COLMI R12 Smart Ring Review: The First Budget Smart Ring With a Touchscreen Display

The COLMI R12 Smart Ring breaks new ground in the budget wearable category by doing something no other affordable smart ring has done: it puts a touchscreen display on your finger. Every other smart ring on the market — at any price — requires you to reach for your phone to check your health data. The R12 changes that, allowing you to view key metrics directly on the ring itself with a tap. It's a significant innovation, and in this review we examine whether it works as advertised, how the health tracking compares to other COLMI rings, and who should buy it.

Why a Display on a Smart Ring Matters

The most common complaint about smart rings — even from people who love them — is that checking your data requires pulling out your phone. You want to glance at your step count mid-walk, check your heart rate after a short run, or see your stress score during a tense moment at work, and every time you have to unlock your phone, open the Da Fit app, and navigate to the right screen. For passive overnight sleep tracking this doesn't matter. But for active daytime use, the friction adds up.

The R12's touchscreen display addresses this directly. A small, bright screen on the outer face of the ring displays key health metrics on demand with a tap. You can check your step count, current heart rate, SpO2, and other core stats from the ring itself, without your phone anywhere nearby. This bridges the gap between the no-display simplicity of a traditional smart ring and the full interface of a smartwatch — giving you the best aspects of both form factors in a single wearable.

Design and Build Quality

The R12 is necessarily slightly bulkier than other COLMI smart rings because it needs to accommodate both the sensor array and the display electronics within the ring body. The result is a ring that's noticeably thicker than the R09 or R07, though it remains far slimmer than any smartwatch. The display sits flush with the outer surface and is surrounded by a smooth bezel that protects the screen from casual impacts during daily wear.

Available in multiple colour finishes including Silver, Black, and Gold, the R12 has a more technological aesthetic than other rings in the COLMI lineup — the visible screen makes it unmistakably a smart device rather than jewellery, which suits some users and may not suit others. If you want a ring that looks purely like jewellery, the R09 or R11 are better choices. If you want the most tech-forward option in the lineup, the R12 is it.

The ring is IP68 water resistant, handling daily moisture exposure without issue. As with all COLMI rings, the sizing must be accurate for both comfort and sensor performance — use the sizing guide before ordering. The R12 is available in standard ring sizes to accommodate most finger dimensions.

The Touchscreen Display: How It Works

The display on the R12 is small — necessarily so, given the form factor — but it's bright enough to read clearly in most lighting conditions. A single tap on the screen activates the display, which cycles through available metric screens with subsequent taps or a swipe gesture. The interface is minimal by design: the screen shows one or two metrics per view with large, readable digits rather than trying to replicate a smartwatch interface on a finger-sized screen.

Available metric views on the display include current heart rate, step count, SpO2 reading (triggered on demand), time and date, and activity data. The display is not intended for reading notifications — text messages, calls, and app alerts still require your phone. The R12 is a health data display, not a notification mirror, which is an important distinction to understand before purchasing.

The touchscreen is responsive to deliberate taps but doesn't trigger accidentally during normal hand movements, which is a sensible design decision for a screen that's always in contact with other surfaces throughout the day. The auto-off timeout is quick to preserve battery life, so the display is dark by default and only lights on demand.

Health Monitoring Features

The R12 delivers the most comprehensive health monitoring suite in the COLMI smart ring range:

Continuous Heart Rate Monitoring

24/7 optical heart rate monitoring runs continuously, with the sensor positioned on the inner surface of the ring against the finger. Real-time heart rate is viewable on the ring's display with a tap, or in detailed trend form in the Da Fit app. High and low heart rate alerts are configurable. The finger location provides excellent sensor contact and produces stable, reliable readings throughout the day and night.

Blood Oxygen (SpO2) Monitoring

SpO2 measurements can be triggered both from the ring's touchscreen display and via the Da Fit app. The measurement takes approximately 30 seconds with the ring in a still position and provides blood oxygen saturation readings accurate to within 2–3% of clinical reference devices under ideal conditions. Historical SpO2 data is stored in the app for trend review.

Sleep Tracking

Automatic sleep detection activates when you fall asleep, tracking light, deep, and REM stages throughout the night. A morning sleep quality score and stage breakdown are displayed in the Da Fit app. Sleep duration is accurately captured, and stage classification provides a useful overview of sleep quality, though not at clinical polysomnography accuracy levels. The R12's slightly thicker profile compared to lighter rings like the R09 may be less comfortable for some overnight wearers — individual tolerance varies.

Stress Monitoring via HRV

Heart rate variability analysis generates ongoing stress scores throughout the day, viewable in the Da Fit app. This provides a useful passive indicator of autonomic nervous system state and can help identify patterns of accumulated stress or poor recovery over time. The stress score is not displayed on the ring itself in the current firmware but is accessible via the app.

Step Counting and Activity Tracking

Daily steps, estimated calorie burn, and active distance are tracked automatically and can be checked on the ring's display with a tap — this is one of the most practically useful aspects of having the screen, allowing quick step count checks without reaching for your phone during a walk or work break. Step goals are set in the Da Fit app.

Menstrual Cycle Tracking

Female users can log and track their menstrual cycle through the companion app, with continuous health data providing physiological context around cycle phases and their impact on sleep, HRV, and resting heart rate.

Battery Life

The touchscreen display naturally has an impact on battery consumption. The R12 delivers approximately 3 to 5 days of battery life under typical use with monitoring enabled and the display used regularly throughout the day. This is somewhat shorter than the standard COLMI ring battery life of 5 to 7 days, but is entirely acceptable for a device that includes an active display — and far exceeds most smartwatches at any price point.

If you primarily use the display for quick checks several times a day rather than continuous viewing, the battery life will be closer to the higher end of this range. Disabling the display or using it only sparingly can extend life further. Charging is via the standard magnetic cable and takes approximately 1 to 1.5 hours for a full charge.

Da Fit Companion App

The R12 pairs with the Da Fit app (free, iOS and Android) via Bluetooth. The app provides the full health data dashboard, historical trend storage, and configuration options for the ring's health monitoring features. The experience is consistent with other COLMI devices — clean, well-organised, and functional without being exceptional in terms of data interpretation depth.

No subscription is required for any data access on the Da Fit app, and historical records are stored indefinitely. This is a meaningful advantage over premium competitors that gate long-term data access behind subscription paywalls. The R12 can also sync to Apple Health or Google Fit for consolidated health data management.

COLMI R12 vs Other COLMI Smart Rings

R12 vs R02/R03 (Entry-Level)

The R02 and R03 provide the same core health monitoring at a lower price without the touchscreen display. If you don't need to view data on the ring itself, the R02 or R03 save you money with identical health tracking. If the ability to check stats without your phone is important, the R12's premium is justified.

R12 vs R07 (Battery Life)

The R07's 30-day battery life versus the R12's 3 to 5 days is a significant trade-off. If charging every week or more is something you want to minimise, the R07 is the vastly superior choice on that metric. The R12 wins on display functionality; the R07 wins on autonomy. They serve different priorities.

R12 vs R09 (Comfort)

The R09's concave lightweight design makes it the most comfortable ring for overnight wear. The R12's thicker profile is less optimal for all-night use compared to the R09. If sleep tracking comfort is your primary concern, the R09 is the better choice. If daytime data access convenience is more important, the R12 is worth the slightly less optimal overnight profile.

R12 vs COLMI P71 Smartwatch

The P71 smartwatch at a similar price point offers a full display, notifications, and Bluetooth calling that the R12 cannot match. The R12 offers a more comfortable form factor for all-day wear, better resting heart rate accuracy from the finger location, and a more discreet appearance. If display functionality is your top priority, a smartwatch serves you better. If you prefer the ring form factor with added display convenience, the R12 is the right choice.

Who Should Buy the COLMI R12?

• Smart ring enthusiasts who want data access without constantly reaching for their phone
• Tech-forward users who want the most feature-complete ring in the COLMI range
• People who primarily want quick step count and heart rate checks during the day without a smartwatch
• Users who want the ring form factor's comfort and discretion advantages with some display functionality
• Those upgrading from another COLMI ring who want more on-device accessibility

Who Should Choose a Different COLMI Ring?

• If battery life above all else matters — choose the R07 (30 days)
• If swimming is a priority — choose the R06 (5ATM waterproofing)
• If maximum overnight comfort is the goal — choose the R09 (lightest, concave design)
• If you want a stress-relief spinner alongside health tracking — choose the R11
• If budget is tight and you don't need the display — choose the R02 or R03

Verdict

The COLMI R12 is the most technologically advanced ring in the COLMI smart ring lineup and represents a genuine step forward for affordable smart rings. The touchscreen display is well-implemented, practically useful, and doesn't meaningfully compromise the health tracking quality that defines the rest of the R-series. The slightly shorter battery life and marginally thicker profile are reasonable trade-offs for the display functionality.

If you've been on the fence about smart rings because of the no-display limitation, the R12 makes a compelling case. It delivers the comfort and discretion advantages of a ring form factor while giving you direct data access that has previously only been available on smartwatches.

Rating: 4.4 / 5 — The most innovative budget smart ring available. The touchscreen display is a genuine quality-of-life improvement that sets it apart from every competitor at this price point.