Systems, methods, and tools for proofing computer-aided design (CAD) objects (e.g., CAD drawings or models). The objects are implemented with CAD software and represent an apparatus. An exemplary method includes receiving a CAD object representing the apparatus, determining criteria for proofing the CAD object, determining rules, extracting items of interest from the CAD object, and comparing the extracted items with the rules. An example item of interest is a drawing note on the CAD object and an example rule includes a plurality of keywords.