The adoption of digital technologies is transforming data collection in official statistics, creating new opportunities to enhance efficiency and data quality. The Italian National Institute of Statistics (Istat) is exploring the use of mobile applications for the Household Budget Survey (HBS), which has traditionally relied on a paper diary to track household expenditures. This transition aims to reduce transcription errors, improve user engagement, and streamline the data collection process. The study consists of two main phases: (i) a review of international experiences, particularly projects funded by Eurostat and (ii) an analysis of respondents’ feedback from the 2022 and 2023 survey editions. Findings suggest that a mobile app could effectively simplify diary completion, with features such as automatic expense categorization. However, challenges remain, particularly regarding digital accessibility and privacy, which require technical and methodological solutions. The analysis of participant feedback highlights five key priorities: (i) digitalizing the diary; (ii) simplifying the user interface; (iii) providing advance notifications; (iv) strengthening privacy protections; (v) offering participation incentives. Based on this evidence, the study proposes the development of an intuitive and accessible mobile app that incorporates user support tools and enables multi-platform access.