Score 8.3 out of 10
large rooms Levoit Core 400S-P
$189$219 Discount as claimed by the store. We have not followed this store for the 30 days before the sale began, so we cannot verify the old price yet.How we work this out
Comparison · 2 models
Comparing 2 robot vacuums
Your shortlist side by side: today’s price, our score and every fact the maker states.
-
- Cheapest today
- Highest score
- Best on the most facts
Prices updated on October 17, 2026
Side by side
Green is the best of these 2, also when they share the lead.
Drag a model by its header to move its column, or use the arrows.
| | | |
|---|---|---|
| Price and ranking | ||
| Lowest price | $299Levoit (brand store) best | $499Levoit (brand store) |
| Score | best | |
| Rank | rank 3 of 9 for open-plan spaces | rank 6 of 9 for open-plan spaces |
| Customer rating | – | – |
| Room size | ||
| Room size same on both | open-plan spacesup to 606 ft² | open-plan spacesup to 549 ft² |
| Size, noise and age | ||
| Height lower is better | 23.6 in (60 cm) | – |
| On the market since same on both | June 2023 | June 2023 |
| Smart features and warranty | ||
| App control same on both | Wi-Fi | Wi-Fi |
| Voice assistants same on both | Alexa, Google Assistant | Alexa, Google Assistant |
| Matter same on both | no (assumed) | no (assumed) |
| Cleaning performance | ||
| Clean air delivery rate (CADR) | 391 cfm (664 m³/h) | 354 cfm (601 m³/h) |
| CADR measured to | DOE test | AHAM AC-1 (US standard) |
| CADR for smoke | 391 cfm (664 m³/h) | 354 cfm (601 m³/h) |
| CADR for dust | 398 cfm (676 m³/h) | 373 cfm (634 m³/h) |
| CADR for pollen | 436 cfm (741 m³/h) | 431 cfm (732 m³/h) |
| CADR for fine particles (PM2.5) | 394 cfm (669 m³/h) | 363 cfm (617 m³/h) |
| Room size we compare on | 596 ft² (55 m²) | 539 ft² (50 m²) |
| Room size the maker claims | 606 ft² (56 m²) | 549 ft² (51 m²) |
| Air changes the maker assumes same on both | 4.8 per hour | 4.8 per hour |
| Filter | ||
| Activated carbon filter same on both | yes | yes |
| Running costs | ||
| Filter life | 12 months | – |
| Energy use a year | 387 kWh | – |
| Noise and power | ||
| Noise at the lowest speed | 26 dB | 24 dB |
| Noise at the highest speed | 55 dB | 56 dB |
| Power at the highest speed | 49 W | 70 W |
| Energy efficiency (IEF) | 6 cfm/W | – |
| ENERGY STAR certified | yes | – |
| Air quality sensing | ||
| Air quality sensors | PM2.5 | PM1, PM2.5, PM10 |
| Particle sensor same on both | Laser | Laser |
| Automatic mode same on both | yes | yes |
| Build | ||
| Shape | Floor box | – |
| Width | 312 mm | – |
| Depth | 312 mm | – |
| Weight | 13.7 lb (6.2 kg) | – |
| Extras | ||
| Ioniser | None | – |
| CARB certified same on both | yes | yes |
| Ozone produced | 0 ppb | – |
| Warranty and certification | ||
| AHAM Verifide certified same on both | yes | yes |
| Warranty same on both | 2 years | 2 years |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
The score is out of 10: 60% measured facts and 40% store ratings. A model is ranked only when its CADR is known. Method. Models whose CADR we do not hold yet, so they are not in our ranking. We do track their prices.
Score 8.0 out of 10
medium rooms Blueair Blue Pure 411i+ Max
$127$169 Discount as claimed by the store. We have not followed this store for the 30 days before the sale began, so we cannot verify the old price yet.How we work this out
Score 8.0 out of 10
Score 7.8 out of 10
Score 7.7 out of 10
Score 7.6 out of 10
Score 7.6 out of 10
open-plan spaces Blueair Blue Pure 311i+ Max
$224$299 Discount as claimed by the store. We have not followed this store for the 30 days before the sale began, so we cannot verify the old price yet.How we work this out
Score 7.4 out of 10
Score 7.4 out of 10
Score 7.3 out of 10
Score 7.3 out of 10
Score 7.1 out of 10
Score 6.9 out of 10
Score 6.8 out of 10
open-plan spaces Blueair Blue Pure 211i Max
$262$349 Discount as claimed by the store. We have not followed this store for the 30 days before the sale began, so we cannot verify the old price yet.How we work this out
Score 6.7 out of 10
Score 6.1 out of 10
Score 6.0 out of 10
Score 5.6 out of 10
Score 5.4 out of 10
Score 5.3 out of 10
large rooms Hathaspace HSP002
$299$389 Discount as claimed by the store. We have not followed this store for the 30 days before the sale began, so we cannot verify the old price yet.How we work this out
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- Levoit Core 300-P
- Levoit Core 300S-P
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Show all 11 other modelsShow fewer
Lowest price at every store that ships to the United States, shipping included, before sales tax.
Robot vacuum market report, September 2026 A median price of – and 1 new model.
Frequently asked questions
What does a good air purifier cost in the United States?
The models in our ranking run from about $99 to $749 today. We show the lowest verified price of the day per model, shipping included, before sales tax.
How big an air purifier do I need?
Match it to the size of the room. Each model in the ranking is grouped by the room size its maker states, and the lists keep a model out when it states none. A common rule of thumb is a clean air delivery rate (CADR) of at least two thirds of the room’s floor area in square feet, for a ceiling of 8 feet.
What is the difference between HEPA H13 and True HEPA?
Both are high-efficiency filters. True HEPA is the American name for a filter that catches 99.97% of particles of 0.3 micrometres, and H13 is the European class for 99.95%. We read the class the maker states and do not treat a filter called HEPA-type or HEPA-like as either.
Can an air purifier make ozone?
Some can, mostly models with an ioniser or a plasma feature. California limits ozone from indoor air cleaners to 50 parts per billion, and the CARB certification shows a model meets that limit. Our asthma filter leaves out models whose ioniser cannot be switched off.
How often do you update the prices?
Every day, at every store we follow. We read the prices from the stores’ own product feeds and web stores. We check them for errors and keep them, so every product page shows what a price did over the last 90 days. We only call a discount real when the price also sits below the level of the preceding 30 days. We link to Amazon too, but show no Amazon price until we read it through Amazon’s own API. Until then the price is on Amazon itself. Per store: how and how often
Where we check prices
We read prices every day at most stores, from their product feed or web store. We check them for errors and keep them, so you can see what a price did over the last 90 days. We link to Amazon too, but show no Amazon price until we read it through Amazon’s own API. Until then the price is on Amazon itself.
- Alen (brand store) · United States
- Blueair (brand store) · United States
- Coway (brand store) · United States
- Germ Guardian (brand store) · United States
- Hathaspace (brand store) · United States
- Levoit (brand store) · United States
- Medify Air (brand store) · United States
- Molekule (brand store) · United States
- Rabbit Air (brand store) · United States
- Vornado (brand store) · United States
Whose tests we use
Beside each model we also show where these testers place it in their own lists, without counting it in the score:
How we combine measured facts and owners’ ratings into one score is on the method page.
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