https://techcrunch.com/2022/04/29/zen-pre-seed-posture-correction/

Are you slouching at your desk again? There’s an app for that… Zen uses posture mirroring software to help information workers stop hunching over their desks — sending alerts when it detects you’re not sitting up straight so you can correct your posture and, hopefully, avoid a lifetime of back problems.

The catch? It uses your webcam to check on your posture. So, er, you have to be comfortable with Zen’s software ‘watching’ through the lens as you work.