Never blank on an
interview question again.
TopCoder gives you real-time AI help during technical interviews. It hears the question, analyzes the code on screen, and tells you exactly what to say. Your interviewer sees nothing.
No credit card required. Verify invisibility and try 3 free AI analyses before you pay.
Supports Python, Java, C++, JavaScript, TypeScript, Go, Rust, Swift, Kotlin, C#, Ruby, and more
Up and running in under 2 minutes
Download, verify it's invisible, try the AI free. No credit card needed.
Download and verify
Install TopCoder on your Mac and sign up. Start any video call and share your screen. Join from your phone and see for yourself: the window is completely invisible.
Try the AI for free
Get 3 free screenshot analyses. Open any coding problem, take a screenshot, and watch the AI generate a full solution with what to say, code, and complexity analysis.
Ace your interview
Choose a plan and go live. TopCoder listens in real-time, auto-detects questions, and feeds you answers your interviewer will never see.
Not just coding interviews
While coding interviews are our sweet spot, TopCoder helps across every interview format.
Coding Interviews
LeetCode, HackerRank, CoderPad, live coding. Screenshot the problem, get a full solution with code, complexity, and exactly what to say while you write it.
System Design
Upload your system design notes, architecture diagrams, and prep materials to the knowledge base. TopCoder searches them in real-time and helps you articulate trade-offs and design decisions.
Behavioral Interviews
Load your STAR stories, past projects, and talking points into the knowledge base. When the interviewer asks "Tell me about a time...", TopCoder pulls up the perfect story.
Upload anything. Search everything.
The knowledge base is your secret weapon. Upload system design notes, algorithm cheat sheets, STAR stories, company research, job descriptions, or anything else you've prepared. TopCoder indexes it all and uses it to give you answers that sound like you, not a chatbot.
100% Invisible.
Proven stealth.
TopCoder uses macOS-level window cloaking (sharingType = .none) to make itself completely invisible to screen sharing, recording, and screenshots from other apps. It does not appear in the dock, task switcher, or any screen capture.
During screen share, this is what
your interviewer sees:
Everything you need to ace the interview
From live transcription to full code solutions to your own uploaded prep materials, TopCoder has you covered.
Live Audio Transcription
Hears what your interviewer says in real-time. Automatically transcribes both sides of the conversation.
Screenshot Analysis
Capture any coding problem on screen. TopCoder analyzes it and generates a complete solution with explanation.
AI-Powered Answers
Powered by GPT-4o and Claude. Get what to say, clarifying questions to ask, solution code, and complexity analysis.
Auto-Detection
Automatically detects when you're stuck or when a new question is asked, and offers help without you pressing anything.
Knowledge Base / Notebook
Upload system design notes, STAR stories, algorithm cheat sheets, or company research. TopCoder searches your materials and weaves them into AI responses that sound like you.
Unit Test Generation
Automatically generates test cases for your solution to help you verify correctness and impress your interviewer.
Simple, transparent pricing
Pay per interview. No subscriptions, no surprises.
- ✓Full AI assistance
- ✓Screenshot analysis
- ✓Live audio transcription
- ✓Auto-detection
- ✓Knowledge base / notebook
- ✓Unit test generation
- ✓Full AI assistance
- ✓Screenshot analysis
- ✓Live audio transcription
- ✓Auto-detection
- ✓Knowledge base / notebook
- ✓Unit test generation
- ✓Full AI assistance
- ✓Screenshot analysis
- ✓Live audio transcription
- ✓Auto-detection
- ✓Knowledge base / notebook
- ✓Unit test generation
- ✓Unlimited interviews
- ✓Bring your own OpenAI key
- ✓All prepaid features included
- ✓One-time purchase, use forever
- ✓Pay OpenAI directly (~$0.05/interview)
Frequently asked questions
Yes. Topcoder uses macOS-level window cloaking (NSWindow.sharingType = .none) which makes it completely invisible to all screen sharing, recording, and screenshot tools used by other applications. This is an OS-level feature, not a hack. We encourage you to verify this yourself during onboarding.
Topcoder works with any video calling or screen sharing platform on macOS, including Zoom, Google Meet, Microsoft Teams, Webex, CoderPad, HackerRank, and any other app that uses standard screen capture APIs.
Currently Topcoder is macOS only. The stealth technology relies on macOS-specific window APIs. Windows and Linux support may come in the future.
Topcoder excels at coding interviews (LeetCode-style, system design, data structures and algorithms) but also helps with behavioral questions, technical discussions, and any interview where you need quick, accurate responses.
Topcoder uses GPT-4o for vision and code analysis, with support for bringing your own API keys (BYOK) to use any OpenAI-compatible model you prefer.
Yes. During onboarding, you get 3 free screenshot analyses to see the AI in action before purchasing a plan. You can also verify the stealth invisibility yourself.
BYOK stands for "Bring Your Own Keys." With this one-time purchase, you use your own OpenAI API key for unlimited interviews. You only pay OpenAI for what you use, typically a few cents per interview.
See it to believe it.
Download TopCoder, see for yourself that it's invisible, and try 3 free AI analyses. No credit card needed.
Download for Mac