How often do voice assistants activate by accident?

In a 2020 lab test, some smart speakers woke by mistake at about one time per hour. A Google Home Mini averaged 0.95 activations per hour on one show, and the Apple HomePod averaged 0.38 per hour across all the shows. Those are lab figures for TV audio, not measurements of a real home, so use them to understand the scale, not to predict your count.

Lab tests recorded about one false wake per hour on some devices

A 2020 study from Northeastern University and Imperial College London played TV shows to smart speakers and logged every activation that happened without the wake word. A Google Home Mini that was playing The West Wing averaged 0.95 activations per hour without the wake word ¹. Across all the shows, the Apple HomePod averaged 0.38 activations per hour without the wake word ².

The same study found no evidence that the devices constantly record conversations. It did find that they wake frequently, usually for short intervals ³. So the risk is not a microphone that never stops. It is a short, unintended recording each time the device mistakes a sound for its wake word.

Why the count matters less than what gets captured

A false wake is only a problem if speech follows it. Google says Gemini apps wait in standby until activated, and that audio recordings may begin a few seconds before activation ⁴. That is why a short, frequent misfire can still put private words on a server, even when the count is low.

It depends on the device and the show

The rates differ by device and by what the device hears. Newer models may behave differently from the ones tested. The speakers in the study heard TV dialogue, not a family kitchen. Factors such as background noise and distance from the device are outside the TV-audio figures above.

Two patterns are worth watching in your own home. The first is a device that wakes during TV or radio that contains phrases close to its wake word. The second is a device that wakes when no one is talking to it at night. Either may point to a setting or placement change.

What to do

1. Check the assistant's recording history. Amazon says transcripts of Alexa requests remain available for 30 days before it begins deleting them automatically ⁵.
2. Turn on automatic deletion of voice recordings. Amazon says you can keep saving recordings and have them deleted on an ongoing three-month or 18-month basis ⁶.
3. Move the device away from the TV or radio, or switch off the device in rooms where private talk happens.
4. If you want a dictation tool that does not send your speech to a server, choose one that processes it on your computer. Yap, which we make, is an on-device dictation app for Mac and Windows. For the term, see online speech recognition.

For how these events lead to human review, read our guide to human review of voice recordings. For the lawsuit that centered on false accepts, see what the Google Assistant recording lawsuit was about, and for the wider privacy question, see whether your phone is listening to you for ads.

For the full subject, see our overview of voice privacy.