The NO3RR is a complex reaction network, with a diverse range of pH-dependent reaction pathways and products that range from dissolved molecules to ions to gasses . Drawing parallels to CO2 electroreduction (CO2RR), this results in specific concerns regarding mass transport and product detection. The NO3RR often proceeds at electrochemical potentials where the hydrogen evolution reaction (HER) from water is also possible, resulting in a competition between reactions for protons in solution (H + ) and on the surface (H*). This comment shares the rationale behind practices in NO3RR that enable the assessment of catalyst performance in ways that facilitate comparison. This is rooted in a brief summary of the important mechanistic aspects that necessitate specific practices for NO3RR and explain the limitations in comparing material performance. We highlight the diversity of possible feedstocks, their inherent complexities, and suggest common platforms for testing. This testing requires specific needs in reactor configuration and product analysis. We conclude with a critical assessment of what is required for accurate comparison of catalyst performance.