Lumo: Sleep Tracker & Sonar

SentryRF

In-app purchases

About this app

Lumo learns your sleep, then helps guide your nights — using nothing but your phone on the nightstand.

No wearable. No chest strap. No bedside hardware. Lumo turns your phone's speaker and microphone into a contactless sonar sensor: it emits a sound too high to hear, then listens to how it reflects off your chest to track your breathing and movement through the night.

Everything happens on your device. Lumo never records your audio, never asks for an account, and never sends your night to the cloud. Your sleep stays yours.

━━━━━━━━━━━━━━━━━━━━━━
WHAT LUMO TRACKS
━━━━━━━━━━━━━━━━━━━━━━
• Breathing rate — contactless, sensed by sonar as your chest rises and falls
• Sleep stages — light, deep, and REM (dream) sleep, shown as a clear hypnogram
• Movement and restlessness through the night
• A simple 0–100 sleep score that sums up your night at a glance
• Nighttime sounds — snoring, talking, and more, recognized on-device

━━━━━━━━━━━━━━━━━━━━━━
WHY LUMO IS DIFFERENT
━━━━━━━━━━━━━━━━━━━━━━
✔ Contactless — nothing on your body, nothing in your bed
✔ 100% on-device — no cloud, no account, your data never leaves your phone
✔ Audio is never recorded — Lumo analyzes sound in the moment and keeps only the results
✔ No ads, ever
✔ Works through the night with the screen off
✔ Honest engineering — we tell you plainly how it works and what it can and can't measure

━━━━━━━━━━━━━━━━━━━━━━
WAKE UP TO INSIGHT
━━━━━━━━━━━━━━━━━━━━━━
Each morning, Lumo greets you with a calm, beautiful summary of your night — your score, how you moved through your sleep cycles, and a plain-language read on how you slept. No jargon, no guilt. Choose a soft aurora glow or a warm golden sunrise to wake up to.

━━━━━━━━━━━━━━━━━━━━━━
WIND DOWN BEFORE BED
━━━━━━━━━━━━━━━━━━━━━━
Rough night? Lumo offers an optional wind-down coach — a few calm, guided minutes before sleep, including a gentle breathing exercise to help you settle. It's always your choice, never a nag.

━━━━━━━━━━━━━━━━━━━━━━
SOOTHING SOUNDSCAPES
━━━━━━━━━━━━━━━━━━━━━━
Drift off to adaptive sleep sounds that fade as you settle, with a volume that won't disturb your alarms.

━━━━━━━━━━━━━━━━━━━━━━
UNDERSTAND YOUR SLEEP
━━━━━━━━━━━━━━━━━━━━━━
Lumo includes a friendly, built-in guide: what deep sleep and REM actually do, what a healthy night looks like, why a consistent bedtime matters, and small changes that often help you sleep better.

━━━━━━━━━━━━━━━━━━━━━━
GETTING THE BEST RESULTS
━━━━━━━━━━━━━━━━━━━━━━
Place your phone on the nightstand at about bed height, screen toward you, plugged in. Tap Begin, then sleep as normal. Lumo runs a quick device check the first time to confirm your phone's speaker and microphone can handle the sonar tone.

━━━━━━━━━━━━━━━━━━━━━━
A NOTE ON PRIVACY
━━━━━━━━━━━━━━━━━━━━━━
Lumo is built privacy-first. Sound is processed entirely on your phone to detect breathing, movement, and events. Recordings are never saved or transmitted. There are no accounts and no third-party trackers.

Lumo is a wellness tool to help you understand your sleep. It is not a medical device and does not diagnose, treat, or prevent any condition. If you have concerns about your sleep or breathing, please speak with a healthcare professional.

Learns your sleep, guides your nights. Download Lumo and meet your mornings rested and invigorated!

What’s new

Lumo: Sleep tracker - contactless sonar - breathing monitor - wind-down sounds - relaxation coach