A baby monitor made from phones you already own.
Two phones, one APK, zero cloud.
Slumber is a free, secure baby monitor I vibe-coded with a team of AI agents. It runs on phones you already own, and nothing ever leaves your home network.
What it does
Built in Kotlin with Jetpack Compose and Material 3, hardened by 285 unit tests, and designed for one-handed use during the hours you shouldn't be awake.
Live video and audio
RTSP streaming at 480p to 1080p that even plays in VLC on a laptop.
On-device cry detection
A neural network runs on the phone itself, so baby audio is never uploaded for analysis.
Cry alerts
High-priority notifications on the viewer phone, repeating while crying continues.
Three listening modes
Full video, audio-only, or alerts-only mode that skips streaming to save battery.
Cry filter
Stays quiet until crying is actually detected, muting ordinary nursery noise.
Automatic discovery
The viewer finds the camera on your Wi-Fi via mDNS, no IP typing required.
White noise machine (beta)
Brown, pink, and rain sounds from the nursery speaker, controlled from either phone.
Night mode
Torch and exposure tuning for dark rooms, plus picture-in-picture for multitasking.
Battery intelligence
Drain-rate estimates with time remaining, and the camera powers down when nobody needs video.
Privacy, plainly stated
There is no cloud to breach, no vendor watching, no account to make. The nursery's audio and video travel your home router to your phone and stop there. Cry detection happens on the camera phone itself. No analytics, no crash reporting, no internet connection required after install.
Free, for parents.
No subscription, no ads, no account. A secure option any parent can sideload tonight.
Phones you already own
The spare phone in your drawer becomes the nursery camera. Your everyday phone becomes the viewer.
Vibe-coded with agents
Built as a practice project with a team of AI agents, then hardened by real nightly use.
Two phones, one APK
Install the same app on both devices. The nursery phone starts the camera; your phone discovers it automatically and becomes the viewer.
Build it, run it, sleep better
Slumber is beta software built in the open. Clone the repo, build the APK in Android Studio, and install it on both phones. Store listing is planned; for now it is build-from-source.
Read the source ↗