The best posture app for Mac.

Mac has a couple of webcam posture apps — Nekoze is a free menu-bar nudge, Posture Reminder AI is a $99/yr app. StopSlouching takes a different route: it runs in your browseron macOS, so there's nothing to install, and it coaches you with a guided stretch instead of just a nudge.

Short version: open the free demo in Chrome, Edge, Arc or Brave, grant camera access, calibrate, and slouch on purpose to see the reminder. It takes about a minute, with no account needed. Pro keeps detection running after the demo.

Why webcam beats a reminder timer on Mac

macOS Focus modes and the usual break-timer apps fire on a schedule — every 30 minutes whether you're sitting well or not — so you learn to dismiss them. A webcam coach only interrupts when your posture actuallydrifts below your own calibrated baseline. That's real-time biofeedback, the same mechanism physical therapists use, and it's what makes the habit stick.

StopSlouching does it entirely on your Mac — the webcam feed is processed locally by an on-device AI model and never uploaded. You can confirm it yourself: open DevTools → Network while it runs and watch for frame uploads. There are none.

What you get on Mac

• A real-time 0–100 posture score, broken into head, shoulder and uprightness sub-scores.
• A targeted 30-second stretch when you slouch — chosen for whichever sub-score is weakest, not a generic reminder.
• Cross-tab coverage via the Chrome extension, so the coach follows you around the browser.
• A free live demo to start — see it catch a slouch in under a minute, no card — then Pro for unlimited use, with a 14-day money-back guarantee.

Comparing options? See the full posture-app roundup, StopSlouching vs Nekoze, or the complete guide to fixing your posture.