Is Ultracode detectable? I tested it against every major proctoring tool in 2026 and here’s what I found
After my last YouTube video proving Interview Coder is detectable went viral, I kept getting the same question: What about Ultracode? I am working on a full video about this, but in the meantime I thought I’d share some of the highlights here.
I did a full review of Ultracode this time last year, but since then, a lot has changed. Interview platforms like CoderPad and HackerRank have completely overhauled their detection mechanisms. Given I still have lifetime access to Ultracode pro from my first review, I thought I would do a 2026 update.
Over the last couple months, there have been a few posts claiming Ultracode is now detectable. If those claims hold up, candidates considering Ultracode — which is now close to a thousand dollars — need to know. But all of those claims share one thing in common: they’re all posted in Interview Coder’s own subreddits, with no proof or sources. Interview Coder making stuff up about a competitor wouldn’t exactly be surprising. Interview Coder’s subreddit is famous for astroturfing and slander.
The pattern is hard to miss once you start looking. Every negative post about Ultracode like those claiming it’s detectable are exclusively in r/interviewcoderHQ and r/InterviewCoderPro. Both are Interview Coder’s own official subreddits. None of the posts include screenshots, video, or any actual testing or proof. None reference specific Ultracode builds, platform versions, or proctoring software. If you’re trying to figure out whether an AI interview tool actually works, posts in Interview Coder’s subreddit are the last thing you should trust — especially when the post is about a competitor.
Anyway, I prefer data over claims. So I figured I would run actual tests on enterprise grade proctoring accounts on CoderPad, HackerRank, and Chime (what we use at Amazon where I work). I will also show you how you can do the same testing on your own device for free so you don’t have to just take my word for it!
The setup
My friends at Meta and Oracle helped me out with the CoderPad and HackerRank accounts on their end. For Chime, I used my own Amazon account as an Amazon employee. I ran the whole test on both my personal Windows 11 laptop and the latest MacBook Pro running macOS 26, since a lot of you specifically asked about Mac.
While I was at it, I figured I would also run the same protocol against the other three big AI interview tools — Interview Coder, Cluely, and Interviewman. Same enterprise accounts, same hardware, same day. The cleanest way to answer whether Ultracode has slipped is to put it side-by-side against the rest of the category and see if any of them are doing better.
The protocol was simple. Phase 1: share my screen with the tool running idle in the background. Phase 2: actually use the tool by triggering its hotkeys while sharing. My friends would tell me what showed up on the interviewer side.
Phase 1: Screen sharing with AI tool open
This one was clean across the board. Ultracode didn’t show up on any of the screen shares. Neither did Interview Coder, Cluely, or Interviewman. No flags, no alerts, nothing. All four apps were 100% invisible to screen sharing.
Phase 2: Solving using the AI tool
This is where Interview Coder fell apart in my last video. So I was watching this part closely.
I started by testing Interview Coder again to see if they had shipped any updates since my last video two months ago. Spoiler alert: they hadn’t. Shared my CoderPad session, hit the solve hotkey. My friend at Meta immediately got an “unauthorized application interaction detected” alert. Same outcome on HackerRank. Identical to what I caught in March 2026.
I figured I’d push the test onto Chime while I had everything open. Hosted a meeting with myself on a second device acting as the interviewer, shared my screen, hit the Interview Coder solve hotkey. Flagged on the host side immediately. Interview Coder was instantly detectable on CoderPad, HackerRank and Chime when you press any of its hotkeys.
Next up was Cluely. Cluely is probably the most marketed AI interview tool of the four, so I went in curious about whether it had any actual technical differentiation under the hood. It doesn’t. Cluely got flagged on CoderPad within seconds of the first solve press, flagged on HackerRank just as fast, and flagged on Chime the moment I hit a hotkey while screen sharing. Cluely was instantly detectable on CoderPad, HackerRank, and Chime when you press any of its hotkeys.
Then Interviewman. Interviewman is the newest of the four tools and the cheapest, so I wanted to see if a fresh build had figured out anything the older tools hadn’t. It hadn’t. Flagged on CoderPad, flagged on HackerRank, flagged on Chime — same detection pattern, same speed. Interviewman was instantly detectable on CoderPad, HackerRank, and Chime when you press any of its hotkeys.
Ultracode was the only outlier. I shared my screen on CoderPad and pressed the solve hotkey. My friend got zero flags or alerts. I tried pressing some of their other hotkeys like those to move the application and make it minimize and reappear. Still nothing. Same on HackerRank with the friend at Oracle. Same on Chime when I hosted the meeting myself. Clean across all three. Ultracode was undetectable on CoderPad, HackerRank, and Chime no matter what hotkey I pressed.
The results above were the same on both my Windows and Mac laptops. I’m not gonna lie. When I first saw all the claims on Ultracode’s website that it is the only app that is still undetectable I thought it was pure marketing bullshit. I was wrong.
Test it yourself in 60 seconds
I am a firm believer in showing rather than telling. So instead of telling you to just take my word for all of this I am going to show how you can test the detectability of ANY AI app for free on your own device. Best of all, you can do this even if you don’t have friends at Meta or Oracle.
The same detection mechanism that catches most cheating apps on CoderPad and HackerRank is one you can test in your browser, for free, in under a minute. No downloads, no enterprise account, no Meta friend required. All you need is a keyboard event viewer.
Google “keyboard event viewer” and pick any of the free ones — I used the W3C tool, which is open source, but any of them work. Launch the AI interview tool you’re considering buying. Press its solve hotkey with the keyboard event viewer tab open. Watch whether the browser tab logs any keys being pressed. If anything gets logged, that tool is 100% detectable.
CoderPad, HackerRank, and the rest of the browser-based interview platforms all run as web apps in a browser tab on the candidate’s laptop. They detect AI interview hotkeys using the same JavaScript keyboard APIs your free event viewer uses. If your browser tab can pick up the hotkey, the CoderPad tab running your interview can pick it up too. The only way an AI interview tool stays invisible to a browser-based proctor is if it bypasses the browser’s event layer entirely.
I ran this test for all four AI interview tools. Interview Coder, Cluely, and Interviewman all had keystrokes get logged when I tried to press their solve hotkeys. Ultracode was the only tool that rendered zero keystrokes on the keyboard event logger even when I tried spamming all their hotkeys at once— same result as when I pressed Ultracode’s hotkeys on CoderPad, HackerRank, and Chime.
If you’re evaluating any AI interview tool, run this 60-second browser test before you spend money on it. If the keyboard event logger flags any keystrokes when you press solve, so will CoderPad and HackerRank.
How this works architecturally
I was fascinated by how Ultracode somehow got their hotkeys to be undetectable while all the other tools I tested got flagged. I dug into the technical side of this and here’s what I learned.
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When most apps need a global hotkey, they use standard user-space APIs: RegisterHotKey or WH_KEYBOARD_LL on Windows, CGEventTap or NSEvent on macOS. These APIs are well documented and well supported, but they're also observable at the browser level by design. Any process running at user-level privilege can see them. That's how proctoring software detects hotkeys from AI interview tools. It's not magic, it's just APIs.
Interview Coder, Cluely, and Interviewman all appear to be built on these standard user-space APIs, which is why all three show up identically on both enterprise proctoring dashboards and free browser keyboard viewers. Their architectures are observable.
Ultracode’s test results aren’t consistent with user-space hotkey handling. Ultracode appears to handle hotkeys below the user-space layer that proctoring software can observe. The company hasn’t disclosed the implementation publicly so I’m not going to speculate. But the test data is pretty clear that something is architecturally different.
This isn’t a quick fix. It’s months of low-level systems engineering plus the kind of signing infrastructure most early-stage startups don’t have. That’s most likely why Interview Coder still hasn’t shipped a fix. Cuz it requires essentially rewriting the entire app.
Okay it’s undetectable. But is it actually any good?
Undetectability is worthless if it gives you the wrong answer. So I also evaluated each AI interview tool on the three most common types of interview questions — leetcode, system design and behavioral. Here’s how Ultracode, Interview Coder, Cluely, and Interviewman compared.
LeetCode hards
I tested all four AI interview tools — Ultracode, Interview Coder, Cluely, and Interviewman — on the same 20 LeetCode hard problems. The results:
- Ultracode: 19/20 Correct
- Interview Coder: 12/20 Correct
- Interviewman: 9/20 Correct
- Cluely: 7/20 Correct
None of the four AI interview tools got all 20 questions right. Ultracode’s 95% accuracy was the closest. Every tool in this space markets itself as giving perfect answers 100% of the time, but none can actually deliver that when dealing with LeetCode Hards. If you walk in expecting perfection, you’ll be disappointed eventually. That being said, Ultracode had substantially higher accuracy than InterviewCoder, Interviewman and Cluely.
System design
Next I tested a system design question. In the age of AI, companies are putting more emphasis on the system design round than every before to ensure candidates won’t just vibe code a mountain a tech debt.
I gave each tool the same prompt: “design Tinder.” Deliberately broad, which is what real system design questions look like.
Interview Coder, Cluely, and Interviewman all did the same thing — each one picked its own assumptions about scale, geography, and monetization, then dumped out a system based on those assumptions. That’s the opposite of how a real system design interview works. The interviewer wants you to ask clarifying questions before you start drawing boxes. A tool that skips that step will bomb the interview every time.
Ultracode has a different user experience. It first generated a list of clarifying questions for me to ask the interviewer based on the broad original question asked.
I can then ask as many or as few of those questions as I want. Ultracode listens to the interviewer’s answers for each. Then when I press solve again, Ultracode builds the response around what the interviewer actually told me. The final answer generated would definitely pass the bar at Amazon.
Behavioral
Behavioral questions is where Ultracode fell short when I reviewed it last year; it’s a year later and that is still where Ultracode falls short.
Ultracode claims to offer behavioral support. When I think “behavioral support” I mean: upload my resume, paste my LinkedIn, tell the tool the role I’m interviewing for, and get answers that use my actual past experiences. STAR framework with real situations.
Instead it just gives generic answers. They generally follow the STAR framework but they have nothing to do with MY previous work history. Ultracode doesn’t support resume uploads, profile imports, or any personalization for behavioral interview questions.
I emailed Ultracode’s support team to ask if behavioral personalization was on the roadmap. Their response, paraphrased: it isn’t, and it won’t be. They’ve made a deliberate decision not to ingest or store any personal information about their users.
That’s a defensible product decision from a privacy standpoint, but the consequence is that Ultracode’s behavioral mode is borderline useless. I’d honestly prefer if Ultracode dropped the behavioral framing entirely and just marketed itself as a technical-only AI interview tool.
The verdict
Buy Ultracode if your interview loop is mostly technical — FAANG software engineering, LeetCode hards, system design rounds. If detectability matters to you (and at this price it should), Ultracode is the only AI interview tool I’ve tested in 2026 that is still undetectable on CoderPad, HackerRank, CodeSignal, Chime etc.
Skip Ultracode if the thing you need assistance on most is behavioral questions — anything like Amazon leadership principle loops, manager interviews, anything where “tell me about a time” is half or more of the loop.
To answer the question that got me to do this update: a year after my original review, yes — Ultracode is still undetectable on CoderPad, HackerRank, and Chime as of June 2026, on both Windows 11 and macOS 26. The rumors floating around competitor subreddits don’t hold up to actual testing. And on the broader question of whether Ultracode is still the best AI interview tool: yes — Interview Coder, Cluely, and Interviewman all got flagged on the same protocol, and they’re all measurably worse on coding accuracy and system design.
FYI: this article is for informational purposes only. I don’t recommend or endorse using any tools in ways that violate interview or platform rules. I am simply following up on the state of SWE interviews in 2026 vs my predictions from my Medium post last year.
