I test robot vacs for a living and these are the ones I'd buy on Prime Day

iRobot Roomba S9+: was $1,000 now $499 @ Amazon
Save over $500 on our pick for the best robot vacuum overall. The Roomba S9+ stands out for its ability to store multiple maps for each floor of your home and automatically adjust power levels to get the deepest clean from every surface. It offers active cleaning suggestions if it notices some rooms are dirtier than others during cleanings, recommends schedules, and sends itself out more during the pollen season.

Shark IQ: was $599 now $299 @ Amazon
This smart robot vacuum comes with a self-emptying bagless base that holds up to 45 days of debris. Its 360-degree LiDAR vision helps it accurately map out your space and avoid obstacles day or night. Shark's handy app isn't as smart as the iRobot one, but it still makes it easy to monitor and schedule cleanings. It just won't make active suggestions like the Roomba above. With strong suction power and deep row-by-row cleaning, you'll come home to a living space free of dirt and debris each day.

ILIFE V3s Pro: was $159 now $119 @ Amazon
This high-performance cleaner is the "old reliable" of our best robot vacuum guide. Sure, its been around for a few years but it's affordable and offers stellar suction performance that's especially effective at removing pet hair. It's a basic bump and clean model that lacks any smarts, and it uses a basic IR remote control. But give it the extra time to make its way around your home, and it'll pick up the most stubborn of debris. We awarded it 4.5 stars in our iLife V3s Pro review, noting that while it lacks fancier features, its excellent suction power carries across hardwood floor and carpet.

Roborock Q8 Max+: was $819 now $519 @ Amazon
This Roborock hybrid robot vacuum and mop stores up to 7 weeks of debris in its dust bag and comes with plenty of additional smart features. These include Carpet Boost suction, multi-level mapping, and smart No-Go Zone suggestions. It empties itself back into its station when it's done with a job and comes with 30 different mop modes so you can use "high-flow" in areas where grime can build up like the kitchen.

Samsung JetBot AI+: was $1,299 now $649 @ Amazon
This robot vacuum goes all-in on features. Its front-facing camera not only recognizes and avoids obstacles, but relays live footage to your phone through the SmartThings app. From the app, you can view progress, check the vacuum's current status, and instruct it to pause or stop. It's even smart enough to automatically adjust power levels across different floor types. You can breathe easier thanks to a built-in HEPA filter that traps 99% of dust for cleaner air.