Sit Up Straight at Mac App Store analyse

Sit Up Straight helps you to maintain a proper posture while working on computer. If you start to slouch, an overlay with sound notification will remind you to correct your posture.

The app uses computers camera to set up and assess your posture. Once you set up a "baseline" posture, the app analyzes your posture and displays it in the form of a stick figure in menu bar.
You can score your posture over time keeping track of your success.

With three different modes available, you can choose between:
Live - The camera constantly tracks your posture over time,
Custom Intervals - The camera analyzes your posture at predefined time intervals (e.g. every 2 minutes),
Manual - Posture check is triggered manually with a system wide shortcut or from the menu bar.

Sit Up Straight can be disabled or paused at any time and there are various settings to customize the app.