Protocols for culturing cardiac cells derived from human-induced pluripotent stem cells (hiPSCs) are critical for studying mechanisms of development and disease. This study provides data-driven analysis of a community-oriented database to assess parameters used in published cardiac differentiation protocols, including a web-accessible portal for user-guided customization of protocols. Validation studies support context-dependent roles for media composition in deriving functional maturation of hiPSC-derived cardiomyocytes.