Rabbit Air
Rabbit Air BioGS 2.0
$369.95Cheaper
Released 2017
Best Air Purifiers · head-to-head
Rabbit Air BioGS 2.0 vs Alen BreatheSmart 75i
A sourced, side-by-side comparison. Rabbit Air BioGS 2.0 is cheaper at $369.95. Every spec and price links to its source.
Alen
Alen BreatheSmart 75i
$799
Which is better: the Rabbit Air BioGS 2.0 or Alen BreatheSmart 75i?
On the specs we track, they're closely matched. The Rabbit Air BioGS 2.0 is the cheaper at $369.95.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Rabbit Air BioGS 2.0 | Alen BreatheSmart 75i |
|---|---|---|
| US price | $369.95 | $799 |
| Brand | Rabbit Air | Alen |
| Released | 2017 | — |
| Cadr smoke (CFM) | 136 | — |
| Coverage (sq ft) | 550 | 1400 |
| Hepa | Yes | Yes |
| Filter type | Pre-filter + BioGS HEPA + Dual Hive AC Charcoal + Negative Ion Generator (4-stage) | Advanced Particle filter + Medical-grade True HEPA (H13) + Ionizer (switchable); optional Carbon layer (Fresh/Ultimate filters) |
| Noise db min | 22.8 | 25 |
| Smart | No | Yes |
| Energy star | No | Yes |
| Release | 2017 | — |
Sources — Rabbit Air BioGS 2.0: rabbitair.com (verified 2026-06-15). Alen BreatheSmart 75i: alen.com (verified 2026-07-07).
What's the difference between the Rabbit Air BioGS 2.0 and Alen BreatheSmart 75i?
Where the two actually differ on the specs we track (5 of 7). Matching specs are omitted.
- Coverage (sq ft): Rabbit Air BioGS 2.0 550 vs Alen BreatheSmart 75i 1400
- Filter type: Rabbit Air BioGS 2.0 Pre-filter + BioGS HEPA + Dual Hive AC Charcoal + Negative Ion Generator (4-stage) vs Alen BreatheSmart 75i Advanced Particle filter + Medical-grade True HEPA (H13) + Ionizer (switchable); optional Carbon layer (Fresh/Ultimate filters)
- Noise db min: Rabbit Air BioGS 2.0 22.8 vs Alen BreatheSmart 75i 25
- Smart: Rabbit Air BioGS 2.0 false vs Alen BreatheSmart 75i true
- Energy star: Rabbit Air BioGS 2.0 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.
Rabbit Air BioGS 2.0
Only one whitelisted tester, Tom's Guide, hands-on reviewed this exact model. It calls the BioGS 2.0 a quiet, inexpensive purifier that cleans a mid-sized room well, but flags weak airflow and the absence of WiFi or an app. Consensus rests on a single source. (1 sourced review, 1 lab-tested.)
Praised: Quiet operation — peak wind noise measured at 56 dBA, far below noisier rivals; Inexpensive at $369, roughly half the price of comparable purifiers; Simple to operate with a remote control and a fast-reacting auto mode.
Flagged: Low airflow that pales next to the best in its class; No WiFi, app, or Alexa/Google Home integration; Lacks a tip-over safety switch.
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.