"Undetectable" gets used loosely in this category, so it's worth defining before comparing anything.
A genuinely undetectable meeting assistant does two things: it doesn't join your call as a visible participant, and it doesn't appear when you share your screen. Tools that join as a bot named "Otter.ai Notetaker" fail the first test. Tools that show up in your screen share fail the second — which is often the more embarrassing failure.
Here's an honest look at the main options in 2026, what each is actually built for, and the question most comparisons skip: what does it do with your call afterward?
What to actually compare
Before the list, the criteria that matter:
Visibility. Does it join the meeting as a participant? Does it appear in screen share? Does it show in recordings?
Data handling. Does it record audio? Store transcripts? Where, and for how long?
Latency. Suggestions that arrive ten seconds late are useless in a live conversation.
Platform support. Mac only, Windows only, or both? Apple Silicon or Intel?
Who it's built for. Interview prep and sales calls are different jobs with different needs.
Zaasmi
Built for: Live professional calls — sales, recruiting, consulting, client work.
How it stays hidden: Runs as a desktop app on your machine, not as a meeting participant. The window is excluded from screen capture at the OS level, so it doesn't appear in screen shares or recordings. Nobody on the call sees it in the attendee list because it isn't there.
Data handling: This is the differentiator. Audio is processed in real time and discarded — no recordings, no stored transcripts. The end-of-call summary is shown to you and not saved server-side. Custom skill documents you upload stay on your own machine. The account database is self-hosted in Germany.
Platforms: Mac (Apple Silicon) and Windows 10/11. Works with Zoom, Google Meet, and Microsoft Teams.
Pricing: $39/month or $299/year, including 40 audio-hours per month and the AI itself — no separate API key to manage. Free trial: 7 days or 2 hours, no card required.
Tradeoff: Because nothing is stored, there's no searchable archive of past calls and no long-term analytics. If you want to review what you said in a call three weeks ago, this isn't the tool.
Cluely
Built for: A broad "AI that sees your screen" pitch — interviews, sales, meetings, general use.
How it stays hidden: Overlay designed not to appear in screen share.
Data handling: Captures screen contents and audio, which are stored. This model came under serious scrutiny in 2025, when a breach exposed data from over 83,000 users — including interview transcripts, screenshots, and screen contents from confidential meetings. The root cause was reportedly admin credentials left in a public GitHub repository. A separate researcher-reported vulnerability in the desktop app was met with DMCA notices rather than a fix.
Worth knowing: The company has high visibility and an active product. But the storage-based architecture means the exposure surface is inherent, not incidental.
Final Round AI
Built for: Job interview preparation and live interview assistance.
How it stays hidden: Browser and desktop assistance positioned as not visible to the interviewer.
Data handling: Interview-focused, with session data used for prep and review features.
Worth knowing: Genuinely strong if interviews are your use case — it's tuned for that context, with question banks and role-specific prep. Less suited to ongoing professional calls like sales or client work.
LockedIn AI
Built for: Interviews and meetings, similar positioning to Final Round.
How it stays hidden: Overlay approach.
Worth knowing: Another interview-first product. If you're comparing it against Zaasmi, you're likely comparing two different jobs — one is a job-seeking tool, the other is a working-professional tool.
Otter, Fireflies, Fathom (the note-takers)
Worth mentioning because people often lump them in, but they're a different category entirely.
These are not undetectable and don't try to be. They join your meeting as a visible bot, record everything, and give you transcripts and summaries afterward. That's the product.
They're excellent at what they do. But they solve a different problem — reviewing a call later, not surviving it in the moment. And they record, which means everyone on the call is being recorded, usually with a notification.
How to choose
If you need help during the call and want nothing stored: Zaasmi. The real-time-only architecture is the point.
If you're preparing for job interviews specifically: Final Round AI or LockedIn AI are purpose-built for that.
If you want searchable archives and post-call analytics: Otter, Fireflies, or Fathom — and accept that they're visible and they record.
If you want a broad screen-aware assistant: Cluely covers the widest surface, with the security history worth factoring into your decision.
The question worth asking every vendor
Whichever direction you go, ask this before you install anything:
Does this tool store my call audio or transcripts, and if so, where, for how long, and what happens to them if I cancel?
The answer tells you more about your actual risk than any feature list will.
Zaasmi is available for Mac and Windows with a free trial — 7 days or 2 hours of live-call usage, no credit card required.
Sources: Cluely Review (2026): Pricing, Breach, Honest Verdict, What Is Cluely AI? Data Breach, Pricing, and How It Works
