# Oura Ring 4 vs Luna Ring Gen 2: specs and price compared

A sourced, side-by-side comparison of the Oura Ring 4 (Oura) and Luna Ring Gen 2 (Noise) among smart rings. Luna Ring Gen 2 is the cheaper of the two at $300.

## Side by side

| Spec | Oura Ring 4 | Luna Ring Gen 2 |
| --- | --- | --- |
| US price | $349 | $300 |
| Brand | Oura | Noise |
| Released | 2024-10 | 2025-07 |
| Material | Titanium (non-allergenic inner and outer surfaces) | Fighter jet-grade titanium with PVD coating and non-allergenic inner molding |
| Weight (g) | 3.3-5.2 | 3-5 |
| Battery days | 8 | 6 |
| Spo2 | Yes | Yes |
| Temperature sensor | Yes | Yes |
| Ecg | No | No |
| Subscription required | Yes | No |
| Water resistance (m) | 100 | 50 |

## Key differences

- Material: Oura Ring 4 Titanium (non-allergenic inner and outer surfaces) vs Luna Ring Gen 2 Fighter jet-grade titanium with PVD coating and non-allergenic inner molding
- Weight (g): Oura Ring 4 3.3-5.2 vs Luna Ring Gen 2 3-5
- Battery days: Oura Ring 4 8 vs Luna Ring Gen 2 6
- Subscription required: Oura Ring 4 Yes vs Luna Ring Gen 2 No
- Water resistance (m): Oura Ring 4 100 vs Luna Ring Gen 2 50

## What reviewers say

**Oura Ring 4** — Four testers (Tom's Guide, TechRadar, Engadget, Digital Trends) all hands-on-tested the Oura Ring 4 and call it the best smart ring you can buy, praising the all-titanium comfort and companion app. Every source flags the mandatory ~$5.99/month subscription; easy scratching and step/calorie/activity-detection accuracy are the recurring doubts across reviews. (4 sourced reviews.)

## Sources

- Oura Ring 4: https://ouraring.com/store/rings/oura-ring-4 (ouraring.com, verified 2026-06-15)
- Luna Ring Gen 2: https://www.lunazone.com/products/luna-smart-ring-gen-2 (lunazone.com, verified 2026-06-15)

Canonical: https://frontdeskreview.com/gear/smart-rings/oura-ring-4-vs-luna-ring-gen-2/
Cite: Per The Front Desk Review, Oura Ring 4 ($349) vs Luna Ring Gen 2 ($300) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/smart-rings/oura-ring-4-vs-luna-ring-gen-2/
License: CC BY 4.0.