Molekule
Molekule Air Pro
$979.99
Released 2021
Best Air Purifiers · head-to-head
Molekule Air Pro vs Alen BreatheSmart 75i
A sourced, side-by-side comparison. Alen BreatheSmart 75i is cheaper at $799. Every spec and price links to its source.
Alen
Alen BreatheSmart 75i
$799Cheaper
Which is better: the Molekule Air Pro or Alen BreatheSmart 75i?
On the specs we track, they're closely matched. The Alen BreatheSmart 75i is the cheaper at $799.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Molekule Air Pro | Alen BreatheSmart 75i |
|---|---|---|
| US price | $979.99 | $799 |
| Brand | Molekule | Alen |
| Released | 2021 | — |
| Cadr smoke (CFM) | — | — |
| Coverage (sq ft) | 1000 | 1400 |
| Hepa | Yes | Yes |
| Filter type | PECO-HEPA Tri-Power filter + Activated Carbon (PECO = Photo Electrochemical Oxidation, destroys pollutants) | Advanced Particle filter + Medical-grade True HEPA (H13) + Ionizer (switchable); optional Carbon layer (Fresh/Ultimate filters) |
| Noise db min | 33 | 25 |
| Smart | Yes | Yes |
| Energy star | No | Yes |
| Release | 2021 | — |
Sources — Molekule Air Pro: molekule.com (verified 2026-06-15). Alen BreatheSmart 75i: alen.com (verified 2026-07-07).
What's the difference between the Molekule Air Pro and Alen BreatheSmart 75i?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Coverage (sq ft): Molekule Air Pro 1000 vs Alen BreatheSmart 75i 1400
- Filter type: Molekule Air Pro PECO-HEPA Tri-Power filter + Activated Carbon (PECO = Photo Electrochemical Oxidation, destroys pollutants) vs Alen BreatheSmart 75i Advanced Particle filter + Medical-grade True HEPA (H13) + Ionizer (switchable); optional Carbon layer (Fresh/Ultimate filters)
- Noise db min: Molekule Air Pro 33 vs Alen BreatheSmart 75i 25
- Energy star: Molekule Air Pro false vs Alen BreatheSmart 75i true
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Molekule Air Pro
Three hands-on testers bench-tested the Molekule Air Pro — Tom's Guide (July 2025), Reviewed/USA Today (Feb 2024) and TechRadar (Sept 2024) — and agree it filters effectively, surfaces detailed multi-pollutant air-quality data on its screen and companion app, and looks premium, but is loud at high fan speeds and very expensive with costly proprietary filters. All three measured high-speed noise (65-78 dB) and confirm the ~$1,000+ price plus roughly $175 twice-yearly filters. FDA Class II medical clearance is confirmed by Reviewed and TechRadar. (3 sourced reviews, 3 lab-tested.)
Praised: Strong, effective filtration; FDA Class II medical clearance; Detailed multi-pollutant air-quality sensing/data via screen and app (VOCs, PM, CO2); Premium, striking aluminum design.
Flagged: Very expensive purchase plus recurring ~$175 filter cost; Loud at high fan speeds (65-78 dB measured across sources); Large, heavy and awkward to carry between rooms.
Alen BreatheSmart 75i
Two whitelisted hands-on reviews (TechHive 2023, TechRadar 2024) cover this exact model. Both are qualitative with no lab-measured numbers. Both praise the powerful airflow for very large rooms (up to ~1,300 sq ft), the swappable colored front panels, and simple onboard controls that work without the app. Both flag the high price, being overkill for small spaces, loud higher/auto fan speeds, bulk, and an app that is hard to find or unintuitive. They split sharply on setup and framing. (2 sourced reviews.)
Praised: Powerful airflow suited to very large rooms (up to ~1,300 sq ft); Swappable colored front panels to match decor; Simple onboard controls, usable without the app.
Flagged: Very expensive and overkill for small spaces; Gets loud at higher/auto fan speeds; Large, bulky footprint.