PreveCan, an app for cancer prevention based on the 2018 WCRF/AICR guidelines: development and usability

PreveCan is a useful tool to inform Spanish-speaking users on lifestyle changes to reduce cancer risk by assessing adherence to WCRF/AICR cancer prevention guidelines. The app was developed using a user-centred design approach involving epidemiology, medical, nutrition and software design experts and public. PreveCan educates users on WCRF/AICR recommendations rating their adherence from 1 (poor) to 5 (excellent), offering advice for improvement and

evidence-based additional information on the relationship between lifestyles and cancer. General usability of PreveCan was rated highly, with a median score of 94/100 (IQR: 85-99). Ease of use and satisfaction scored 39/40 (IQR: 35-40), with 87% of users rating all items ≥4 points.  Common feedback highlighted the need for a standardized response format and stronger incentives to encourage regular use. Based on this, PreveCan was updated and is freely available on Google Play and the Apple Store.