This study investigates the application of Nielsen’s 10 usability heuristics in the design of digital Sustainable Product Development (SPD) tools using a participatory design approach. Participants included representatives from three companies and SPD experts from academia. During the workshops, the ten usability criteria were presented, after which participants engaged in a brainstorming session to generate practical recommendations for SPD tool design based on their professional experience. The results suggest that SPD practitioners consider these heuristics relevant for SPD tool development. Future research will evaluate the effectiveness of integrating these guidelines into the design process and ongoing improvements to SPD tools.