SitSense is an AI-powered posture tracker and coach that uses your webcam to analyze posture in real time — no wearable devices, hardware, or app downloads required. Built on Google's MediaPipe computer vision framework, SitSense tracks 7 core posture metrics including forward head posture (tech neck), neck angle, trunk alignment, and shoulder slope, delivering instant feedback and coaching directly in your browser. Designed for remote workers, software engineers, students, and anyone who spends long hours at a desk, SitSense detects the subtle alignment changes that cause neck pain, back tension, and mental fatigue — and corrects them before discomfort builds. Analysis of 540+ hours of real user posture data shows most strain begins with small shifts that go unnoticed without real-time tracking. Unlike wearable posture correctors like Upright GO 2 or the discontinued Lumo Lift, SitSense analyzes full upper-body posture through your existing webcam with over 90% accuracy. All video processing happens locally on your device — no video is ever recorded, stored, or transmitted. Features include real-time posture scoring, personalized AI coaching, streaks, leaderboards, daily goals, and session analytics. Works on Chrome, Firefox, Safari, and Edge on Windows, macOS, and Linux. Free 3-day trial, then $34.99/year.