Circular platforms, digital business models designed to prioritize circular economy principles, are transforming how we approach sustainability. In an era where digital platforms and environmental consciousness are reshaping markets, circular platforms are striving to survive and success. This study investigates the organizational features that enable circular platforms to balance digital transformation and sustainability. Employing a qualitative multiple case study approach, it examines 28 circular platforms across various industries and geographical locations. The analysis identifies interaction complexity and organizational integration as important dimensions for balancing digital transformation and sustainability, proposing a framework which categorizes platforms into B2B, B2C, C2B, and C2C models. Key challenges linked with digital transformation include market penetration, logistics, and regulatory barriers, while benefits encompass enhanced transparency and resource optimization. The proposed framework provides a first step to the categorization of circular platforms and its key managerial implications.