Compare up to 10 devices across categories. Keep the purpose and the source beside the numbers.
Lowest recorded store prices take priority over announced or launch prices, within the selected source market. Currencies use the dated EUR reference rates. Deposits and recurring charges are excluded from price order; missing prices stay last. Original price records remain visible.
Budget app-linked sleep and activity tracking
Keep in mind Wellness signals and app-derived sleep/activity scores are not a medical diagnosis. Fit, firmware and personal physiology affect readings.
Nighttime biosignals, sleep and daytime motion
Keep in mind Wellness signals and app-derived sleep/activity scores are not a medical diagnosis. Fit, firmware and personal physiology affect readings.
Published specifications and documented constraints. See the full comparison below for prices and sources.
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| Smart ringsAdd a model |  |  |
|---|---|---|
| Prices · all markets | $59.98 USD≈ €54 EURECB 2026-10-12US · Listed price · Displayed listing; merchant authorization, variant stock and checkout unverified 1 offer records & sources$59.98 USD≈ €54 EURECB 2026-10-12 US · Listed price Displayed listing; merchant authorization, variant stock and checkout unverifiedCOLMI.info storefront R02 smart ring displayed standard listing COLMI.info displays $59.98 in US/USD locale. Storefront also carries an Amazon affiliate disclosure; not asserted as an authorized manufacturer store or in-stock checkout offer.Check merchant offer ↗Price source ↗ Checked 2026-10-12 | Price not verified 0 offer records & sourcesNo verified price in this audit. |
| Designed for | Budget app-linked sleep and activity tracking ↗ | Nighttime biosignals, sleep and daytime motion ↗ |
| Sensors | Listing names STK8321 motion sensor and Vcare VC30F heart-rate sensor ↗ | Not verified |
| Battery / power | 15 mAh lithium-polymer listing specification ↗ | Not verified |
| Material | Not verified | Titanium with PVD or DLC finish depending on colour ↗ |
| Thickness | 2.7 mm listing specification ↗ | Not verified |
| Form factor | Smart ring ↗ | Smart ring; Balance/Heritage styling in one hardware family ↗ |
| Wireless | Bluetooth LE 5.0 listing specification ↗ | Not applicable to this category |
| Charging | Magnetic charging cable ↗ | USB-powered charger with white LED ↗ |
| Software | QRing phone app ↗ | Not applicable to this category |
| Compatibility | Listing states Android 5.1+ / iOS 8+ ↗ | Not applicable to this category |
| Leds | Not applicable to this category | Infrared LEDs for nighttime sensing ↗ |
| Motion | Not applicable to this category | Accelerometers ↗ |
| Temperature | Not applicable to this category | NTC temperature sensors ↗ |
| Measurement | Not applicable to this category | Nighttime resting HR, HRV, skin temperature and respiratory-rate estimates ↗ |
| Availability | Named COLMI.info storefront listing and original physical R02 review verified. Maker authorization and exact current hardware revision not independently established. | Oura explicitly says Gen2 rings and chargers are no longer available for purchase. |
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| Editorial pick & release | No editorial ranking recorded | No editorial ranking recorded |
| Evidence | Manufacturer source Checked 2026-10-13 | Manufacturer source Checked 2026-10-13 |
Battery claims use different conditions and are not a controlled benchmark. “Not verified” is an evidence gap, not a missing feature. Prices are dated regional snapshots. Deposits, bundles and historical launch prices are labelled. Brightness measurement methods and battery workloads vary by manufacturer.
