iPhone Screenshots


Note: Knock does not currently support Mac OS X High Sierra.

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

This app has been updated by Apple to use the latest Apple signing certificate.

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

Ratings and Reviews

2.7 out of 5
12 Ratings

12 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.

Glenn_P ,

Works if you have the right equipment

I think the bad reviews are from people with older macs that don't support Bluetooth low energy.

It works for me.

But I wish it would pop up on the Apple Watch quicker.

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.

App Privacy

The developer, Knock Software, Inc, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

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

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