Shelly Presence Gen4 vs Apollo Automation MSR-2

Buy the Shelly Presence Gen4 if you need multi-person tracking, several detection zones, or native Matter and Zigbee support. Buy the Apollo MSR-2 if you run Home Assistant and want a small, ESP32-based sensor that also measures CO2, light, UV, temperature and pressure. The Shelly is the stronger pure presence sensor; the Apollo is the stronger all-in-one environmental node. Owners of both praise still detection, and both need tuning to ignore pets and fans.

• Choose the Shelly Presence Gen4 if you want one sensor that tracks up to 6 people across up to 10 zones and works with Matter, Zigbee or Wi-Fi out of the box.
• Choose the Apollo MSR-2 if you use Home Assistant and want presence plus CO2, lux, UV, temperature and pressure in one small ESP32 device.