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.
Sleep/activity signals and vibrating alerts
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.
Scroll across the table to compare every model
| Smart ringsAdd a model |  |  |
|---|---|---|
| Prices · all markets | Price not verified 0 offer records & sourcesNo verified price in this audit. | Price not verified 0 offer records & sourcesNo verified price in this audit. |
| Designed for | Sleep/activity signals and vibrating alerts ↗ | Nighttime biosignals, sleep and daytime motion ↗ |
| Sensors | Infrared/red/green optical LEDs, 3-axis accelerometer, digital temperature ↗ | Not verified |
| Battery / power | Non-replaceable 24-31 mAh Li-ion ↗ | Not verified |
| Material | Not verified | Titanium with PVD or DLC finish depending on colour ↗ |
| Weight | 2 g ↗ | Not verified |
| Controls | Tap-reactive button and vibration motor ↗ | Not verified |
| Form factor | Slim smart ring ↗ | Smart ring; Balance/Heritage styling in one hardware family ↗ |
| Dimensions | 8.8 mm wide × 2.2 mm thick ↗ | Not applicable to this category |
| Memory | Up to 20 days data ↗ | Not applicable to this category |
| Runtime | Up to 5 days ↗ | Not applicable to this category |
| Charging | Approximately 60 minutes ↗ | USB-powered charger with white LED ↗ |
| Wireless | Bluetooth LE 4.2-5.0 ↗ | Not applicable to this category |
| Fit | US 6-13 ↗ | 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 | Maker Slim manual and original physical review verified. Current original-model retail price and stock not established. | Oura explicitly says Gen2 rings and chargers are no longer available for purchase. |
| Important context |
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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.
