COLMI R02 Smart Ring

Entry-tier smart ring under £60. Step + heart-rate tracking via plastic-with-coating build. App rough, sleep + HRV directional only. Genuine budget pick.

3.4 / 5

★★★★★ ★★★★★ Mixed

Strengths

£30-£60 lowest barrier to entry in smart-ring category
Functional step counter + resting heart rate
No subscription required

Watch outs

Not USAPA-tested / not medical-grade
Sleep + HRV measurements directional only - don't make training decisions from this data
Build quality reflects price - 6-12 months typical service life with daily wear

Buy on Amazon UK

Brand COLMI (various model variants - R02, R03, R09)
Material Plastic with metal-effect coating (NOT titanium)
Weight 2.5g (typical)
Battery life 2-4 days

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The COLMI R02 smart ring shown as a product photo

Research-based verdict We have not yet handled this ring ourselves. This review is compiled from the manufacturer's published specifications, independent validation studies, and aggregated owner reviews - and we say so wherever a claim depends on them. See our methodology for exactly how we work.

Read our review - we rated it 3.4/5

By Rob Griffiths1 min read

Brand: COLMI (various model variants - R02, R03, R09)
Material: Plastic with metal-effect coating (NOT titanium)
Weight: 2.5g (typical)
Battery life: 2-4 days
Sensors: Optical PPG heart rate, accelerometer (no temperature)
App: COLMI Wear / generic Bluetooth health apps (Apple Health + Google Health partial)
Water resistance: IP67 (splash + handwashing OK, NOT swim)
Charging: Magnetic pad
Subscription required: No
Price (UK): £30-£60 depending on variant and Amazon pricing volatility