SitCoach vs SitSense: Two Free Browser Posture Trackers, Compared

Both use MediaPipe, and both describe near-identical privacy handling. SitCoach states its frames are processed locally, never uploaded, stored, or sold, and that "your face never goes online — not to us, not to anyone"; even its own site analytics are cookieless and explicitly don’t receive camera data. SitSense’s browser surfaces work the same way — pose estimation runs client-side, and only numeric metrics, never video, ever reach a server.

Between these two specifically, privacy is not the differentiator. What differs is what each one does with the reading once it has it.

SitCoach’s privacy policy states plainly that nothing is saved, ever — no account, no history, no server-side record of anything. That is a genuine, deliberate design choice, and it is also a real limitation: close the tab and whatever it told you today is gone. There is no trend and nothing to compare against next week.

SitSense splits this in two rather than picking one side. The Chrome extension works like SitCoach — no account, real-time only, nothing saved — for anyone who wants exactly that. The web app is the opposite bet: a free account lets a companion you hatch remember your reef between sessions, and Pro opens every session you’ve ever logged rather than only the most recent one. Which of these you want depends on whether "nothing saved, ever" sounds like privacy to you, or like losing your own data.

SitCoach doesn’t show degrees or named angles — a tab icon shifts between green, orange, and red, and one browser notification fires if you stay in the red long enough. By its own comparison post, it deliberately skips streaks and gamification.

SitSense’s web app goes the other way: seven angles, each named individually — neck angle, craniovertebral angle, trunk angle, shoulder slope, forward head position, head tilt, neck rotation — so when something’s off, you’re told which joint moved rather than just that something changed. The free extension, the more directly comparable no-account tool, reports six of those seven in real time — everything except trunk angle.