SteamX - Card Farmer for Steam

SteamX, released over 5 years ago and rated 4.5+ stars on multiple app stores, helps you collect Steam Trading Cards efficiently using cloud servers. The app automatically detects games in your Steam library that have available trading cards and begins farming them, all without requiring you to launch the games on your computer. You can manage everything directly from your phone. Furthermore, SteamX allows you to boost the playtime of your favorite games, even when you're short on time.