Constructed international auxiliary languages (IALs) have been proposed to influence the cultural identities and world perspectives of their speakers. The creation of IALs surged in the late 19th century as a response to rising nationalism; through their sociopolitical neutrality and ease of learning, IALs sought to introduce unity to a divided world. Though IAL adoption remains limited, their speakers still believe that given the ability to spread, IALs could unite our global community. To examine group trends and individual perspectives in how IALs may influence identity and perception, I surveyed and interviewed an online Esperantist community. I also performed close reading of randomly-selected posts on online forums for Esperanto, Volapük, and Toki Pona, as well as the general forum Linguistics and Conlangs. Finally, I analyzed content for six months of posts from the Volapük and Toki Pona forums. Most speakers (68.8%) self-reported that IALs changed their perception and, fewer (34.4%), beliefs. Survey respondents and interviewees cited community membership, broader communication, and IALs’ simplified linguistic features as influences on their worldviews. Accordingly, more years speaking Esperanto, seeking and feeling part of Esperanto communities, and believing the world would be a better place with more IAL adoption significantly correlated with change in beliefs. Different IAL forums statistically differed in their content, interactivity, and post length, which may reflect language-influenced disparities. The results suggest that IALs may affect the beliefs of learners in relation to their community-building properties and widening of communication ranges and impact the perceptions of learners through their unique structures.