You can finally drive at 00 yawns / hour

Introducing YawnStop™
The anti-drowsiness app for Apple Watch

How YawnStop™ Works

YawnStop™ prevents drowsiness by sending subtle vibration pulses to your wrist at varying intervals through your Apple Watch. These keep your brain alert and attentive even on long, monotonous drives. Several studies have shown this technology is highly effective and reliable.

Set and forget

Just set your preferred vibration interval and press start. That's it!
YawnStop™ doesn't require any interaction when you're on the road.

Unexpected by design

The vibration pulses on your wrist are always unpredictable. This prevents your brain from getting familiar with the pattern.

Completely private

YawnStop™ doesn't collect your data and rest assured, it never will.

Versatile

YawnStop™ is also perfect for anywhere else you might feel drowsy: on shift work, in class, during late-night study sessions, in client meetings, and even in workshops and conferences.

Discreet

It's totally discreet when you activate Silent Mode on your Apple Watch. That way, it'll deliver vibration pulses without any audible beeps.

Now stop yawns for life
at the price of a coffee

YawnStop™ is a one-time purchase.

The app has no monthly subscriptions or annoying ads.
What's even better? It's now available at the price of a coffee.

Frequently Asked Questions

A few things to keep in mind

YawnStop™ is designed to help maintain alertness and does not guarantee drowsiness prevention. It is not a replacement for sleep. If you feel tired, pull over and rest. There is no substitute for the sleep your body needs.

Always start your YawnStop™ session before you begin driving. Do not interact with your Apple Watch while operating a vehicle.

By using YawnStop™, you acknowledge you are fully responsible for your own safety and the safety of others while driving. Use good judgement, drive responsibly, and take breaks when you need them.

What's on your mind?

Whether it's a question, a bit of feedback, or something we haven't thought of yet, drop us a line. We read everything and do our best to get back to you quickly.

© 2026 Callosum AI Inc.
All rights reserved.

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