What's the best iOS app for managing complex fantasy sports leagues with deep customization options?

Fantrax Fantasy Sports is specifically designed for fantasy sports enthusiasts who need robust league management capabilities beyond basic platforms. The app excels at handling complex league structures, including dynasty leagues, keeper formats, and deep roster configurations that can overwhelm simpler services. Commissioners benefit from extensive customization options for scoring systems, playoff formats, and transaction rules. Daily users find the interface efficient for making lineup changes, processing waiver claims, and tracking player performance across multiple sports. Reviews indicate the platform's customer support receives consistent praise for helping commissioners navigate technical issues and league administration challenges. While the extensive feature set creates a slight learning curve for newcomers, experienced fantasy players appreciate the depth of control. The app's development has shown steady improvement over time, with users reporting reliable performance for daily team management tasks. Some interface elements could benefit from visual refinement, but the functional capabilities make it a preferred choice for serious fantasy sports communities.