Opening the iTunes Store.If iTunes doesn't open, click the iTunes application icon in your Dock or on your Windows desktop.Progress Indicator
Opening the iBooks Store.If iBooks doesn't open, click the iBooks app in your Dock.Progress Indicator

iTunes is the world's easiest way to organize and add to your digital media collection.

We are unable to find iTunes on your computer. To buy and download Knock – unlock your Mac without a password using your iPhone by Knock Software, Inc, get iTunes now.

Already have iTunes? Click I Have iTunes to open it now.

I Have iTunes Free Download
iTunes for Mac + PC

Knock – unlock your Mac without a password using your iPhone

By Knock Software, Inc

Open iTunes to buy and download apps.


Faster and safer than typing a password, for iOS and Mac.

You keep your iPhone with you all the time. Now you can use it as a password. You never have to open the app— just knock on your phone twice, even when it’s in your pocket, and you're in.

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 1.1

- iPhone 6 and 6 Plus compatibility
- You can now lock your Mac with Knock. Just tap on your computer in the app, and it locks!
- Fixed a bug that could cause Knock to crash and become unresponsive
- Knock is now better at detecting knocks when it is lying flat
- Fixed a bug that could cause Knock to never get beyond the Bluetooth permission screen on iOS 8
- Reliability improvements

iPhone Screenshot

iPhone Screenshot 1
iPhone Screenshot 2
iPhone Screenshot 3
iPhone Screenshot 4

Customer Reviews

Great app!

It works perfectly, it’s very simple and minimalist to lock and unlock the Mac. I’m using it on a MacBook Pro (mid 2014) and an iPod Touch 5th Gen. I hope see in a near future the possibility to turn on my screen and unlock the computer just knocking my iPod. And replace the passwords that we use to log in into websites or applications, that would be very interesting.

Great, but...

The App is really good. Congrats to developers! I won't give 5 five stars because of:
1- the installation process was a mess. But I got it to work.
2- It won't unlock from Black Screen, which I would find an incredible feature.
3- I know this might be against the app itself, but knocking on your phone is kind of "weird". Besides, I have the feeling that, by knocking on my phone, I'd be either creating a dent on the back of the phone or break the glass by knocking on the front. It might be my first impression, but I really don't like doing this right now.
4- Last, but not least, I don't find it safe at all.. I rather have an App that uses TouchID for it...

I don't regret the purchase, I want to see how I'm going to get along with it, but I'm not convinced either...

Almost there!!!

I saw these guys win the PDX demolicious cup and since then have been very excited to try their app. I've been using knock for several weeks now and love it. The setup is easy and the app generally works well. There is infrequent connectivity issues that make this review 4 instead of 5 stars. I am using a 2012 mbp retina.

Knock – unlock your Mac without a password using your iPhone
View In iTunes
  • $3.99
  • Category: Utilities
  • Updated: Dec 07, 2014
  • Version: 1.1
  • Size: 1.6 MB
  • Language: English
  • Seller: Knock Software, Inc

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

Current Version:
All Versions: