The keep scheme opens the keep shopping app, and directs you to a specific product, collection, or user
Application homepage: http://keep.com
iTunes link: https://itunes.apple.com/us/app/keep-shopping-shop-latest/id706213112
HTML Link example: http://keep.com/black-high-top-chuck-taylor-shoes-converse-shoes-conversecom-by-joe/k/pHM1uVgBP2/
Native application URL string example: keep://black-high-top-chuck-taylor-shoes-converse-shoes-conversecom-by-joe/k/pHM1uVgBP2/
Extended example: The keep app can open any keep, collection, or user by using the "keep://" scheme and appending the same HTTP resource locator used on the web. For instance to connect to the user located on the web at "http://keep.com/u/joe/" one must simply replace the "http://keep.com" with "keep://" to yield "keep://u/joe"