input Without Focus Loss

Unlike competitor solutions, our app lets you type queries to the AI without losing focus on your active window. Input mode is triggered by Hold-to-Type or Toggle hotkeys, so you can comfortably enter queries without arousing your interviewer's suspicion.

EvilCorp Code

PureSkillich

KabanKabanich

// Problem A — QuickSort OfferHack Round 1

// Write a QuickSort implementation in Go.

What are the main principles behind EventLoop?

Main Principles of EventLoop

1. Single-threaded JS and Call Stack

The engine has:

Call Stack — this is where your code executes line by line.
Heap — memory for objects (not important for event loop right now).

While there are functions on the stack, JS is busy and cannot do anything else — it cannot handle events or fire timers.

console.log('1');

setTimeout(() => {
  console.log('2 (timeout)');
}, 0);

PureSkillich

KabanKabanich

⌃+⌥+⌘

Keyboard capture

Keyboard capture mode active

OS-Level Invisibility

Seamlessly blend the app into your workspace. The application is completely invisible at the system level, giving you an unobstructed view of your work while keeping the tool right at your fingertips.

ofr-hack-meet12:34 PM

PureSkillich

KabanKabanich

What are the main principles behind EventLoop?

Main Principles of EventLoop

1. Single-threaded JS and Call Stack

The engine has:

Call Stack — this is where your code executes line by line.
Heap — memory for objects (not important for event loop right now).

While there are functions on the stack, JS is busy and cannot do anything else — it cannot handle events or fire timers.

console.log('1');

setTimeout(() => {
  console.log('2 (timeout)');
}, 0);

Other notable features

0:30

Explain how EventLoop handles microtasks and the call stack in Node.js

Transcribed in 0.3sWhisper Large v3 Turbo

Voice Input & Instant Transcription

Speak your question, hit the hotkey, get an instant transcription and AI response — completely hands-free. Average transcription takes 0.3–0.6 seconds using Whisper Large v3 Turbo — the most advanced speech recognition model available.

⌃+⌘+⌥Keyboard interception

⌘+⌥+⇧Screenshot

⌘+XCapture last 30s audio

Full Hotkey Control

Invisible keystrokesHotkeys are intercepted at OS level — the active app and your interviewer never see the keypress

Keyboard interceptionType directly into OfferHack without switching windows

Screenshot captureSend a screenshot of your screen to AI for analysis

Audio captureRecord and transcribe the last 30 seconds of audio

Hold to TypeHold a modifier key to temporarily intercept keyboard input

Toggle blurInstantly show or hide the app background overlay

Window moveReposition the app window with modifier + arrow keys

Toggle all hotkeysEnable or disable all hotkeys at once

Minimize / Restore windowQuickly hide or bring back the app window

Customizable keyboard shortcuts for maximum efficiency.

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OfferHack — hidden from ⌘Tab, screen share, recordings

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Tint opacity30%

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Toggle blur, adjust tint, fit your workflow.

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Gemini 2.5 Flash Lite

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Grok 4.1 Fast

DeepSeek V3.2

Claude Sonnet 4

GLM 4.7

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Switch between the world's fastest models directly from the interface.

Works for any interview type

ofr-hack-meet12:34 PM

PureSkillich

KabanKabanich

What are the main principles behind EventLoop?

Main Principles of EventLoop

1. Single-threaded JS and Call Stack

The engine has:

Call Stack — this is where your code executes line by line.
Heap — memory for objects (not important for event loop right now).

While there are functions on the stack, JS is busy and cannot do anything else — it cannot handle events or fire timers.

console.log('1');

setTimeout(() => {
  console.log('2 (timeout)');
}, 0);

Answers any type of theory questions

What are the main principles behind EventLoop?

Main Principles of EventLoop

1. Single-threaded JS and Call Stack

The engine has:

Call Stack — this is where your code executes line by line.
Heap — memory for objects (not important for event loop right now).

While there are functions on the stack, JS is busy and cannot do anything else — it cannot handle events or fire timers.

console.log('1');

setTimeout(() => {
  console.log('2 (timeout)');
}, 0);

Use it during LiveCoding interviews

Works for any tech stack

What are the main principles behind EventLoop?

Main Principles of EventLoop

1. Single-threaded JS and Call Stack

The engine has:

Call Stack — this is where your code executes line by line.
Heap — memory for objects (not important for event loop right now).

While there are functions on the stack, JS is busy and cannot do anything else — it cannot handle events or fire timers.

console.log('1');

setTimeout(() => {
  console.log('2 (timeout)');
}, 0);

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Frequently asked questions

Everything you need to know before getting started

No. OfferHack operates at the OS level as an invisible overlay. It is excluded from screen capture APIs used by Zoom, Google Meet, Microsoft Teams, and other conferencing platforms. Interviewers only see your normal desktop — OfferHack never appears in any screen share, recording, or screenshot.

OfferHack does not inject into other processes, modify browser behavior, or appear in task lists visible to proctoring tools. It runs as a system-level overlay that is architecturally invisible to any screen capture mechanism.

OfferHack captures your system audio and transcribes it in real time using advanced speech recognition. No microphone sharing or browser extensions required — it works with any audio source playing on your device.

Keyboard capture mode lets you type queries directly into OfferHack without losing focus on your active window — for example, while you're working in a code editor or coding platform. There are two ways to activate it. Toggle — press the hotkey once to turn the mode on, press it again to turn it off. Hold to Type — hold a modifier key and the mode stays active for exactly as long as you hold it; the moment you release the key, the mode switches off automatically. In both cases, keystrokes are intercepted by OfferHack and never reach the active application — the interviewer sees neither your input nor the hotkey presses.

No. When you press an OfferHack hotkey, the keypress is intercepted at the OS level and never reaches the active application. The interviewer sees neither the keystroke nor any reaction from their app. If you bind an OfferHack hotkey that overlaps with a system or app shortcut, OfferHack takes priority — the original command will not fire as long as the hotkey is bound in OfferHack.

Responses typically appear within 3–5 seconds depending on the model you select. Gemini Flash Lite (available on the free plan) is the fastest. Premium models like GPT-4o and Claude provide deeper, more detailed analysis.

Yes. OfferHack works alongside any application because it operates at the OS level, not as a browser plugin or extension. It's compatible with any video conferencing tool, coding platform, or screen sharing software.

The free plan gives you 67 credits and access to Gemini 2.5 Flash Lite. That's enough to test OfferHack in a real or practice interview before committing to a paid plan. No credit card required.

Premium ($20/mo) gives you 25× more credits than the free plan with access to all 6+ AI models — ideal for one interview per day. Ultimate ($50/mo) gives you 75× more credits, designed for three interviews per day during active job search sprints.

Yes, no contracts or commitments. You can cancel your subscription at any time before your next billing cycle with a single click.

OfferHack uses RAG-verified answers cross-referenced against trusted sources for maximum accuracy. You also have access to 6+ different AI models, so you can get multiple perspectives. Remember — OfferHack is a copilot, not autopilot. You stay in control and deliver answers in your own words.