NiNi - Baby Monitor

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About this app

NiNi turns two Android phones into a WiFi baby monitor - no extra hardware, no monthly subscription. Use an old phone as the baby unit and your current phone as the parent unit for real-time audio monitoring, talk-back, and instant cry alerts.

Setting NiNi up as your baby monitor app takes seconds: place one phone in the nursery, keep the other with you, and both devices find and pair with each other automatically over the same WiFi network.

KEY FEATURES OF THIS BABY MONITOR APP

Live Audio Monitoring
Listen to your baby's room in real time with low-latency, peer-to-peer audio streaming. No cloud servers involved - audio never leaves your home network.

Talk-Back / Walkie-Talkie Mode
Press and hold to talk back to your baby instantly, just like an intercom, so you can soothe them without walking into the room.

Real-Time Sound Level Display
See a live audio waveform and sensitivity threshold line on screen, so you always know how loud the nursery is.

Smart Cry & Noise Detection Alerts
Set your own sensitivity threshold and get instant vibration and sound alerts the moment your baby cries or the noise level rises - no need to keep staring at the screen.

Auto-Listen Mode
After an alert, the app automatically switches to listening mode for a duration you choose, so you never miss what's happening.

Reconnect & Remember Pairing
Once two phones are paired, NiNi remembers them and reconnects automatically the next time you open the app.

Reliable Background Monitoring
Monitoring keeps running in the background even when the screen is off, thanks to a dedicated foreground service.

Alerts That Bypass Do Not Disturb
Critical baby sounds reach you even if your phone is set to silent or Do Not Disturb mode.

Customizable Settings
Adjust audio sensitivity, alert duration, and notification sound to match your baby's room and your routine.

Privacy-First Baby Monitor
NiNi is an audio-only baby monitor with no camera and no video - your audio stream is transmitted directly between your two phones over your local WiFi network, never uploaded to a server.

WHY USE AN OLD PHONE AS A BABY MONITOR?
Dedicated baby monitor devices and video nanny cameras are expensive and single-purpose. NiNi lets you repurpose a spare or old Android phone as a full-featured audio baby monitor with talk-back - completely free, with no extra hardware and no subscription.

REQUIREMENTS
Both phones must be connected to the same WiFi network for pairing and monitoring to work. NiNi does not require a SIM card or mobile data on the baby unit.