Snortle

A snore and sleep tracker for Android. It is an attempt to replace SnoreLab with something that is less bloated and not tied to a private service.

The Tonight screen with a Start sleeping button, an alarm window chip, last night's snore score ring and a list of sleep sounds — Tonight: start recording, last night's score and the sleep sounds.

The History screen with a bar chart of snore score over 14 nights, buttons for 7, 14 and 30 days, and summary tiles — History: score trends over 7, 14 or 30 nights.

A list of nights, each with a score ring, time in bed, time asleep and time snoring — A card for every night.

One night in detail, with a large score, tiles for time in bed, time asleep, breath rate and breathing pauses, and the start of a snoring chart — A single night: score, sleep times and breathing.

Charts of breath rate and phone movement across a night on a clock axis — Breath rate and phone movement through the night.

The Settings screen with recording options and a smart alarm window from 06:30 to 07:15 with a minimum rest slider — Settings: recording options and the smart alarm window.

Why

SnoreLab is closed source, heavy with features and accounts, and keeps its data in a service I do not control. I wanted the useful part, a score for the night and a few clips to listen to, in an app that works on its own and keeps recordings on the phone.

What it does

Tonight: one button starts recording. The microphone is analysed each second and the audio is thrown away. Only per-minute totals are kept, plus a few short clips of the loudest snoring.
Snore score and time snoring: a second counts when it is well above the room's noise and low in pitch, and an on-device sound classifier confirms it is snoring rather than speech, a television or a thump.
Breathing and pauses: an approximate breath rate, and a note when snoring stops for a while and then restarts. It is not a medical device and does not detect apnea.
Sleep and wake: estimated from the phone's movement and screen.
Smart alarm: wakes me at the first stir inside a window I set, never before a minimum rest and always by the latest time.
Sleep sounds: plays any audio file I put in a folder, with a timer and a fade-out.
History: trends over 7, 14 or 30 nights and a page per night with charts on a clock axis.
Sonar mode is an experiment, off by default, that listens for chest movement using an inaudible tone. It is not validated.

Under the hood

Native Kotlin and Jetpack Compose, with a microphone foreground service and the data in a local database. It works with no network.
Detection is layered: an adaptive threshold finds candidates, the YAMNet classifier runs only on those seconds, and a smoother removes lone seconds and fills gaps between breaths.
An optional archive on a small Worker can keep clips and nights from the phone. Clips are removed from the phone after a week once uploaded.

Kotlin
Compose
Android
On-device ML
Workers

A personal app for my own phone. Screenshots are from a debug build on an emulator with invented nights. Not a medical device.