A new open-source macOS app called Posturr uses your Mac's camera and Apple's Vision framework to monitor posture in real-time. When it detects slouching, it applies a progressive screen blur as a visual reminder to sit up straight. The blur clears instantly once you correct your posture.

The tool runs entirely locally for privacy, processing video data on-device without sending anything to external servers. It offers menu bar controls for calibration and sensitivity, supports multiple displays, and requires no account. Its lightweight design uses minimal system resources while working in the background.

Posturr requires macOS 13.0 (Ventura) or later and camera access. Since it's not code-signed, users must manually bypass Gatekeeper on first launch. Built by Thomas Johnell, it addresses a common need for better ergonomics during long coding sessions, offering a simple, automated nudge for posture correction.