Oura Ring 5
vs Circular Ring 2
At a glance: the Oura Ring 5 ($399, shipping since 2026) against the Circular Ring 2 ($349, shipping since 2026). The Circular Ring 2 is $50 cheaper than the Oura Ring 5. Only the Ring 5 has Blood pressure (signals); only the Ring 2 has ECG (single-lead). They share 4 of the same capabilities.
The world's smallest smart ring — roughly 40% smaller, week-long battery and new blood-pressure signals.
Titanium ring built around an on-finger single-lead ECG with AFib detection and PPG-based blood-pressure estimation.
Side by side
| Oura Ring 5 | Circular Ring 2 | |
|---|---|---|
| Company | Oura | Circular |
| Category | RING | RING |
| Worn | Finger | Finger |
| Compared model | Ring 5 | Ring 2 |
| Release | 2026 | 2026 |
| Status | SHIPPING | SHIPPING |
| Price | $399 | $349 |
| Generations tracked | 3 | 1 |
| Biometric | PPG heart rate (next-gen), Skin temperature, Blood oxygen (SpO₂), Blood pressure (signals) | ECG (single-lead), PPG heart rate, Blood oxygen (SpO₂), Skin temperature |
| Motion | Accelerometer | Accelerometer |
Where they differ
Only the Ring 5
- Blood pressure (signals)
Only the Ring 2
- ECG (single-lead)
Both
- PPG heart rate (next-gen)
- Skin temperature
- Blood oxygen (SpO₂)
- Accelerometer
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Independent comparison — figures are approximate and editorial, not official spec sheets. Methodology. Last reviewed 2026-08-01.