Knock Knock is contact sharing app which aims to remove the awkwardness in asking for the contact of a person you just met in a party or school . One can initiate contact sharing by knocking twice on the phone(assuming that the other person you want to share your contact with has the app already). This gesture brings up the knock knock app , even when the screen is locked.This app uses the phone’s accelerometer and gyroscope to enable that gesture even when locked.On the app, you can see only the people who have Knock Knock installed and who are within Bluetooth range. You can tap the person and they will get a knock notification on their phone. From there, they can either choose to connect with you or not, and you can also select just what information about yourself you want to share.
Once that other person knocks back, they’ll be automatically connected to you on all the relevant social channels — Facebook, Twitter, Instagram and so forth — as long as they agree to it. If you’d rather not share anything, but you still want to chat, you can just chat through the app itself. It will instantly note when and where you met, so that it’s easier to remember who that person is on your contacts list.