This study introduces the NUD-GESI platform, a customized social media simulation to encourage Gender Equality and Social Inclusion (GESI) in the sociocultural context in Qatar. Built on top of the Gorilla Text Builder, it is used to manipulate text stimuli in real-time in environments similar to popular ones, including support for the Arabic language and culturally appropriate filters. Grounded in behavioral science, the platform incorporates co-designed digital nudges such as framing effects and social proof to promote prosocial, inclusive interactions between Arab youth. Its has its scalable, cloud-based infrastructure to support large-scale controlled experiments, pushing the research on digital behaviors and inclusion in society. By bringing together technology and behavioral insights, NUD-GESI provides policymakers, researchers and social media platforms with a powerful tool to harness the power of digital interventions in order to achieve positive social outcomes across different cultural contexts.