Knock, a newly released app for both iOS and Mac, is designed to allow users to unlock their Macs via Bluetooth with an iPhone, replacing traditional password logins.

After downloading the Knock app for iOS and the accompanying app for the Mac, an iPhone can unlock a connected Mac with two knocks on the back of the iPhone. The iOS app pairs specifically with the Mac app, which creates a secure connection between the two, and the process does not require opening the Knock app.

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.

Because it uses Low Energy Bluetooth 4.0, Knock is compatible with the iPhone 4s or newer, along with the 2011 MacBook Air or newer, the 2012 MacBook Pro or newer, the 2012 iMac or newer, the 2011 Mac mini or newer and the 2013 Mac Pro.

Knock for iOS can be downloaded from the App Store for $3.99 [Direct Link]. The accompanying Mac app can be downloaded from the Knock website for free.

Top Rated Comments

Reason077 Avatar
157 months ago
And if your iPhone breaks somehow, how do you access your mac then?
Due to the advanced security, it's impossible. You need to buy a new Mac.
Score: 33 Votes (Like | Disagree)
0160033 Avatar
157 months ago
Broken iPhone incoming.

Hey don't Knock it till you try it
Score: 28 Votes (Like | Disagree)
3bs Avatar
157 months ago
And if your iPhone breaks somehow, how do you access your mac then?

Just type in the password?
Score: 15 Votes (Like | Disagree)
Reason077 Avatar
157 months ago
The guy in the video looks like a giant douche with his silly beard. I'd like to "knock" him. In the face.
Score: 15 Votes (Like | Disagree)
unplugme71 Avatar
157 months ago
My iPhone has a cracked screen. I knocked. Cut my hand. Bleeding

Just called my lawyer..
Score: 14 Votes (Like | Disagree)
3bs Avatar
157 months ago
'Knock' iOS App Uses Bluetooth 4.0 to Replace Password Unlocking on Macs

Just make sure you remember to knock the back of your iPhone!

Unless you have a naked iPhone 4S, that is. Given how easily I've seen the backs of iPhone 4/4S break, knocking it anywhere is probably best avoided.
I think you're exaggerating. They said knock, not punch :p

Sure drops might break it but simply knocking can't possibly break the back unless there was already serious structural damage.
Score: 9 Votes (Like | Disagree)

Popular Stories

Apple Logo Spotlight

Report: Apple to Launch These New Products in 2026

Sunday November 2, 2025 5:34 am PST by
Apple is planning to launch at least 15 new products in 2026, according to Bloomberg's Mark Gurman. Gurman outlined what to expect from Apple in 2026 in the latest edition of his "Power On" newsletter. He said the company is heading "into one of its most pivotal years in recent memory," with the rollout of major new Apple Intelligence features, intense regulatory pressure on the App Store,...
Apple Intelligence General Feature 2

New Version of Siri to 'Lean' on Google Gemini

Sunday November 2, 2025 6:06 am PST by
In his "Power On" newsletter, Bloomberg's Mark Gurman today provided an update on the status of Apple Intelligence and the plans for it in 2026. Apple is still planning to roll out its revamped version of Siri around March of next year. The release should be accompanied by the release of a new smart home display product with speaker-base and wall-mount options. A new Apple TV and HomePod...
HomePod mini and Apple TV

New Apple TV and HomePod Mini Likely Launching Soon

Sunday November 2, 2025 5:49 am PST by
A new Apple TV and HomePod mini could launch as soon as this month, Bloomberg's Mark Gurman today suggested. In today's "Power On" newsletter, Gurman said that Apple retail stores are planning an overnight refresh on the evening of November 11, where changes will be made after closing, such as refreshing displays and placing new products for the following day. The timing of the overnight...
iOS 26

Apple Releases iOS 26.1 With Liquid Glass Toggle, Slide to Stop Alarm, New Apple Intelligence Languages and More

Monday November 3, 2025 1:11 pm PST by
Apple today released iOS 26.1, the first major update to the iOS 26 operating system that came out in September, iOS 26.1 comes over a month after iOS 26 launched. ‌iOS 26‌.1 is compatible with the ‌iPhone‌ 11 series and later, as well as the second-generation ‌iPhone‌ SE. The new software can be downloaded on eligible iPhones over-the-air by going to Settings > General >...
iOS 26

iOS 26.1 Available Now With These 8 New Features

Monday November 3, 2025 5:54 am PST by
Following more than a month of beta testing, Apple released iOS 26.1 on Monday, November 3. The update includes a handful of new features and changes, including the ability to adjust the look of Liquid Glass and more. Below, we outline iOS 26.1's key new features. Liquid Glass Toggle iOS 26.1 lets you choose your preferred look for Liquid Glass. In the Settings app, under Display...
Early Black Friday Deals 2

The Best Early Black Friday Apple Deals

Sunday November 2, 2025 10:04 am PST by
We're officially in the month of Black Friday, which will take place on Friday, November 28 in 2025. As always, this will be the best time of the year to shop for great deals, including popular Apple products like AirPods, iPad, Apple Watch, and more. In this article, the majority of the discounts will be found on Amazon. Note: MacRumors is an affiliate partner with some of these vendors. When ...
apple one  cpqesecbv342 upscaled feature

Apple One Gets New Colorful Logo Following Apple TV Rebrand [Updated]

Monday November 3, 2025 3:22 pm PST by
Apple updated the logo and name for its Apple TV streaming service today, and it looks like Apple One might be next. On the revamped Apple TV website, there's a new, more colorful Apple One logo available. The logo features an Apple icon that's split into six slices, and each slice includes the color that Apple uses for one of the services included in Apple One Premium. Apple One is...