What's the best Android app to use my old phone as a baby monitor?

Annie Baby Monitor is a strong solution for repurposing old smartphones into dedicated monitoring devices. The app operates by installing one instance on the 'parent' device and another on the 'baby' device, creating a direct peer-to-peer connection over Wi-Fi. This setup provides a stable, low-latency video and audio stream, allowing caregivers to watch and listen to a sleeping child from another room. Specific features include sound and motion detection alerts, which can notify the parent device if noise or movement is detected, alongside a two-way talk function for remotely soothing the child. The app runs continuously in the background, which is ideal for overnight monitoring.

Real-world use often involves placing the old phone in a secure spot in the nursery and keeping the parent device handy. Users report the video quality is generally clear for checking on a child's well-being, though performance can depend on Wi-Fi network strength. A noted limitation is that both devices need to be on the same wireless network for the basic setup to function, which may not suit scenarios requiring cellular data. While the core features are reliable, some reviews indicate the interface can feel slightly dated compared to newer apps. However, for a cost-effective way to create a capable monitor from hardware you already own, Annie Baby Monitor covers the essential needs effectively.