Spine Nudge

Privacy Policy

Last updated: July 10, 2026

Spine Nudge is a macOS app that coaches your seated posture. This policy explains what the app handles, what stays on your device, and what we can and cannot see. mercably, LLC makes Spine Nudge.

The short version

  • Spine Nudge reads AirPods head motion to estimate your posture. It does not use your camera.
  • Posture and motion are processed on your Mac. They are not sent to us.
  • Your streaks, stats, and settings sync through your own private iCloud account. We cannot read them.
  • There is no advertising, no behavioral tracking, and no third-party analytics inside the app.

Motion and posture data

To detect slouching, Spine Nudge uses the head-motion sensors in supported AirPods, the same signal that powers spatial audio. This data is processed on your Mac in real time to decide when to nudge you. The raw motion stream is not recorded, exported, or transmitted to mercably.

Streaks, stats, and settings (iCloud)

So your progress follows you across your own Apple devices, Spine Nudge stores your streaks, badges, Vitality score, and preferences in your private iCloud database using Apple CloudKit. This data lives in your Apple account. Apple provides the storage, and mercably has no access to it. Deleting the app or signing out of iCloud removes access to that synced data on that device; you can also delete it from within the app.

The waitlist

If you join the waitlist on this site, we store your email address so we can tell you when Spine Nudge is available. We use it only for that purpose. It is not sold or shared, and you can ask us to remove it at any time.

Diagnostics and crash reports

Spine Nudge does not embed third-party analytics or advertising SDKs. If Apple's standard crash and diagnostics reporting is enabled on your device, Apple may share anonymized crash information with us so we can fix bugs. You control that in your device settings, and it contains no posture or motion data.

What we do not do

  • We do not use a camera or microphone to watch you.
  • We do not build a profile of you or track you across apps or the web.
  • We do not sell or rent your personal information.
  • We do not use your data to train AI models.

Children

Spine Nudge is not directed at children under 16, and we do not knowingly collect personal information from children.

Your rights

Depending on where you live, you may have the right to access, correct, or delete the limited personal information we hold (such as a waitlist email). Because posture, motion, and progress data stay on your device and in your private iCloud, you already control them directly through the app and your Apple account. To make a request about anything we hold, email [email protected].

Changes to this policy

We may update this policy as the app evolves. When we do, we will change the date above and, for material changes, note it in the app or on this page.

Contact

Questions about privacy in Spine Nudge can go to [email protected].

This document is provided for transparency and is not legal advice.