Roborock S8 MaxV Ultra vs Dreame X40 Ultra: The Honest Head-to-Head Before You Buy

Ever stood in front of two products that look almost identical, cost about the same, and both claim to be “the best”? Then you open twenty browser tabs, read forty reviews, and somehow feel less sure than when you started?

That’s the exact spot a lot of my readers land in with these two robots.

The Roborock S8 MaxV Ultra and the Dreame X40 Ultra both launched in 2024 as flagship machines. Both cost close to $2,000 back then. Both empty themselves, wash their own mops with hot water, dry them with warm air, and stretch out little arms to reach into corners. On paper, they’re twins.

But they’re not the same robot. Not even close, once you look at the lab data.

Quick honesty note before we go further: I dig through independent lab tests, long-term owner reports, and the spec sheets, and then translate all of it into plain English so you don’t have to. Everything in this comparison comes from that research, and I’ll tell you where the sources disagree.

Let’s figure out which one belongs in your home.

Key Takeaways

• The Dreame X40 Ultra wins most lab tests. It beat the Roborock on deep carpet cleaning, obstacle avoidance, hair tangles, battery efficiency, and navigation in a head-to-head from Vacuum Wars.
• Mopping is basically a tie. Both handle dried stains well, but the Dreame’s mop reaches farther along edges and under furniture.
• The Roborock still has real strengths. It has a built-in voice assistant, a more compact dock footprint, and it lifts its mop higher over rugs.
• Price has flipped the story. Both have dropped far below their launch prices, and the Dreame is often the cheaper of the two right now.
• My pick for most homes: the Dreame X40 Ultra. The Roborock makes sense for specific setups, which I’ll explain below.

What These Two Robots Are (In Plain English)

Think of both of these as a robot vacuum and a robot mop in one body, parked on a “home base” that does all the gross chores for you.

The robot goes out, vacuums, mops, and comes home. The base then sucks the dirt out of the robot into a sealed bag, rinses the mop in hot water, dries it so it doesn’t get smelly, and refills the robot’s water tank. You mostly just swap the bag every couple of months and top up the clean water tank.

So what’s actually different? Mainly three things:

1. How they mop. The Roborock S8 MaxV Ultra uses one flat mop pad that vibrates fast, a bit like a floor scrubber. The Dreame X40 Ultra uses two round pads that spin, like two tiny floor polishers.
2. How they vacuum. Roborock uses two rubber rollers that work together. Dreame uses one rubber brush, but with more raw suction behind it.
3. How they handle carpet. Roborock lifts its mop up and out of the way. Dreame can lift its mops too, but it can also drop them off at the dock entirely before vacuuming your rugs.

If you’re still getting used to the jargon, my guide to the key features to look for in a smart vacuum breaks it all down.

Who These Robots Are For

Both of these are for people who want to stop thinking about floors. Honestly, that’s the whole point of spending this kind of money.

They’re a great fit if you:

• Have a mix of hard floors and rugs and want one machine for both
• Hate mopping (who doesn’t?) and want it done several times a week
• Have kids or pets and deal with daily crumbs, paw prints, and spills
• Live in a medium or large home and want one robot to finish in a single run

They’re probably overkill if you live in a small apartment with mostly carpet. In that case, a simpler vacuum-only robot will save you hundreds of dollars.

Side by Side: The Specs That Actually Matter

Here’s a quick table with the numbers people ask me about most. I pulled these from the product listings and independent reviews.

A quick word of warning on suction numbers. Pascals (Pa) sound impressive, but they don’t tell the whole story. I’ve seen robots with lower numbers outclean “stronger” ones because of better brushes. That’s why the real test results below matter more than this table.

Key Features and What They Mean for Your Daily Life

Specs are nice. But what do these features actually do for you on a random Tuesday? Let’s walk through the big ones.

1. Suction Power and Deep Carpet Cleaning

Here’s where the Dreame pulls ahead in a way you can feel.

In a head-to-head test from Vacuum Wars, testers buried sand deep in carpet and weighed what each robot picked up. The Dreame removed 84% of it. The Roborock removed 76%, which was right at the average of every robot they’ve tested.

The real-life benefit: If you have rugs where grit and pet dander settle deep into the fibers (entryway rugs, I’m looking at you), the Dreame will leave them noticeably cleaner over time.

One small but important detail: that test used the Dreame X40 Master, which is the same robot with a dock that connects to your plumbing. The robot itself is the same, so the cleaning results carry over.

2. Obstacle Avoidance (a.k.a. Will It Eat My Charger?)

We’ve all been there. You come home, and your robot is stuck, wheezing, with a phone cable wrapped around its brush. Or worse, it found the dog’s “accident.”

Both robots have a front camera plus a light sensor to spot objects. But the Dreame is trained to recognize 120 types of objects, versus 73 for the Roborock. And in testing, that difference showed up. Vacuum Wars scored the Roborock right around average, while the Dreame earned one of the highest scores they’ve recorded.

TechGearLab had a similar experience with the Dreame. It dodged every single item in their obstacle course.

The real-life benefit: Less “pre-cleaning” before the robot runs. You still shouldn’t leave Legos everywhere, but you won’t have to sweep the floor clear of every sock first.

3. Mopping Performance

The Dreame can swing one of its spinning pads out to the side, which lets it mop along baseboards, under door edges, and under low furniture better than the Roborock in testing. TechRadar also praised how well it gets under furniture edges.

The real-life benefit: Fewer grimy lines along your kitchen baseboards. If you’ve ever noticed a dirty “border” around a room after mopping, you know why this matters.

4. Carpet Handling

This is where each brand took a different road, and honestly, both have a point.

The Roborock lifts its mop pad higher off the floor when it rolls onto a rug. The Dreame only lifts its pads about 10.5 mm, which is fine for thin rugs but can be tight on plush ones. But here’s the clever twist: the Dreame can detach its mop pads at the dock, vacuum all your carpets dry, then come back and pick the pads up for the hard floors.

The real-life benefit: If you have thick, fluffy rugs, the Dreame’s “leave the mops at home” trick means zero chance of damp carpet. If your rugs are thinner and you just want one smooth run, the Roborock’s high lift is simpler.

5. Hair and Tangles

If you share your home with long hair (human or furry), pay attention here.

In the Vacuum Wars hair tangle test, 59% of the hair ended up wrapped around the Roborock’s rollers. The Dreame only held onto 26%. That’s a big gap.

But I don’t want to oversell it. Different tests, different results. So my honest read is: the Dreame tangles less, but neither one is a miracle for a golden retriever in shedding season. My roundup of the best robot vacuums for pet hair covers machines built specifically for that.

6. Battery Life and Coverage

This one surprised me.

Both robots claim similar runtimes. But when Vacuum Wars measured real efficiency across all power settings, the Dreame estimated around 2,591 square feet per charge versus about 1,489 for the Roborock. That’s a massive difference for bigger homes.

The real-life benefit: In a large house, the Dreame is more likely to finish the whole job in one go, without heading home to recharge halfway through.

7. The App and Voice Control

Roborock’s app is known for being clean and easy. It also has a built-in voice assistant, so you can just say “Hello Rocky” and tell it what to clean. No smart speaker needed.

The Dreame app is packed with options, maybe too many. It also doesn’t have its own voice assistant, though it works with Alexa, Google Assistant, and Siri, as Digital Trends points out.

The real-life benefit: If you’re not a “tinker with settings” person, the Roborock will feel friendlier from day one.

Pros and Cons

Let’s lay it all out, the good and the not so good.

Roborock S8 MaxV Ultra

Pros:

• Built-in voice assistant works without a smart speaker
• Lifts its mop high over rugs, so thick carpets stay dry
• The dock is shorter from front to back, so it fits more easily against a wall
• Clean, easy app that’s great for beginners
• Excellent everyday debris pickup on hard floors

Cons:

• Long hair tangles in the dual rollers much more
• Obstacle avoidance tested only average for its price class
• Weaker deep carpet cleaning than the Dreame

Dreame X40 Ultra

Pros:

• Top-tier obstacle avoidance in multiple independent tests
• Stronger deep carpet cleaning
• Mop reaches farther into edges and under furniture
• Can leave mop pads at the dock for completely dry carpet cleaning
• Much better real-world battery efficiency for big homes
• Fewer hair tangles on its brush

Cons:

• Base station suction for emptying the bin was weak in TechRadar’s testing
• Mops only lift about 10.5 mm on carpet
• The dock is longer and can stick out from the wall
• No built-in voice assistant

Reasons to Choose Each One

So which one should you get? Here’s how I’d think about it.

Choose the Dreame X40 Ultra If…

You want the best overall cleaner of the two, and you don’t mind spending ten minutes learning the app. It’s the stronger pick for:

• Cluttered homes. Kids’ toys, cables, pet bowls. The Dreame’s obstacle avoidance is simply better.
• Big floor plans. That battery efficiency means fewer mid-clean pit stops.
• Homes with thick rugs. Leaving the pads at the dock is the most foolproof way to keep carpet dry.
• Anyone who hates grimy edges. The extending mop is a real, visible upgrade.

When the TechRadar reviewer called it the best vacuum and mop performance they’d seen from a robot, I wasn’t shocked after reading the data.

Choose the Roborock S8 MaxV Ultra If…

You value simplicity and a tidy setup over the last few percentage points of cleaning power. It’s a smart pick for:

• Tight spaces. The shorter dock is easier to tuck into a hallway or against a wall.
• Voice control fans without a smart speaker. “Hello Rocky” just works.
• Short-haired households. If tangles aren’t your problem, the Roborock’s biggest weakness mostly disappears.
• Roborock app fans. If you already own another Roborock, you’ll feel right at home.

How They Compare to Newer Models

Here's a counterintuitive thought: sometimes the smartest buy is last year's flagship.

Newer robots have arrived since 2024, including machines with legs that climb over thresholds. You can see one in my Dreame X50 Ultra review. They're impressive, but they also cost a lot more. For most homes, these two older flagships at today's prices deliver 90% of the cleaning for a fraction of the cost.

Helpful Tips and Things to Know Before You Buy

Okay, let's get practical. These are the things I wish someone had told me before I started researching robots years ago.

Check the Price Before You Click

This is the single biggest factor right now. Both robots have fallen far below their launch prices, and the gap between them keeps moving.

That's a flip from launch day, when the Dreame was the pricier one. Prices change all the time, so use a tracker like camelcamelcamel for the Dreame X40 Ultra to see if you're getting a real deal.

Pick the Right Version

Both robots come in two dock styles:

• Standard dock with clean and dirty water tanks you refill and empty by hand. Most people want this one.

The plumbed versions are amazing if you have a laundry room or a spot near a sink. Otherwise, the installation is more hassle than it's worth. I suggest getting help from someone handy if you're not comfortable with basic plumbing.

Measure Your Dock Spot First

Seriously, measure. These docks are big, and they need breathing room on the sides and in front. The Dreame's dock is longer front to back, so it can stick out more.

Budget for Running Costs

You'll be buying dust bags, filters, mop pads, side brushes, and cleaning solution. Plan for it, and follow a simple robot vacuum maintenance checklist to make parts last longer.

Set Up Wi-Fi on 2.4 GHz

Most robots in this class connect over 2.4 GHz Wi-Fi. If setup keeps failing, that's usually the culprit.

A Word on the Cameras

Both robots have front cameras and can stream live video to your phone. That's handy for checking on pets. If that makes you uneasy, you can simply leave the remote video features switched off. Keep the firmware updated and use a strong password on your account either way.

Multiple Floors? No Problem

Both robots can save maps for several levels of your home. You'll just need to carry the robot upstairs. My tips on using a robot vacuum on multiple floors make this easier.

Is It Time to Stop Mopping for Good?

Let me paint the "before and after" for a second.

Before: You spend your Saturday morning pushing a vacuum around, then filling a bucket, then mopping, then waiting for the floors to dry before anyone walks on them. By the next Wednesday, the kitchen is sticky again.

After: The floors get vacuumed and mopped while you're at work. Every day, if you want. You come home to clean floors and just... sit down.

That's what either of these robots can do for you. And here's the thing: at today's prices, you're getting a machine that cost nearly $2,000 not long ago.

If you want the stronger all-around cleaner, especially for a busy home with rugs, clutter, or a big floor plan, I'd go with the Dreame X40 Ultra. If you want a simpler app, a more compact dock, and built-in voice control, the Roborock S8 MaxV Ultra is still a very good machine.

Either way, check the current price first. If it's near the recent lows, it's a genuinely great time to buy.

Frequently Asked Questions

Which one mops better?

They're very close. On dried stains, testers scored them nearly the same. The Dreame reaches farther along edges and under furniture, so it wins on coverage.

Is the Dreame X40 Ultra good for pet hair?

It tangles less than the Roborock, which is great for long hair. But one lab found it picked up only about half the pet fur embedded in carpet. If you have a heavy shedder, check out dedicated pet hair picks too.

Do I need the plumbed version?

Only if you have a water line and drain near where the dock will sit. The standard dock with refillable tanks works great for most homes.

Can either robot handle thick carpet?

Yes, but in different ways. The Roborock lifts its mop higher. The Dreame can leave its mop pads at the dock and vacuum the carpet completely dry.

Final Verdict

If I had to pick one for a friend today, it'd be the Dreame X40 Ultra. It cleans carpets deeper, dodges clutter better, tangles less, and covers more ground per charge, and it's often the cheaper of the two right now. The Roborock S8 MaxV Ultra is still a strong choice for smaller spaces, short-haired homes, and anyone who wants a simpler app with voice control built in. Either one will take mopping off your to-do list for good.

So, which one fits your home? If you've got a question about your floors, your rugs, or your dock spot, drop it in the comments. I read every one, and I'm always happy to help you figure it out.