Everyone wants to replace the password with something better. Well, we already have smartphones — and some of us even have smartwatches. These tools can log you into your computer with a smartphone or smartwatch.



The best, most polished options are available for Mac users with iPhones. Solutions available for Windows and other platforms are much more limited.
iphone and macbook
Mac and iPhone or Apple Watch

Mac users with iPhones have the most — and most polished — options available:
Knock allows you to use either an iPhone or Apple Watch to unlock your Mac. Walk up to your Mac with your iPhone on you and it will communicate with your Mac using Bluetooth Low Energy. Knock on your phone’s screen — even if it’s just in your pocket, knock on your pocket — and it will unlock your Mac. There’s no need to even pull your phone out of your pocket, much less turn its screen on.
There’s now a Knock Apple Watch app for unlocking your Mac, which provides some good security — if someone puts your watch on, they won’t be able to authenticate and unlock your Mac. If someone grabs your phone and you’ve set up Knock, however, they’ll be able to log into your Mac unless you remotely disable Knock.
Knock costs $3.99 for the iPhone app. You’ll also need the Mac app installed on your Mac — that’s available for free.

Tether works entirely using Bluetooth Low Energy. Walk up to your Mac and your iPhone and Mac will establish a connection. Tether will automatically unlock your Mac when you approach. Walk away from your Mac with your iPhone on you and Tether will notice the iPhone is no longer in close proximity, automatically locking your Mac for you.
There’s now a Tether Apple Watch app, too. One concern with this solution is security — if you’re nearby your Mac in the same area, it will automatically be unlocked. If someone grabs your phone, they can approach your Mac and have it automatically unlock for them. It’s up to you whether this is good enough security for your needs.
The Tether apps for both iPhone and Mac are free. Tether offers in-app purchases for additional functionality, but the standard auto-unlock and auto-lock features are free. ( keep reading: http://www.techdavids.com/2017/01/how-to-unlock-your-computer-with-your.html?m=1#.WruK9b0o_qA

this will be nice but who realllywant s to try it....people are too busy fighting for money than thinking of....