We selected ∼230 structures with diverse chemical environments from the experimental structures in the computation-ready (CoRE-)MOF database, experimental covalent organic frameworks (CURATED-COFs), and the experimental all-silica zeolites in IZA database. The DFT predicted heat capacity of these structures are shown in Figure . The gravimetric heat capacity of the materials range from 0.4 to 1.1 J.g -1 .K -1 .