Cal AI

Cal AI is a mobile app that estimates calories and macros from a single photo of your meal using AI vision, popular with fitness and weight-loss communities. It went viral on Xiaohongshu as an 'AI减肥神器,' with creators posting before/after food scans and weight-loss journeys. The app was built by a small team using AI-assisted development and on-device/cloud vision models. Its simple photo-in, numbers-out UX drove massive organic sharing. （小红书热度：小红书'AI减肥/热量扫描'爆款，减肥博主集中种草）