One interesting app I found was https://apps.apple.com/us/app/posture-pal-improve-alert/id1590316152 https://apps.apple.com/us/app/posture-pal-improve-alert/id1

One interesting app I found was https://apps.apple.com/us/app/posture-pal-improve-alert/id1590316152 https://apps.apple.com/us/app/posture-pal-improve-alert/id15... It detects posture via Airpods and tries to correct you.