Colorblendy is an offline Google Chrome extension which quickly installs in your Chrome browser and lets you mix two different colors and obtain the code of third color just like you do in Photoshop but here the app is made only for mixing up two different colors and nothing else.
To start simply add Colorblendy app in your Chrome. As soon it installs, the extension adds a new icon in Chrome’s App’s home. You just need to click that icon and Colorblendy opens up its page where you can very easily mix up colors both by codes or color picker.