Is it legal to use Nullify?

Yes, absolutely. Nullify runs locally on your own computer and simply monitors what software is active during your meetings. It's the equivalent of checking your Task Manager. In fact, many jurisdictions give you the legal right to know when you're being recorded — Nullify helps you exercise that right.

Does Nullify block Granola from running?

Nullify offers multiple protection levels. At its base level, it detects transcription tools and alerts you. With Audio Shield enabled, it can disrupt transcription accuracy using psychoacoustic perturbation — making the captured audio unintelligible to AI while sounding normal to humans.

Will people on the call hear the audio shield?

No. The Audio Shield uses psychoacoustic techniques designed to be imperceptible to human ears while disrupting AI speech-to-text systems. Other participants will hear your normal voice. The perturbation targets the specific frequency patterns that transcription algorithms rely on.

Does it work with Zoom, Google Meet, Microsoft Teams?

Yes. Nullify works with all major meeting platforms including Zoom, Google Meet, Microsoft Teams, Webex, and others. It monitors at the system level, so it detects transcription tools regardless of which meeting platform you're using.

How do I know if someone is recording my meeting?

Traditional platform indicators (like the red recording dot) only detect in-platform recording. Stealth tools like Granola bypass these entirely. Nullify monitors for process-level and network-level signatures of known transcription tools, catching what platform indicators miss.

Is Granola recording without my consent legal?

It depends on your jurisdiction. In 13 U.S. states (including California, Illinois, and Florida), all parties must consent to recording. Under GDPR in Europe, recording without consent violates data protection laws. The Otter.ai class-action lawsuit shows this is an active legal issue. Regardless of legality, you deserve to know when you're being recorded.

Meeting Privacy Protection

Your Meetings Are Being Recorded. You Just Don't Know It.

Name: Nullify
Availability: InStock
Author: Nullify

Nullify detects and blocks invisible meeting transcription tools like Granola, Otter.ai, and Fireflies — before they can transcribe a single word.

Nullify is a free, open-source desktop application for macOS and Windows that detects and blocks invisible AI meeting transcription tools. It monitors for stealth software like Granola, Otter.ai, Fireflies, Read.ai, Fathom, and others that capture meeting audio without visible indicators or participant consent. With its Audio Shield feature, Nullify uses psychoacoustic perturbation to disrupt AI transcription while keeping your voice sounding normal to other participants.

Download Free View on GitHub

Free & Open Source•macOS & Windows•100% Local & Private

The Invisible Transcription Problem

A new generation of AI meeting tools doesn't join as a visible bot. Instead, they silently capture your system audio — making them invisible to everyone else on the call.

Granola: $1.5B Valuation

Granola raised $125M at a $1.5B valuation on March 25, 2026. It captures meeting audio through your system's audio pipeline — no bot, no indicator, completely invisible to other participants.

Otter.ai Class-Action Lawsuit

Otter.ai is facing a class-action lawsuit for recording meetings without proper consent from all participants. If you were on a call with an Otter user, you were likely recorded without knowing.

Stanford Bans AI Bots

Stanford University has officially banned AI meeting bots from its meetings, recognizing the privacy threat they pose. When elite institutions take notice, the problem is real.

13 States Require Consent

Thirteen U.S. states have two-party (all-party) consent laws for recording. Plus GDPR in Europe. Recording someone without consent isn't just rude — it may be illegal.

How It Works

Three simple steps to protect your meeting privacy.

Install Nullify

Download and install the free desktop app. Available for macOS and Windows.

Runs in Background

Nullify quietly monitors during your meetings. Zero impact on performance.

Instant Alerts

Get notified immediately if a transcription tool is detected. Take action before a single word is transcribed.

What We Detect

Nullify detects all major meeting transcription tools — including the invisible ones.

Tool	Type	Network Detection
Granola	Stealth
Otter.ai	Bot + Stealth
Fireflies.ai	Bot
Read.ai	Stealth
tl;dv	Bot
Fathom	Stealth
Supernormal	Bot	Coming soon
Tactiq	Extension	Coming soon

GranolaStealth

ProcessNetwork

Otter.aiBot + Stealth

ProcessNetwork

Fireflies.aiBot

ProcessNetwork

Read.aiStealth

ProcessNetwork

tl;dvBot

ProcessNetwork

FathomStealth

ProcessNetwork

SupernormalBot

ProcessNetwork

TactiqExtension

ProcessNetwork

How to block Granola →How to block Otter.ai →Detect secret transcription →

Built for Privacy

Everything you need to protect your meetings from invisible surveillance.

Real-Time Detection

Continuously monitors your system for active transcription tools. Detects them the moment they start.

Audio Shield

Psychoacoustic perturbation technology that disrupts transcription accuracy without affecting human conversation.

4 Protection Levels

From Stealth (silent monitoring) to Maximum (full audio shield). Choose the level that fits your needs.

100% Local

Everything runs on your machine. No data is ever sent to external servers. Your conversations stay yours.

Invisible Operation

Runs silently in your system tray. Other meeting participants will never know it's there.

Open Source

Fully open source and auditable. Verify exactly what the app does. No hidden functionality, no tracking.

Download Nullify

Free, open source, and ready to protect your meetings.

Download Free

macOS

macOS 12 (Monterey) or later
Apple Silicon or Intel
~50MB disk space

Windows

Windows 10 or later
x64 architecture
~50MB disk space

Support the Project

Nullify is free and open source. If you find it useful, consider supporting its development.

Buy Me a Coffee Star on GitHub

Frequently Asked Questions

Everything you need to know about Nullify.