Nasrallah tests robotic vacuums in a multiroom lab to evaluate how well each model removes surface debris on low-pile carpet and bare floors, whether it can get into tight corners, and how well it navigates and cleans multiple types of rooms with common robotic vacuum pitfalls, such as rug tassels and chair legs.

And because many robotic vacuums connect to the internet, our Digital Lab evaluates the data privacy and security of each connected vacuum.

We also factor in data for predicted reliability and owner satisfaction, based on 7,600 CR members’ experiences with their own robotic vacuums.

For complete test results and even more options, see our robotic vacuum ratings or read our vacuum buying guide to learn more about all the vacuum types we test.

Read on to see how the iRobot S9+ and LG CordZero duke it out when it comes to cleaning, ease of use, navigation, and more.