How to Block Granola From Transcribing Your Meetings

What Is Granola and Why Should You Care?

Granola is an AI meeting transcription tool that has rapidly become one of the most popular productivity apps for knowledge workers. After raising $125 million in March 2026, the company reached a $1.5 billion valuation — making it one of the fastest-growing AI startups in the meeting productivity space.

What makes Granola different from earlier transcription tools is how it captures audio. Traditional services like the original Otter.ai or Fireflies joined meetings as visible bots — a separate participant that everyone could see and the host could remove. Granola does none of that.

Instead, Granola captures audio directly from the user's system audio pipeline. It listens to the same audio output that goes to the participant's speakers or headphones. This means:

• No bot joins your meeting
• No recording indicator appears on Zoom, Google Meet, or Microsoft Teams
• No notification is sent to any other participant
• The meeting platform has no idea Granola is running

If you want to protect your meetings from invisible transcription tools like Granola, Nullify is a free privacy tool that detects and blocks stealth transcription in real time.

The Consent Problem

When someone on your call is running Granola, every word you say is being captured, transcribed, and sent to Granola's servers — without your knowledge or consent.

This isn't a theoretical concern. Consider what's actually happening:

• Your voice data is being processed by a third-party AI model. Granola uses the captured audio to generate transcripts and meeting summaries. Your words become training data, stored content, or both, depending on Granola's data policies.
• You have no opportunity to opt out. Since you don't know the tool is running, you can't decline to be recorded. There's no consent prompt, no notification, no indicator.
• You may have legal protections being violated. In thirteen US states, recording a conversation requires the consent of all parties. In the EU, GDPR requires explicit consent for processing personal data — which includes voice recordings. Someone running Granola in a meeting with participants in California, Illinois, or Germany may be breaking the law.

For a detailed look at the legal landscape, see our article on the invisible meeting transcription problem.

Why You Can't Block Granola Through Your Meeting Platform

Because Granola operates at the system audio level rather than the meeting platform level, no setting in Zoom, Google Meet, or Microsoft Teams can prevent it from capturing audio.

• Disabling recording permissions in your meeting platform only prevents the platform's own recording feature.
• Removing bots from meetings only blocks bot-based transcription tools.
• Requiring a passcode or waiting room doesn't help — the person running Granola is already a legitimate meeting participant.

Granola doesn't need any special permissions from the meeting platform. It just needs to be installed on one participant's computer. That's it.

How to Detect and Block Granola With Nullify

Nullify is designed specifically to detect stealth transcription tools like Granola. Here's how to use it:

Step 1: Download and Install Nullify

Download Nullify from the homepage. It's available for macOS and takes less than a minute to install. The app is free — no account required, no subscription.

Step 2: Let It Run in the Background

Once installed, Nullify runs quietly in your menu bar. It uses minimal system resources and doesn't interfere with your meetings or any other applications. You don't need to start it before each meeting — it's always watching.

Step 3: Nullify Detects Granola's Process Signature

Nullify continuously monitors your system for the process signatures of known transcription tools. When it detects Granola's process running on your machine — or network patterns consistent with audio being sent to Granola's servers — it immediately triggers an alert.

The detection works through two complementary methods:

• Process monitoring: Nullify identifies Granola's executable and its associated background processes. Even if Granola updates its process name, Nullify's detection signatures are regularly updated to match.
• Network analysis: Nullify watches for outbound connections to Granola's known API endpoints and audio processing servers. This provides a second layer of detection that's independent of process names.

Step 4: Get Alerted and Activate Audio Shield

When Granola is detected, Nullify shows a clear notification telling you exactly what was found. At this point, you have two options:

1. Know and decide. Simply knowing that Granola is active may be enough. You can choose to address it directly with the meeting participant, leave the meeting, or continue with awareness.

2. Enable Audio Shield. Nullify's Audio Shield feature introduces carefully calibrated audio perturbations that disrupt AI transcription while remaining minimally perceptible to human listeners. The meeting sounds normal to everyone on the call, but Granola's transcript becomes unreliable and fragmented.

How Audio Shield Works

Audio Shield doesn't mute your microphone or add obvious noise. Instead, it applies targeted audio modifications that exploit known weaknesses in speech-to-text models:

• Ultrasonic perturbations that are inaudible to humans but confuse transcription models
• Subtle spectral modifications that preserve speech intelligibility for human listeners while degrading automated transcription accuracy
• Timing-based disruptions that interfere with the audio segmentation that transcription models rely on

The result: your meeting continues normally for all human participants, but any stealth transcription tool capturing the audio gets a degraded, unreliable transcript.

What If Someone Else Is Running Granola?

This is the harder scenario. If another participant in your meeting is running Granola on their own computer, Nullify on your machine can't directly detect their local process.

However, Nullify still helps in several ways:

• Audio Shield protects your outbound audio. When enabled, the audio modifications are applied to your microphone output before it reaches the meeting platform — meaning the audio that arrives at the other participant's speakers (and therefore Granola's capture) is already protected.
• Network detection may still work. If you're on the same network as the participant running Granola (such as in an office setting), Nullify's network monitoring can potentially detect the traffic patterns.
• Awareness is protection. Just knowing that tools like Granola exist and are widely used changes how you approach sensitive conversations. You can ask participants directly, establish recording policies for your team, or move sensitive discussions to more controlled channels.

For a broader guide on detecting all types of secret meeting transcription, see our article on how to detect if someone is secretly transcribing your meeting.

Take Back Control of Your Meeting Privacy

Granola is a $1.5 billion company with millions of users. It's well-funded, well-designed, and intentionally invisible. The only way to protect yourself from stealth transcription is to detect it at the same level it operates — the system level.

That's what Nullify does. It watches for the tools that are watching you.

Download Nullify for free and protect your meetings from invisible transcription.