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Knock – unlock your Mac without a password using your iPhone and Apple Watch

By Knock Software, Inc

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Knock and Apple Watch: a match made in heaven. Knock 2.0 makes unlocking your Mac faster and more secure than ever.

You keep your iPhone with you all the time. Now you can use it as a password. You never even have to open the app— just knock on your phone twice, even when it’s in your pocket, and you're in. And if you have an Apple Watch, you can unlock your Mac right from your wrist.

Using Knock won't drain your iPhone's battery, even if you use it all day every day. Knock securely communicates with your Mac using Bluetooth Low Energy, a new technology that draws very little power.


Have a question? Email us at and we'll get back to you within a day.

What's New in Version 2.0.1

Bug fixes, people! Knock 2.0 had some bugs, and we are fixing them!

For the nitty gritty details, read on…

- Improved notification copy to make it more obvious that you can slide to the left to unlock your Mac right from the lock screen.
- Fixed a bug that could allow you to unlock your Mac by Knocking even when Touch to Unlock is enabled.
- Fixed a bug where Knock could show your Mac as locked when your Mac requests your admin password.
- Fixed a bug that could cause Knock for Apple Watch to incorrectly whether your Mac is unlocked or not.
- Fixed a bug where Knock for Apple Watch could show the wrong desktop picture for your Mac.

iPhone Screenshot

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Apple Watch

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Customer Reviews

2.0 is great.

Connectivity has been great! I find the watch glance extremely useful and often unlock my Mac as I walk towards it. Connects faster and more often than MacID in my experience.

I do not recommend this app

It hardly ever works. I'm having connectivity issues with my Apple Watch. There are several troubleshooting tips for the problem I'm having that even includes terminal commands. I don't have time to jump through a bunch of hoops just to get an app to work. It's much easier for me to type in my password. Not worth $5, IMO.

Great when it works. About 30% of the time

Overall this app takes more time with fruitless efforts to get it to work than it saves when it is functioning as expected. Opening the app does nothing -- no help menu, no anything.

Knock – unlock your Mac without a password using your iPhone and Apple Watch
View In iTunes
Works on Apple Watch with an iPhone
  • $4.99
  • Category: Utilities
  • Updated:
  • Version: 2.0.1
  • Size: 4.4 MB
  • Apple Watch: Yes
  • Language: English
  • Seller:

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Wi-Fi (3rd generation), iPad Wi-Fi + Cellular (3rd generation), iPad Wi-Fi (4th generation), iPad Wi-Fi + Cellular (4th generation), iPad mini Wi-Fi, iPad mini Wi-Fi + Cellular, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, and iPod touch. This app is optimized for iPhone 5, iPhone 6, and iPhone 6 Plus.

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