Updated October 2026
Data from the official Blueair site.
2026 verdict
Same family, very different rooms. The Blueair Blue Pure 511i Max gets the nod in this air purifier comparison on price alone, since the two Blueairs share their filtration stack, their PM1, PM2.5 and PM10 sensing, their Wi-Fi with Alexa and Google Home, and their one-year base warranty. What the smaller model gives up is capacity: the Blueair Blue Pure 211i Max is rated at 435 CFM for up to 674 ft², against 153 CFM and 237 ft² on the 511i, and it adds an on-unit screen. Pick the Blueair Blue Pure 511i Max for a bedroom or home office where a compact, 17 W unit is enough, and move up to the Blueair Blue Pure 211i Max for a living room or open-plan space.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
19% OFF
$112.99
$139.99
Works with
Connectivity
- Wi-Fi 2.4 GHz
News by email
Still comparing? Get what's new by email
New releases and the smart home news worth knowing, in your inbox.
No spam. Unsubscribe in one click.
| Feature | Blueair Blue Pure 211i Max | Blueair Blue Pure 511i Max | Winner |
|---|---|---|---|
| Price | $349.00 | $112.99 | Blueair Blue Pure 511i Max |
| Rating | 4.4 | 4.5 | Blueair Blue Pure 511i Max |
| Warranty | 1 year | 1 year | Tie |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi | Tie |
| Integrations | Google Home, Alexa | Google Home, Alexa | Tie |
| Filtration | HEPA Filter, Activated Carbon Filter, Washable Pre-Filter | HEPA Filter, Activated Carbon Filter, Washable Pre-Filter | Tie |
| Sensors | PM1, PM2.5, PM10 | PM1, PM2.5, PM10 | Tie |
| AHAM Verifide | YES | YES | Tie |
| Auto Mode | YES | YES | Tie |
$349.00
- - Price: $349.00 vs $112.99
- - Rating: 4.4 vs 4.5
Winner
19% OFF
$112.99
$139.99
- + Price: $112.99
- + Rating: 4.5
Frequently Asked Questions
Which is better overall: Blueair Blue Pure 211i Max or Blueair Blue Pure 511i Max?
The Blueair Blue Pure 511i Max comes out ahead overall because it is the more affordable model and ties the Blueair Blue Pure 211i Max on filtration, sensors, connectivity and smart home support. The Blueair Blue Pure 211i Max is the stronger choice when the room is large, since it is rated for 674 ft² against 237 ft².
What is the biggest difference between the Blueair Blue Pure 211i Max and the Blueair Blue Pure 511i Max?
Size and airflow. The Blueair Blue Pure 211i Max is rated at a 435 CFM smoke CADR for rooms up to 674 ft², while the Blueair Blue Pure 511i Max is rated at 153 CFM for up to 237 ft². The 211i is also much bigger, at 366 x 366 x 577 mm against 236 x 236 x 368 mm.
Do the Blueair Blue Pure 211i Max and the Blueair Blue Pure 511i Max use the same filters and sensors?
Both use HEPASilent filtration with an activated carbon layer and a washable pre-filter rated for 9 months, and both report PM1, PM2.5 and PM10. Neither senses VOCs, CO2 or formaldehyde.
Which one works with more smart home platforms?
They are identical here: the Blueair Blue Pure 211i Max and the Blueair Blue Pure 511i Max both connect over 2.4 GHz Wi-Fi and work with Alexa and Google Home, with no Apple Home, SmartThings or Matter support.
Who should buy the Blueair Blue Pure 511i Max?
Anyone cleaning a bedroom, nursery or office up to about 237 ft² who wants the smaller, cheaper Blueair with the same app, sensors and filter as its bigger sibling, drawing only 17 W.
Who should buy the Blueair Blue Pure 211i Max?
Buyers with a large living area who need the extra airflow, plus anyone who wants a screen on the unit rather than just a colour indicator.
Our store on AmazonShop our ideas on AmazonLists of the smart home setups we would put together ourselves, ready to add to your Amazon cart.Shop on AmazonFull comparison table
Compare all 40 Air Purifiers side by side
You are looking at two of them. The full table lines up all Air Purifiers in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 40 Air Purifiers
- 57 specs compared
- 54 filters
- Air Purifiers
Air Purifier AP5
- Air Purifiers
Core 300-P
- Air Purifiers
Eleva 300X
- Air Purifiers
Vital 200S-P
- Air Purifiers
Vital 100S-P
- Air Purifiers
Smart Air Purifier 2 Pro
- Air Purifiers
5520
- Air Purifiers
5510
- Air Purifiers
5530
- Air Purifiers
Airmega AP-1512HHS
- Air Purifiers
Airmega Mighty2
- Air Purifiers
Core 400S-P
- Air Purifiers
Core 600S-P
- Air Purifiers
Vital Pet Pro
- Air Purifiers
BreatheClear Max HP362
- Air Purifiers
Core Mini-P
- Air Purifiers
Blue Pure 311i Max
- Air Purifiers
Blue Pure 511i Max
- Air Purifiers
Blue Signature Small
- Air Purifiers
Purifier Hot+Cool Gen1 HP10