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Knock – unlock your Mac without a password using your iPhone

By Knock Software, Inc

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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

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Customer Reviews

Much improved of late!

I’m finding Knock to connect much faster and more reliably. I sometimes go days without manually typing my password on my mac now. I also love the new feature to knock to enter admin password when the system requests it.

[original 3 star review]
When it connects quickly, I love it. Often, though, I could spend more time waiting for it to connect to my iPhone 5 than typing my password. I really like this app, and I’ll continue using it, but I often find that I’m surprised when it’s connected and working which is not a good sign. I’m hoping future technologies and some work by the developers will eventually allow this to work more seamlessly.

Bluetooth unreliable..

Too difficult to set up apps, doesn't connect when instructed to, have to try a bunch of times. Once connected only worked for a while but once a day passes it ceases to connect with Bluetooth. Sometimes the only thing that works and hardly even then, is resetting the phone. More trouble than it's worth. Not sure if it's because of the Bluetooth connectivity on the MacBook itself or something else. Also you don't have to knock on the phone, tapping the screen with your finger tip is enough.


Easy to set up, works as advertised, and now I don't ever have to type my password for my login screen again.

Gimmick? Yes. Amazing useful because you always keep your iPhone either around you or in your pocket? YES!

Would I recommend this to a friend? Yes $4 well spent, and I haven't bought an app in months. It's great to see technology increasing at the rate it is.

Knock – unlock your Mac without a password using your iPhone
View In iTunes
  • $3.99
  • Category: Utilities
  • Updated:
  • Version: 1.1
  • Size: 1.6 MB
  • 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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