Platforms like Apple HomeKit and IFTTT (If This Then That) help your Internet-connected devices talk to each other. Use these cloud services to build your own domestic surveillance state.

August Smart Lock (HomeKit enabled) | $200

Forget fishing for keys while holding a case of beer. Install this puck on the inside of your door and it unlocks the dead bolt as it senses you (well, your phone) approaching. It works with HomeKit now, so you can use your voice too: “Siri, open the door!”

Power Up: Use August’s app to issue virtual keys to your trusted circle; one for the dog walker, one for the CSA-box delivery guy. Create a HomeKit “scene” that locks the door and turns on a prowler-deterring outside light when you go to bed. It also now works with IFTTT, so you can have it arm your Scout alarm (below) when you leave the house.

Netatmo Presence | $299

This floodlight-camera combo knows when your neighbor’s dog is crapping in your yard. The impressive AI uses shape and movement recognition to determine whether an intruder is a person, car, or animal. Also, watch the camera’s HD feed on your phone in real time. The Presence arrives later this year.

Power Up: Soon you’ll be able to spin up IFTTT triggers that fire whenever a human hangs around on your front lawn for too long: Sound your connected alarm system and email yourself a photo of the loiterer.

Scout’s à la carte alarm ecosystem starts with the siren-equipped Hub. From there, you build out as you wish: motion sensors, door sensors, and window sensors. All the components have a battery fallback, so it’ll raise hell even if your burglar cuts the power.

Power Up: The system works with Amazon Echo: “Alexa, tell Scout to arm Away mode!” It can also trigger other connected gadgets via IFTTT. Somebody coming in the window? Flash your smart lights and blast Slayer on the TV sound bar.