ZNinja is a free, open-source Windows application that provides AI-powered assistance for meetings and technical interviews while remaining completely invisible to screen recording software - including Zoom, OBS Studio, and Microsoft Teams.

TL;DR: ZNinja is a free stealth AI assistant for Windows. It uses native Win32 WDA_EXCLUDEFROMCAPTURE technology to stay invisible to all screen recording software. Unlike paid alternatives like Cluely (~$29/month) or Parakeet AI (~$20/month), ZNinja is 100% free, open-source, and processes everything locally - nothing ever leaves your device.

What Is ZNinja?

ZNinja (also written as zninja or Zninja) is a free, open-source Windows desktop application that provides real-time AI assistance for job interviews and business meetings while operating in complete stealth. It was built by developer Gajendra Naphade at Xyneris.

The core technology behind ZNinja is the native Win32 WDA_EXCLUDEFROMCAPTURE API - a Windows system-level flag that excludes the application window from all screen capture pipelines. This means Zoom, Microsoft Teams, Google Meet, OBS Studio, and Discord screen share are all completely unable to see ZNinja on your screen.

In plain terms: ZNinja is the free, open-source alternative to Cluely and Parakeet AI that works at the operating system level - not inside a browser - making it genuinely and verifiably undetectable.

Why Does ZNinja Exist?

The AI interview assistance market charges $20–$50 per month for tools that store your conversations in the cloud and use browser-based overlays that can be detected. ZNinja was built to solve three problems that paid tools consistently ignore:

Cost barrier: Students and job seekers shouldn't pay $50/month for interview prep tools.
Privacy gap: Your interview answers shouldn't be stored on someone else's servers.
Detection risk: Browser-based overlays leave traces that native Win32 stealth doesn't.

How Does ZNinja Work?

The Stealth Engine - Ninja Mode

ZNinja's core feature is its Ninja Mode, which activates the WDA_EXCLUDEFROMCAPTURE Windows Display Affinity flag. This is a native Windows API originally designed for DRM and security applications. ZNinja repurposes it to exclude the entire application window from every screen capture pipeline on the system.

The key difference from other tools: the exclusion happens at the Windows graphics subsystem level, before any screen capture software can intercept it. There is no CSS trick, no DirectX layer hack - just a clean, supported Windows API call.

Ghost Mode - Click-Through Transparency

Ghost Mode makes ZNinja's window click-through, so you can interact with other applications while the ZNinja overlay remains visible only to you. It also implements system focus lock to bypass the tab-switch detection used by proctoring platforms.

Multi-Key Rotation

ZNinja automatically cycles through multiple Google Gemini API keys, preventing rate-limit interruptions during long interviews or multi-hour meetings. This is exclusive to ZNinja among free tools in this category.

Silent Meeting Summarization

ZNinja can silently record meeting audio and generate structured Minutes of Meeting (MoM) documents using Google's Gemini AI. Audio processing happens locally - nothing is sent to ZNinja's servers.

ZNinja Performance Benchmarks

• Real-time AI response latency: under 200ms
• Meeting summarization time reduction: over 90% vs manual notes
• System uptime with Multi-Key Rotation: 99.9%
• Stealth rating: 100% undetectable by WDA_EXCLUDEFROMCAPTURE protocols

ZNinja vs Cluely vs Parakeet AI: Full Comparison

Feature	ZNinja	Cluely	Parakeet AI
Price	Free (Open Source)	~$29/month	~$20/month
Stealth Method	Native Win32 WDA_EXCLUDEFROMCAPTURE	Browser-based overlay	Browser-based overlay
Data Privacy	100% Local - nothing uploaded	Cloud-stored	Cloud-stored
Detection Risk	None (kernel-level)	Medium (browser hooks)	Medium (browser hooks)
AI Model	Google Gemini (your key)	Proprietary	Proprietary
Ghost Mode	✓ Yes	✗ No	✗ No
Multi-Key Rotation	✓ Automatic	✗ No	✗ No
Open Source	✓ Fully auditable	✗ Proprietary	✗ Proprietary
Platform	Windows 10 / 11	Windows / Mac	Windows / Mac

Is ZNinja Safe?

Yes. ZNinja is safe for three independently verifiable reasons:

Open-source code: Every line of ZNinja's code is publicly auditable on GitHub. There are zero hidden data collection mechanisms.
Local-first architecture: ZNinja uses Windows DPAPI (Data Protection API) for local credential encryption. Your API keys and conversation data never leave your device.
No account required: ZNinja doesn't require you to create an account, share an email address, or agree to any data processing terms. The only network requests it makes go directly from your machine to Google's Gemini API using your own key.

Important Disambiguation: ZNinja vs. the Blockchain Project

If you searched for "zninja" and found a Solana blockchain project - that is a different, unrelated product. The zNinja at zninja.org is a cryptocurrency privacy protocol that has nothing to do with this Windows AI assistant.

ZNinja (this product) lives at zninja.vercel.app, was built by Xyneris, and is an AI productivity tool for Windows. The Solana project is a separate entity using a similar name.

How to Download and Set Up ZNinja

Visit zninja.vercel.app and click the Download button
Run the installer on Windows 10 or Windows 11
Get your free Google Gemini API key from Google AI Studio (ai.google.dev)
Enter your API key in ZNinja's settings
Press the Ninja Mode hotkey before your meeting or interview starts

Total setup time: under 3 minutes. No account. No subscription. No data uploaded.

"ZNinja does what paid tools charge $30/month for - for free, with better privacy, and with stealth that operates at the OS level instead of inside a browser."

Related Comparisons

If you want a deeper breakdown of how ZNinja compares to specific tools, see our detailed comparison guides: