The recent research in the field of digital applications for vulnerable populations has shown a significant focus on enhancing security, privacy, and usability, particularly for older adults and individuals with hearing impairments. Innovations in e-payment systems are being tailored to meet the specific needs of older adults, emphasizing traditional authentication methods over complex multi-factor authentication, reflecting a shift towards more inclusive design practices. In the realm of online dating, there is a growing recognition of the unique challenges faced by deaf or hard of hearing individuals, leading to the development of more accessible and community-based platforms that facilitate deeper, more authentic connections. Additionally, the understanding and perception of biometric authentication methods are being critically assessed to address user misconceptions and improve the design of future interfaces. Lastly, there is a notable trend towards co-creation and user-centered design in therapeutic applications, exemplified by the development of an app to support reminiscence therapy for older adults with dementia, which has shown promising results in enhancing the effectiveness and usability of such interventions.