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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 2.0.2

- Fixes a bug that could cause Knock to fail to connect when your Mac is locked.

iPhone Screenshot

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Apple Watch

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Customer Reviews

Such a Shame

I really wanted to like this product, as it seemed like a great idea. The problem is if your Mac has been asleep for a while, you can “knock” on the app until your hand fell off, and it won’t do anything. Also, I found them to be VERY misleading in how they showed how this worked. They showed a guy on their website just knocking on his phone WHILE IT WAS IN HIS POCKET mind you, and the computer magically turns on. What they DON’T tell you is that while that sure looked great, you would have to take your phone out, open it, get the app open, then put it back in your pocket with the screen still on, THEN you can do that trick. Not quite as simple as just walk up to your computer, tap your phone, and your computer unlocks. They SURE presented it that way. Pretty blatantly misleading if you ask me.

Excellent Tech Support

I have a password that is long enough to be useful and find Knock a great time saver. Recently I’ve experienced very slow detection of the Knock app when waking the computer. I contacted Knock tech support and am delighted that they reviewed several files from my computer that helped them to track the problem and gave advice that really helps.

Used to work, but now never

The concept of Knock is great. When I first got it, it worked maybe 60% of the time, but it’s been on downward slope ever since. Now it doesn’t work it all. It has never ever worked from my Apple Watch. I don’t know whether the software has gotten buggy, iOS has gotten more restrictive, or Bluetooth is just too flaky to be reliable. Whatever the cause, Knock never activates at all now. So I’m still entering my password manually and have basically given up on Knock.

Knock – unlock your Mac without a password using your iPhone and Apple Watch
View In iTunes
Offers Apple Watch App for iPhone
  • $4.99
  • Category: Utilities
  • Updated:
  • Version: 2.0.2
  • 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.

Customer Ratings

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