tracking.js is a new library that intends to bring the power of computer vision to the Web. OpenCV is far older and is a inspiration for our team regarding the number of available algorithms, robustness and speed. With the increasing power of JavaScript engines, we believe that we can achieve very good results using current state-of-the-art algorithms and low-level optimizations, so real-time CV applications can also be done on the Web. Currently tracking.js don't have as many algorithms as OpenCV, but we are making our best efforts to bring useful algorithms to the library while still keeping the API easy to use and to extend, so we can count on the community to help us to make this project a success.