StreetViewAI is the first accessible Street View tool for people with visual impairments. Existing interactive streetscape mapping tools like Google Street View (GSV) and Meta Mapillary allow users to virtually explore and experience real-world environments through immersive 360-degree imagery, but are fundamentally inaccessible to people with visual impairments. StreetViewAI solves this problem by combining context-aware multimodal AI, accessible navigation controls, and interactive voice. Blind users can virtually explore GSV's distributed collection of over 220 billion images and over 100 countries, explore destinations in detail, and plan remote routes. StreetViewAI's usability was proven through an iterative design process with a mixed-vision team and evaluations with 11 blind users.