Surface detection
It starts by finding stable echoes.
The app uses the phone speaker and microphone to test whether the room has stable acoustic surfaces. Without a stable baseline, breathing and sleep movement estimates are not treated as reliable.
Rhydhm
A quiet sleep lab in your phone.
Rhydhm is an experimental Android app for phone-based acoustic sleep sensing. It tries to map stable room surfaces, watch for movement near a body candidate, estimate breathing when possible, and support wake-window alarms.
Motion
It separates phone motion from room motion.
Motion sensors help identify when the phone itself moved. Acoustic changes can then be interpreted more carefully instead of assuming every shift is the person sleeping.
Breathing
Breathing is estimated only when the signal is strong.
The app looks for rhythmic motion near a candidate body surface. If the signal is weak or unstable, it should show uncertainty rather than pretend to know the breathing rate.
Alarm
The alarm is designed around wake opportunities.
The goal is to trigger alarms near a chosen wake window when the app sees signs that waking may be easier. This remains experimental and should be backed up with a normal alarm.
Sessions
Sessions can be reviewed and exported.
Rhydhm records session summaries so signal quality, surfaces, movement, phone stability, and alarm events can be inspected after a test night.
Experimental
It is not a clinical sleep lab.
The app is for wellness experimentation and algorithm development. It is not intended for medical diagnosis, treatment, or safety-critical monitoring.
Documents
Read the policy pages
These pages describe how the sleep app handles local data, sensors, alarms, beta analytics, and exports.
Privacy
Sensor and session data
Read what the app uses, why it uses it, and how local storage and exports work.
Terms
Experimental use
Read the basic terms for alarms, sensor permissions, diagnostics, and beta behavior.
Support
Questions
Contact Rhypple if you need help with privacy, deletion, or app support.