Purpur

Professional online eGFR (glomerular filtration rate) calculation tool

Mobile Dou Dizhu card tracker using image recognition to show unplayed cards, so you can easily tell if there are still bombs left outside. Perfect for private game rooms, supports multiple platforms.

A must-have for anyone who sits for long periods and constantly looks down at screens, to help protect your cervical spine health.

A social self-discipline app for two-person early clock-ins to win cash prizes.