Not directly baby related but I can control white noise / sleep music from my phone via Spotify and have one of these in the baby’s room and it works so well!
Google Nest Mini
So handy especially during the night and when your baby is in the newborn stages. I used this religiously for the first few months just to make sure baby was dressed appropriately for sleep time
Buy Tommee Tippee Groegg Digital Thermometer & Nightlight