iPhone Screenshots


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 help@knocktounlock.com and we'll get back to you within a day.

What’s New

Version 2.0.2

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

Ratings and Reviews

2.4 out of 5
10 Ratings

10 Ratings

sweetchilliphil ,

Works like a charm!

Works with no problems for me! No lag or huge delays. Once I wake my screen the app connects almost straight away. Incredibly convenient and always impresses my friends.

The only downside is the app. Every so often it loses its nut and tries searching for my computer, I can see the location access icon on my status bar appear and my iPhone heats up like crazy, draining my batteries in moments. It's incredibly annoying, and I've been forced to stop using the app because of the battery drainage it causes when it tries looking for my computer randomly.

But when it does work, it's fine. The app doesn't drain the batteries a lot and the ability to unlock is pretty much instant.

Kaostheory ,

Great App, Great Support from the developer

I LOVE this app. Simple to use, speeds up my day and never fails to impress people when I use it at work. Had an issue connecting after the Sierra GM update - but the developer sent me detailed instructions on how to fix it (under 24 hours from when I sent the distress flare) and it works like a charm again. Well worth the money so buy with confidence. Running on a 2012 MacBook Pro with Retina Display / iPhone 6s+ / Apple Watch Series 1 Aluminium.

DavidDownUnder ,

Excellent, works well

Very convenient and so far has been absolutely reliable.

Thinking of setting my Mac password to something longer and more difficult as I'll only rarely need to enter it now that I have this app.


Knock Software, Inc
12 MB

Requires iOS 7.0 or later. Compatible with iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6S, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max, iPhone XR, iPad Wi-Fi (3rd generation), iPad (3rd generation) Wi‑Fi + Cellular, iPad Wi-Fi (4th generation), iPad (4th generation) Wi‑Fi + Cellular, 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, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, 12.9-inch iPad Pro, 12.9-inch iPad Pro Wi-Fi + Cellular, iPad Pro (9.7-inch), iPad Pro (9.7-inch) Wi‑Fi + Cellular, iPad Wi-Fi (5th generation), iPad (5th generation) Wi‑Fi + Cellular, iPad Pro (12.9-inch) (2nd generation), iPad Pro (12.9‑inch) (2nd generation) Wi‑Fi + Cellular, iPad Pro (10.5-inch), iPad Pro (10.5-inch) Wi‑Fi + Cellular, iPad (6th generation), iPad Wi-Fi + Cellular (6th generation), iPad Pro (11-inch), iPad Pro (11-inch) Wi-Fi + Cellular, iPad Pro (12.9-inch), iPad Pro (12.9-inch) Wi‑Fi + Cellular, iPad mini (5th generation), iPad mini (5th generation) Wi-Fi + Cellular, iPad Air (3rd generation), iPad Air (3rd generation) Wi-Fi + Cellular and iPod touch.



Age Rating
Rated 4+
©Knock Software, Inc.


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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