# Wellue O2Ring vs Nonin Onyx Vantage 9590: specs and price compared

A sourced, side-by-side comparison of the Wellue O2Ring (Wellue (Viatom)) and Nonin Onyx Vantage 9590 (Nonin Medical) among pulse oximeters. Wellue O2Ring is the cheaper of the two at $152.9.

## Side by side

| Spec | Wellue O2Ring | Nonin Onyx Vantage 9590 |
| --- | --- | --- |
| US price | $152.9 | $199 |
| Brand | Wellue (Viatom) | Nonin Medical |
| Spo2 range | 70-100% | 0-100% |
| Spo2 accuracy percent | ±2% (80-100%), ±3% (70-79%) | 70-100% Arms ±2 digits (finger/thumb, no motion); toe accuracy ±2 (70-90%) / ±3 (90-100%) |
| Pulse rate range bpm | 30-250 bpm | 18-321 bpm display; declared accuracy 20-250 bpm ±3 digits (40-240 bpm ±3 digits low perfusion) |
| Display type | On-ring digital display with app-adjustable brightness | Numeric LED display with tricolor pulse-quality indicator |
| Perfusion index | — | No |
| Continuous monitoring | Yes | No |
| Bluetooth | Yes | No |
| Battery life hr | 16 | 36 |

## Key differences

- Spo2 range: Wellue O2Ring 70-100% vs Nonin Onyx Vantage 9590 0-100%
- Spo2 accuracy percent: Wellue O2Ring ±2% (80-100%), ±3% (70-79%) vs Nonin Onyx Vantage 9590 70-100% Arms ±2 digits (finger/thumb, no motion); toe accuracy ±2 (70-90%) / ±3 (90-100%)
- Pulse rate range bpm: Wellue O2Ring 30-250 bpm vs Nonin Onyx Vantage 9590 18-321 bpm display; declared accuracy 20-250 bpm ±3 digits (40-240 bpm ±3 digits low perfusion)
- Display type: Wellue O2Ring On-ring digital display with app-adjustable brightness vs Nonin Onyx Vantage 9590 Numeric LED display with tricolor pulse-quality indicator
- Continuous monitoring: Wellue O2Ring Yes vs Nonin Onyx Vantage 9590 No
- Bluetooth: Wellue O2Ring Yes vs Nonin Onyx Vantage 9590 No
- Battery life hr: Wellue O2Ring 16 vs Nonin Onyx Vantage 9590 36

## Sources

- Wellue O2Ring: https://getwellue.com/products/o2ring-wearable-pulse-oximeter (getwellue.com, verified 2026-08-01)
- Nonin Onyx Vantage 9590: https://www.nonin.com/wp-content/uploads/2018/09/Instructions-for-Use-9590.pdf (nonin.com, verified 2026-08-01)

Canonical: https://frontdeskreview.com/gear/pulse-oximeters/wellue-o2ring-vs-nonin-onyx-vantage-9590/
Cite: Per The Front Desk Review, Wellue O2Ring ($152.9) vs Nonin Onyx Vantage 9590 ($199) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/pulse-oximeters/wellue-o2ring-vs-nonin-onyx-vantage-9590/
License: CC BY 4.0.