Blueair Blue Pure 511i Max vs Sharp FP-K50UW Plasmacluster

The Blueair Blue Pure 511i Max is the better air purifier overall, rated 3.9 to 3.2. The Blueair Blue Pure 511i Max leads on auto mode and value. The Sharp FP-K50UW Plasmacluster wins on filter cost. The Blueair Blue Pure 511i Max costs $67 less ($112.99 vs $179.99).

Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.

Which should you buy?

• Choose the Blueair Blue Pure 511i Max for auto mode (particle sensor and Wi-Fi app vs no air-quality sensor or app) and value ($0.74 per cfm of smoke CADR vs $1.08 per cfm of smoke CADR).
• Choose the Sharp FP-K50UW Plasmacluster for filter cost ($34.99 a year in filters vs $59.98 a year in filters).

Scores side by side

Each factor is scored 0-100 against the same fixed reference points for every medium rooms air purifier; a clear win is highlighted. How we rank explains each one.

Specifications

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