StreetNav reimagines navigation through an accessibility lens for people with reduced mobility. It's the first GPS designed specifically for this community, using a collaborative model where users report obstacles in real-time. Unlike static navigation apps, StreetNav generates personalized itineraries based on specific mobility profiles and constantly evolving conditions. The system highlights accessibility features while avoiding barriers, creating a living map that grows more useful with each user interaction. Since its launch in June 2024, the app has delivered exceptional impact: 40,000+ active users monthly, 50,000+ reported obstacles in the database, 500,000+ real-time itineraries generated, and 50 additional outing days yearly for people with reduced mobility. Seven Parisian districts now use StreetNav data to prioritize accessibility improvements, and the platform has expanded to Monaco with three additional European cities scheduled for 2025.