EBF3PanelOpt: An optimization framework for curvilinear blade-stiffened panels. Highlights: An optimization framework for flat/curved blade-stiffened panel is created. Curvature, orientation, thickness and height of the stiffeners are design variables. Different constraint aggregation strategies for multiple load-cases are provided. Panel thickness can be uniform or non-uniform pocket thickness of the panel. Optimal panel has higher order buckling mode shape and von Mises stress is higher.