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Knock is a faster, safer way to sign in. 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.

What's New

Version 1.0.5: Release notes were unavailable when this listing was updated.


  • OS X 10.8 or later
  • Mac which supports Bluetooth Low Energy: 2011 MacBook Air or later, 2012 MacBook Pro or later, 2012 iMac or later, 2011 Mac mini or later, or 2013 Mac Pro
  • Knock for iPhone $3.99 on the iTunes Store
  • iPhone (4S, 5, 5C, or 5S) running iOS 7 or later

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Knock User Discussion

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Zephyris Member IconComment+189

If my display is asleep through energy saver will it still unlock?

Reply0 replies
Version 1.0.5
Fightingcat Member IconComment+78

Great to see when a fresh company totally ignoring that there are some people on this world who still have Mac's who are older than 2011. That's really innovative and I'm sure that Apple will love this.
Well, ok... I think it's something about the low power Bluetooth connection. So... Thanks for the idea, but can't use it on my "grandfather iMac" from 2007.

PS: I have hear that some iPhones and Macs using a special connection like WLAN and can be pared.

Reply2 replies
Version 1.0.5

WLAN sucks for this sort of thing for a lot of use cases.

Most of it boils down to things like this require zeroconf/bonjour or a static IP address to be configured on the device(s).

- Bonjour/zeroconf only work on the same logical network which often isn't the case for desktop Macs and their iPhones. e.g. my desktops are on ethernet and my iPhone is on WiFi.
- My iPhone is rarely/never on the same logical network as my desktops so bonjour won't work — this is why the Keynote Remote and iOS Remote app aren't usable for a lot of people too.
- Static IP addresses and configuration is fiddly and a pain to support when so many users will be WHAT IP HELP PLZ ???

Could use regular Bluetooth but then people would be raging because their battery is failing to last 8 hours.

So if you want to benefit from advances in current technology like low-power Bluetooth, you'll need gear that uses said technology.


Just wanted to add that yes small home networks are likely flat and wireless and wired devices are on the same logical network. That's a common deployment for small networks, but then you'd still have the battery life issue so it's kind of a moot point. WiFi requires more battery than Bluetooth and a lot more than Bluetooth Low Energy.

DJSquint Member IconReview+61

Now that is what I call a neat app. Tops

Reply0 replies
Version 1.0
Hmfwic Member IconComment+17

How can it say free at the top of the page, but $3.99 farther on down?

Reply1 reply
Version 1.0
Joel Mueller

The license pertains to the Mac app that is listed on MacUpdate. It is free. But the iOS app price is also mentioned in the Requirements part of the page.

SlyFly Member IconComment+9

Kind of a neat idea. I was kind of expecting it to be like the old days when you would only let someone in if they knew the secret knock.

Two taps seems too simple, though perhaps as basic knock combination its fine. But I'd be really excited if I could tap out a secret knock - similar to how ios7 allows for custom ring vibrations by tapping it out.

Reply0 replies
Version 1.0
Joel Mueller Member IconReview+119
Joel Mueller

Setup is really easy. You have to buy the iOS Knock app for $3.99 but once you launch both apps on your Mac and iPhone (with Bluetooth on) they recognize each other. Then you simply put your iPhone into lock mode and it does the rest for you.

Very cool and fun idea. Great job guys.

Reply0 replies
Version 1.0
user icon+0
Version 1.0.5
user icon+0
Version 1.0.5
> 5 4


Current Version (1.x)


Downloads 1,617
Version Downloads 1,134
Date 09 Nov 2013
Platform Intel 64 / OS X
Price Free
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