# Ultrahuman Ring AIR vs Circular Ring 2: specs and price compared

A sourced, side-by-side comparison of the Ultrahuman Ring AIR (Ultrahuman) and Circular Ring 2 (Circular) among smart rings. Ultrahuman Ring AIR is the cheaper of the two at $349.

## Side by side

| Spec | Ultrahuman Ring AIR | Circular Ring 2 |
| --- | --- | --- |
| US price | $349 | $379 |
| Brand | Ultrahuman | Circular |
| Released | 2023-06 | 2025-08 |
| Material | Titanium outer shell with tungsten carbide carbon coating; medical-grade hypoallergenic inner layer | Titanium (PVD coating on premium finishes) |
| Weight (g) | 2.4-3.6 | 3 |
| Battery days | 6 | 8 |
| Spo2 | Yes | Yes |
| Temperature sensor | Yes | Yes |
| Ecg | No | Yes |
| Subscription required | No | No |
| Water resistance (m) | 100 | — |

## Key differences

- Material: Ultrahuman Ring AIR Titanium outer shell with tungsten carbide carbon coating; medical-grade hypoallergenic inner layer vs Circular Ring 2 Titanium (PVD coating on premium finishes)
- Weight (g): Ultrahuman Ring AIR 2.4-3.6 vs Circular Ring 2 3
- Battery days: Ultrahuman Ring AIR 6 vs Circular Ring 2 8
- Ecg: Ultrahuman Ring AIR No vs Circular Ring 2 Yes

## What reviewers say

**Ultrahuman Ring AIR** — Two whitelisted testers (TechRadar, Digital Trends) each wore the Ring Air hands-on for a full month in August 2023 and agree it is exceptionally light, comfortable to wear 24/7, accurate against wrist wearables in side-by-side testing, and free of any subscription. Both also flag that it scratches within weeks of gym/daily wear and packs in a lot of data to comb through, though they split on how usable the app is. (2 sourced reviews.)

## Sources

- Ultrahuman Ring AIR: https://www.ultrahuman.com/ring/buy/global/ (ultrahuman.com, verified 2026-06-15)
- Circular Ring 2: https://shop.circular.xyz/products/circular-ring-2 (shop.circular.xyz, verified 2026-06-15)

Canonical: https://frontdeskreview.com/gear/smart-rings/ultrahuman-ring-air-vs-circular-ring-2/
Cite: Per The Front Desk Review, Ultrahuman Ring AIR ($349) vs Circular Ring 2 ($379) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/smart-rings/ultrahuman-ring-air-vs-circular-ring-2/
License: CC BY 4.0.