The website is up and running at http://stickerkadai.github.io. An android app for the same is under development.
The code is licensed under GNU GPL V3 license and the stickers are licensed under CC-BY-SA license. You can find the source of the site at https://github.com/stickerkadai/stickerkadai.github.io.
Suggestions are welcome. If you need custom stickers, you can mail to us at email@example.com.