Circular
Circular Ring 2
$379
Released 2025-08
Best Smart Rings · head-to-head
Circular Ring 2 vs Luna Ring Gen 2
A sourced, side-by-side comparison. Luna Ring Gen 2 is cheaper at $300. Every spec and price links to its source.
Noise
Luna Ring Gen 2
$300Cheaper
Released 2025-07
Which is better: the Circular Ring 2 or Luna Ring Gen 2?
On the specs we track, they're closely matched. The Luna Ring Gen 2 is the cheaper at $300.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Circular Ring 2 | Luna Ring Gen 2 |
|---|---|---|
| US price | $379 | $300 |
| Brand | Circular | Noise |
| Released | 2025-08 | 2025-07 |
| Material | Titanium (PVD coating on premium finishes) | Fighter jet-grade titanium with PVD coating and non-allergenic inner molding |
| Weight (g) | 3 | 3-5 |
| Battery days | 8 | 6 |
| Spo2 | Yes | Yes |
| Temperature sensor | Yes | Yes |
| Ecg | Yes | No |
| Subscription required | No | No |
| Water resistance (m) | — | 50 |
Sources — Circular Ring 2: shop.circular.xyz (verified 2026-06-15). Luna Ring Gen 2: lunazone.com (verified 2026-06-15).
What's the difference between the Circular Ring 2 and Luna Ring Gen 2?
Where the two actually differ on the specs we track (4 of 8). Matching specs are omitted.
- Material: Circular Ring 2 Titanium (PVD coating on premium finishes) vs Luna Ring Gen 2 Fighter jet-grade titanium with PVD coating and non-allergenic inner molding
- Weight (g): Circular Ring 2 3 vs Luna Ring Gen 2 3-5
- Battery days: Circular Ring 2 8 vs Luna Ring Gen 2 6
- Ecg: Circular Ring 2 true vs Luna Ring Gen 2 false