NeckCure

NeckCure is a Windows app that watches your posture through the webcam you already have and nudges you the moment you slouch.

What it does

• Side-view neck angle measured against your own baseline, not a textbook "correct posture"

• Front-view mode for laptops without a side camera

• The screen slowly dims when you ignore the reminder and brightens back once you sit up

• Blink counting and break reminders for screen-tired eyes (Pro)

• Daily posture score and statistics

Privacy: all the computer vision runs on your PC. No video or screenshots ever leave your machine.

The free plan covers posture detection. Pro is $3.99/month. Available on the Microsoft Store.