TechScreen vs InterviewCoder vs Cluey: Which AI Interview Tool Actually Works in 2026?

The Rise of AI-Powered Interview Assistance

Software engineering interviews have never been harder. In 2026, multi-round technical assessments at major companies routinely span four to six hours across several days. Algorithms, system design, behavioral questions, and take-home projects have all become standard components of the process — even for mid-level positions. The bar has risen dramatically.

At the same time, AI has matured to a point where it can meaningfully assist with all of these components in real time. This intersection — harder interviews, more capable AI — has created a new product category: the invisible AI interview assistant. These are tools that operate silently in the background during live interviews, processing what is being asked and surfacing accurate, structured suggestions without appearing on screen shares or triggering proctoring software.

Three products have emerged as the clear frontrunners in this space: TechScreen, InterviewCoder, and Cluey. If you are trying to decide which one to use before your next interview, this comparison will save you hours of research and give you the honest picture.

What Is TechScreen?

TechScreen is an invisible AI assistant built from the ground up for technical interviews. It runs as a standalone desktop application that is completely invisible to screen-sharing tools, including Zoom, Google Meet, Microsoft Teams, and the in-browser capture used by platforms like HackerRank and CoderPad.

When an interviewer presents a coding problem or launches into a system design question, TechScreen captures the audio context and delivers structured, accurate suggestions within a few seconds. The response appears on your screen — a discreet panel you can position wherever you want — while the interviewer sees nothing beyond your code editor.

The invisibility layer is where TechScreen genuinely differentiates itself. The application integrates at the OS level with how screen capture works, rather than relying on simple window-hiding tricks that other tools use. This means it remains invisible even on platforms that actively try to detect overlay applications or secondary windows.

TechScreen supports live coding environments including HackerRank, LeetCode, CoderPad, Karat, and Codility. It handles the full range of technical interview content: dynamic programming, graphs, trees, binary search, system design, database design, and behavioral prompts. It uses a token-based subscription model and offers three free tokens so you can test the product before you spend anything.

What Is InterviewCoder?

InterviewCoder is one of the earliest entrants in the AI interview assistance space and built a significant following through viral social media demonstrations. Its core pitch is similar to TechScreen: invisible AI assistance during live coding interviews, capable of solving LeetCode-style algorithmic problems in real time.

The product gained credibility quickly because of the quality of its solutions on standard algorithm problems. Paste or screenshot a problem and InterviewCoder returns a clean, commented solution in your preferred language. For candidates whose main concern is the algorithmic portion of their interview, it delivers real value.

However, InterviewCoder has faced persistent challenges with detection reliability. Several candidates have reported that certain platforms, particularly those using advanced browser-level screen capture or webcam proctoring, have flagged or been able to see InterviewCoder's output window. The product has gone through multiple iterations trying to close these gaps, which has caused instability for some users during important interviews.

InterviewCoder is strongest for pure algorithmic coding rounds on mainstream platforms and weaker for system design, behavioral rounds, or niche enterprise interview tools.

What Is Cluey?

Cluey takes a broader approach than the other two. Rather than focusing purely on the live interview moment, Cluey positions itself as an end-to-end interview preparation and assistance platform. It includes structured mock interview modules, question libraries organized by company and role, and a real-time assistance mode for live interviews.

For candidates who want a single platform covering both preparation and the interview itself, Cluey has clear appeal. The preparation features are genuinely solid: the mock interview system gives you realistic reps, and the question libraries are well-organized by company, difficulty, and topic.

The trade-off is depth in the live assistance mode. Cluey"s real-time suggestion quality for complex algorithmic problems lags behind both TechScreen and InterviewCoder. Where it does perform well is in behavioral interviews: it can help you structure STAR-method responses quickly and accurately, which is useful if your bottleneck is the PM-style or behavioral rounds rather than the coding challenge.

Its stealth capabilities are also less mature. On platforms with active detection measures, Cluey is more likely to be visible than TechScreen, which limits its usefulness for high-stakes interviews at companies with rigorous technical infrastructure.

Head-to-Head: Where Each Tool Wins

Here is the honest breakdown of how these three tools compare across the dimensions that actually matter when you are preparing for a real interview:

• Invisibility and stealth: TechScreen is the clear leader. Its OS-level integration makes it the most reliably undetectable of the three across all major platforms. InterviewCoder is solid but has had documented detection issues. Cluey lags behind on this dimension.
• Algorithmic coding support: TechScreen and InterviewCoder are roughly equivalent for standard LeetCode-style problems. Both deliver high-quality solutions quickly. TechScreen edges ahead for harder, multi-constraint problems where solution quality matters more than speed.
• System design support: TechScreen is the strongest here. It provides structured, scalable design suggestions covering components, trade-offs, and capacity estimates. InterviewCoder's system design support is limited. Cluey covers the basics.
• Behavioral interview help: Cluey leads in this area, with TechScreen a close second. InterviewCoder is primarily focused on coding and offers minimal behavioral assistance.
• Platform compatibility: TechScreen supports the widest range of platforms including HackerRank, CoderPad, LeetCode, Karat, Codility, and standard video call tools. InterviewCoder covers most major ones. Cluey's live mode is more limited.
• Pricing flexibility: All three offer entry-level access. TechScreen's token model is the most flexible for occasional use, since you only consume tokens when you actually use the tool.
• Reliability and uptime: TechScreen and Cluey have been more stable. InterviewCoder has had periods of instability, particularly around major platform updates.

Which Should You Choose?

If your next interview involves a live algorithmic coding challenge — on HackerRank, LeetCode, CoderPad, or a similar platform — TechScreen is the most reliable choice. Its invisibility layer is the most battle-tested, its solution quality is consistently high, and its broad platform support means you are unlikely to encounter compatibility issues on interview day.

If your interview process involves a significant behavioral component and you want a single tool that helps with both preparation and the live interview, Cluey is worth considering alongside TechScreen. Many candidates use Cluey for preparation and switch to TechScreen for the live interview itself.

InterviewCoder remains a viable option, particularly for candidates who are already familiar with it and have tested it on their specific interview platform. If you are starting fresh and evaluating tools for the first time, however, TechScreen is the lower-risk choice given InterviewCoder's history of detection-related issues.

The Bigger Picture: AI Assistance and Interview Fundamentals

Whichever tool you choose, it is worth being clear-eyed about what AI interview assistance actually does. These tools are accelerators, not replacements for preparation. TechScreen helps you move faster, structure your thinking under pressure, and avoid blanking on problems you genuinely understand. It does not conjure knowledge that was never there.

The candidates who get the most out of AI interview tools are those who have done the underlying preparation: they have studied algorithms, they understand system design principles, and they have practiced communicating their thought process. The AI fills in gaps, removes time pressure from the solution process, and helps them perform closer to their actual ceiling rather than below it because of nerves or pressure.

Think of it the way professional athletes think about equipment. The best runners wear the best shoes — not because the shoes do the running, but because removing unnecessary friction lets the athlete's actual ability come through. AI interview tools work the same way.