Facial Recognition for your Laptop

I generally do not recommend software that you pay for.  There are so many free alternatives to almost every program, that very few paid programs are worth it.  However, with Key Lemon Gold, my mind has changed, at least this time.  Key Lemon Gold is a facial recognition program primarily for laptops.  Quite simply, you log on with your webcam.  It checks your face against your face and logs you on.  If someone else is sitting there, they are locked out.  It also checks your face at different preset times and when your system comes out of sleep.  It currently goes for $29.95, although I got it on a one day sale for $5.99 a couple of weeks ago.