Grounded in what we can say.
Sanctuary's defaults are practical and evidence-aware. The eye-break cadence, breath pacing, and sound options are referenced openly, with limits stated plainly.
Five anchors.
The 20-20-60 reset.
Sanctuary's eye-break cadence keeps the memorable twenty-minute, twenty-foot structure and extends the rest window to a guided minute.
Slow breath, paced gently.
Paced-breathing research often studies slow rates near 5-6 breaths per minute. Sanctuary uses a brief, comfortable breathing window as a transition cue, not as a health guarantee.
Binaural beats and theta.
Sanctuary's optional 250 Hz / 4 Hz theta binaural pairing draws on a body of work on auditory entrainment and attention. Effects are individual and additive rather than primary — included as an option, not a claim.
Spectral floor, stable attention.
Pink noise (1/f spectrum) is associated with steadier-state attention than silence or white noise in some studies. Sanctuary's optional pink noise generator runs in an AudioWorklet for low overhead.
Context, not a diagnosis.
With explicit consent, Sanctuary can read the standard Bluetooth Heart Rate Service in a compatible browser and offer a slower, dismissible breath cadence. Raw readings remain on device by default. The signal does not diagnose, score, or automatically start a session.
What we measure, and don't.
Your sessions belong to you.
We keep session metadata — start/end timestamps, your tier, and the settings you've changed — plus pseudonymous product analytics. We do not log audio, microphone input, or screen content; audio is generated on your device. Biosignal permissions are off by default, can be cleared in Settings, and are included in your JSON export if recorded. Only separately opted-in derived summaries can sync to an account; raw readings are not uploaded.
Defaults you can trust.
Every cue in Sanctuary has a practical reason and a clear limit. Try the loop, or read the policy that governs your data.