If you completely buy in to apples ecosystem it is really quite nice. I just got the Apple Watch and use it to unlock my MacBook. I know there are phone apps fo

If you completely buy in to apples ecosystem it is really quite nice. I just got the Apple Watch and use it to unlock my MacBook. I know there are phone apps for this and it's not unique to apple but the Apple Watch implementation works perfectly. It waits until you wake up the screen and gives you feedback on the watch in case you're in range but not at the computer. After purchasing the iPhone in 2007 I switched to Mac. I now use Mac windows and Linux but all on Mac hardware. I guess the iPhone was the gateway drug for me.