You can play Okey directly in your web browser at Game Finale with no download required.

Just open the site, sign in, and join a table to be matched with real players or smart bots. The browser version runs on desktop and mobile browsers, and your account and chips sync across devices, so you can switch between phone and computer. An Android app is on Google Play, and iOS is on the way. Everything uses virtual chips, so it is free to start playing right away.