Which Cheap Roomba Should You Buy?

Buy the Roomba 105 Vac. It is the cheapest machine iRobot sells with real LiDAR mapping, and each dearer cheap Roomba adds exactly one thing to it: the 105 Combo adds a pump-fed mop, the 105 AutoEmpty adds a sealed dock rated at 75 days, and the 115X Combo adds a published suction figure and a 90-day dock at a price that has climbed well above this site's $300 ceiling. Buy the 105 Combo if you have hard floors and want mopping; buy the 105 AutoEmpty if somebody in the house reacts to dust; skip the 115X at today's price.

iRobot's naming makes this harder than it needs to be. There is a 105 Vac, a 105 Combo, a 105 Vac with an AutoEmpty dock and a 115X Combo, and the model numbers do not tell you which is which. The good news is that the underlying machine barely changes.

#	Product	Best for	Score	Price
01	iRobot Roomba 105 VacThe lowest price at which you can buy genuine LiDAR mapping from a company that has been doing this for twenty years. It publishes no suction figure.	Cheapest real LiDAR	6.9out of 10	$159.99 - View on Amazon $299.9947% off #ad Price last verified October 17, 2026. How we are funded
02	iRobot Roomba 105 ComboThe 105 Vac with a pump-fed mop pad bolted on for thirty dollars more. The mop is better engineered than most at this price and the carpet handling is the compromise you pay for it.	Cheapest Roomba that mops	6.8out of 10	$179.00 - View on Amazon $319.9944% off #ad Price last verified October 17, 2026. How we are funded
03	iRobot Roomba 105 Vac with AutoEmpty DockThe 105 Vac plus a sealed-bag dock that traps particles down to 0.7 microns. The only machine here that publishes a filtration figure that small.	Best for allergy households	6.9out of 10	$279.00 - View on Amazon $449.9938% off #ad Price last verified October 17, 2026. How we are funded
04	iRobot Roomba 115X ComboThe only iRobot we rank that prints a Pascal figure, with the longest dock interval iRobot states. The number is new enough to deserve skepticism, and the price has since climbed well above this site's ceiling.	The first Roomba that publishes suction	7.9out of 10	$469.99 - View on Amazon #ad Price last verified October 17, 2026. How we are funded

Both machines scored on the published rubric from How We Pick: suction 25%, navigation 25%, pet hair 20%, running cost 20%, setup 10%. Editorial judgments about published specifications, not test results.

Three of these four are the same robot. That makes this an unusually clean comparison, because the question is not which machine is better - it is which single upgrade is worth its price gap to you.

1. The map is not optional and all four have it. Every machine here uses iRobot's ClearView LiDAR with keep-out zones. Mapping is the feature that decides whether a robot vacuum becomes part of your week, and it is already included at the bottom of this ladder - so it is not a reason to step up.
2. Then: do you want it to mop? That is the only difference between the 105 Vac and the 105 Combo, and it is one step on the ladder.
3. Then: do you want it to empty itself? That is the only difference between the 105 Vac and the 105 AutoEmpty, and it is a bigger step than the mop.
4. Last: do you want a number for the suction? That is what the 115X adds, and at its current price it is the most expensive answer on this page by a wide margin.

That table is the page. Three of the four rows are the same robot with one accessory, and the fourth is a different, newer machine that has drifted out of the budget tier.

On hard floors, yes, and the reason is the pump. Most mop combos at this price are a damp cloth dragged behind the machine, soaking at the start of a run and dry by the end. iRobot's uses a micro-pump that meters water to keep the pad uniformly moist, and a SmartScrub mode that moves back and forth rather than in one direction, which is the difference on a dried spill rather than on dust.

The catch is carpet. The 105 Combo detects carpet and avoids it - the pad does not lift. So a mop run cleans your hard floors and drives around your rugs, which is correct behavior and is not the same as cleaning the whole floor. If your home is a real mix of carpet and hard flooring, the machine that lifts its pad is not a Roomba at this price, and best for carpet and hard floors is the page for that.

It depends entirely on which problem you have, and the two answers are genuinely different.

• If emptying is a chore you dislike: no, not at this gap. Three brands here sell a self-emptying machine for less than iRobot charges for the dock alone, and two of them state a longer interval. The cheapest self-emptying docks page ranks them.
• If emptying is the actual problem - somebody reacts to dust: yes, and it is the best answer on the site. Tipping a bin releases exactly the fine particles you removed from the floor, indoors. The AutoEmpty bag is sealed and iRobot states it traps 99% of allergens as small as 0.7 microns, which is the finest published figure we can cite on any machine here. Best for allergies makes the full case.

The Roomba 115X Combo is the most interesting machine iRobot has put near this price range, and we do not recommend buying it today. Both halves of that need explaining.

It is interesting because iRobot finally prints a number. 15,000 Pa, on a brand that spent years declining to publish any Pascal figure and quoting ratios against its own old machines instead. It also carries an anti-hair-wrap claim iRobot has never made for the 105 line, and a dock stated at 90 days rather than 75.

We do not recommend it because of what the live price has done. When we reviewed it, the 115X undercut every self-emptying machine on this site. It has since climbed well past the $300 ceiling this site exists to serve, which removes the only argument for buying it over iRobot's own 105 AutoEmpty - the same app, the same LiDAR, a sealed bag with a finer published filtration figure, and inside the ceiling. The price on its card above is read from the retailer daily, so check it rather than trusting this paragraph: if it comes back under the ceiling, it is a strong machine and the argument reverses.

Two further caveats apply whatever it costs. A brand-new 15,000 Pa claim from a manufacturer that previously published nothing deserves one raised eyebrow, because Pascal figures have no shared test standard between manufacturers and cannot be compared backwards against iRobot's own ratio-quoting 105 line. And its published coverage is up to 900 sq ft per charge, where the 105 line states recharge-and-resume - so for a large floor plan the cheaper machine may finish a job the dearer one does not.

A fair comparison has to include the things all four lack, because at these prices rival brands include several of them.

• A published suction figure on the 105 line. '70x more power-lifting suction' is a comparison to iRobot's 600 series, a machine from 2012. It is not a specification and it cannot be ranked against the 6,000Pa to 12,000Pa figures the budget brands print.
• Multi-floor maps. The 105 listings state room selection and keep-out zones; none of them claims saved maps for more than one floor. Several cheaper machines do, which matters in a two-story house - see best for a two-story house.
• Structured-light obstacle avoidance. No machine on this page has it. The 115X states it steers around shoes, pet bowls and furniture; the 105 line maps walls, which is not the same thing. The only machine under $300 with structured light is the Roborock Q10 S5+.
• Cheap consumables. iRobot filters, pads and dock bags cost more than the generic parts the budget brands use, and the 115X listing asks for filters and brushes every three to six months. Over three years that gap is real money - the arithmetic is on running costs.

The honest summary of this page is that you pay iRobot for the app, the map maturity and the certainty that filters will still be on sale in five years - and you pay for it in published specification. If that trade does not appeal, the best Roomba alternatives under $300 is the page that spends the same money on hardware instead, and Roborock vs Roomba is the brand-level version of the argument.

We have not handled any of these machines. Every figure above is iRobot's own, read off the four listings and cited below: the 0.7-micron bag figure, the 75-day and 90-day dock intervals, the 15,000 Pa claim, the 900 sq ft coverage figure and the SmartScrub description. We have not timed an emptying cycle, measured what a sealed bag releases, compared the 105 line's unpublished suction against anything, or confirmed whether the 115X's map handles more than one floor. Where iRobot does not publish a figure - the 105 Combo's height, any Pascal number on the 105 line - we have written that rather than estimating it.