ARX Omni vs COSMED K5
Specs, prices, editor verdict, and who should buy which - compared side-by-side.
ARX Omni (ultra premium, $20,000–$28,000) vs COSMED K5 (ultra premium, $35,000–$50,000) - different tools for different jobs (see the per-product details below).
Compared on 1 shared spec · same category (ultra premium).
These are close picks. Both score in the same range. The right call depends on buyer profile - read the per-buyer recommendations below.
Side-by-side specs
| Spec | ARX Omni | COSMED K5 |
|---|---|---|
| price | $20,000–$28,000 | $35,000–$50,000 |
| type | Motorized adaptive resistance machine | Portable breath-by-breath metabolic analyzer |
ARX Omni also publishes: sessionTime, sessionsPerWeek, footprint, power
COSMED K5 also publishes: measurements, portability, battery, accuracy, warranty
Who should buy which
Time-compressed founders, longevity-focused buyers wanting strength training in 12 min/week, home wellness installs with strength as a priority. The Tim Ferriss / Peter Attia tier.
You enjoy traditional gym training and have 3-5 hours/week for it. You don't want a single-purpose ~$25K piece of equipment.
Family offices with multiple longevity-focused members. Private trainers / coaches serving HNW clients. Buyers who specifically want the gold-standard measurement quality, not the wearable-estimated version.
You only need 1-2 VO2 measurements per year (use a clinic). You don't want B2B-tier purchasing complexity (annual calibration contract, occasional service visits).
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Frequently asked
Which is better, the ARX Omni or the COSMED K5?
They are closely matched on our scoring, so the right pick comes down to your priorities. The verdict and spec table above compare them on price, features, and who each one suits.
How much do they cost?
ARX Omni: $20,000 to $28,000. COSMED K5: $35,000 to $50,000. Prices are verified against the manufacturer; check the live links for current pricing.
Who should buy which one?
ARX Omni: Time-compressed founders, longevity-focused buyers wanting strength training in 12 min/week, home wellness installs with strength as a priority. The Tim Ferriss / Peter Attia tier. COSMED K5: Family offices with multiple longevity-focused members. Private trainers / coaches serving HNW clients. Buyers who specifically want the gold-standard measurement quality, not the wearable-estimated version.