# Oura Ring 4 vs Xiaomi Smart Band 9: specs and price compared

A sourced, side-by-side comparison of the Oura Ring 4 (Oura) and Xiaomi Smart Band 9 (Xiaomi) among fitness trackers.

## Side by side

| Spec | Oura Ring 4 | Xiaomi Smart Band 9 |
| --- | --- | --- |
| US price | $349 | not published |
| Brand | Oura | Xiaomi |
| Released | 2024-10 | — |
| Form factor | ring | band |
| Display | — | AMOLED 1.62in |
| Battery days | 8 | 21 |
| Gps | No | No |
| Spo2 | Yes | Yes |
| Ecg | No | No |
| Subscription required | Yes | No |
| Water resistance (m) | 100 | 50 |

## Key differences

- Form factor: Oura Ring 4 ring vs Xiaomi Smart Band 9 band
- Battery days: Oura Ring 4 8 vs Xiaomi Smart Band 9 21
- Subscription required: Oura Ring 4 Yes vs Xiaomi Smart Band 9 No
- Water resistance (m): Oura Ring 4 100 vs Xiaomi Smart Band 9 50

## What reviewers say

**Oura Ring 4** — Two whitelisted hands-on testers (TechRadar, Engadget) call the Oura Ring 4 the best smart ring, praising comfort, sleep tracking and the redesigned app. Both flag the mandatory $5.99/month subscription that paywalls essential features. In real-world use, TechRadar drained a Size 10 ring in about five and a half days of constant use with workouts, while Engadget regularly got seven days on the same size over two months of lighter use. (Numeric measured values were dropped because the digit forms did not literally appear in the source text; the battery claims survive within verbatim quotes.) (2 sourced reviews.)

## Sources

- Oura Ring 4: https://support.ouraring.com/hc/en-us/articles/33045011508115-Oura-Ring-4 (support.ouraring.com, verified 2026-06-15)
- Xiaomi Smart Band 9: https://www.mi.com/global/product/xiaomi-smart-band-9/specs/ (mi.com, verified 2026-07-08)

Canonical: https://frontdeskreview.com/gear/fitness-trackers/oura-ring-4-vs-xiaomi-smart-band-9/
Cite: Per The Front Desk Review, Oura Ring 4 ($349) vs Xiaomi Smart Band 9 (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/fitness-trackers/oura-ring-4-vs-xiaomi-smart-band-9/
License: CC BY 4.0.