The 'Structure Assessment' web server is a comprehensive platform designed for the interactive evaluation and benchmarking of structural models of macromolecular complexes, including proteins and nucleic acids. It integrates various state-of-the-art tools to facilitate the visual exploration and evaluation of structure models. The user-friendly web dashboard links sequence information with structural data, providing access to stereochemistry information, secondary structure details, global and local model quality assessments, and membrane location predictions. Additionally, a benchmarking mode allows users to compare models against reference structures, offering scores similar to those used in recent CASP experiments and CAMEO. The server is highly extensible and can handle a wide range of structural models, from experimental data to deep-learning-based predictions. It is integrated within SWISS-MODEL and has been regularly updated since its initial release, with over 600 structures assessed daily. The server is freely accessible at <https://swissmodel.expasy.org/assess>.The 'Structure Assessment' web server is a comprehensive platform designed for the interactive evaluation and benchmarking of structural models of macromolecular complexes, including proteins and nucleic acids. It integrates various state-of-the-art tools to facilitate the visual exploration and evaluation of structure models. The user-friendly web dashboard links sequence information with structural data, providing access to stereochemistry information, secondary structure details, global and local model quality assessments, and membrane location predictions. Additionally, a benchmarking mode allows users to compare models against reference structures, offering scores similar to those used in recent CASP experiments and CAMEO. The server is highly extensible and can handle a wide range of structural models, from experimental data to deep-learning-based predictions. It is integrated within SWISS-MODEL and has been regularly updated since its initial release, with over 600 structures assessed daily. The server is freely accessible at <https://swissmodel.expasy.org/assess>.