Circular · Smart ring
Circular Ring 2
Interesting hardware held back by software; wait for fixes unless ECG is a must.
Our scores
Device scale, not comparable with watch scores: sensor accuracy (HR/HRV/sleep) 30%, battery 15%, recovery & sleep insights 25%, comfort/build 15%, value 15% (subscription cost counts against value). How we score
| Overall | 6.0 / 10 |
|---|---|
| Sensor accuracy (HR/HRV/sleep) | 5.5 |
| Battery | 6 |
| Recovery & sleep insights | 6 |
| Comfort / build | 7 |
| Value (incl. subscription) | 6 |
Device scale: sensor accuracy 5.5, battery 6.0, recovery & sleep insights 6.0, comfort/build 7.0, value 6.0 (subscription cost counts against value).
Meta-review
Consensus strengths
- Only ring here with on-demand ECG
- No mandatory subscription
- Charging case included
Consensus weaknesses
- Unreliable sync and confusing app (TechRadar)
- HR accuracy criticised in COMPUTER BILD test
- Paid add-ons for some insights
Who it's for
Early adopters who specifically want ECG in a ring.
Verdict
Interesting hardware held back by software; wait for fixes unless ECG is a must.
Key specs
| Type | Smart ring |
|---|---|
| Sensors | Single-lead ECG, PPG, skin temperature, accelerometer |
| Battery (claimed) | About 4–5 (performance) to 8 (power mode) days |
| Subscription | No mandatory subscription; some advanced insights are paid |
| GPS | None |
| Weight | — |
| Water rating | IP68 |
| Works with | iOS & Android |
| Price | From $349 · $349 Obsidian Black; Silver $449, Gold/Rose Gold $549 |
What outside reviewers say: Both reviews like the ECG idea and comfort; both flag software and accuracy problems.
Outside reviews we verified
- TechRadar — Circular Ring 2 review: I wanted to love it, but the software got in the way | TechRadar
- COMPUTER BILD — Circular Ring 2 im Test: Schlägt es dank EKG die Konkurrenz? - COMPUTER BILD
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Frequently asked
What is our Circular Ring 2 score?
Circular Ring 2 scores 6.0/10 overall on our device scale (sensor accuracy 5.5, battery 6, recovery & sleep insights 6, comfort / build 7, value 6). Device scale: sensor accuracy 5.5, battery 6.0, recovery & sleep insights 6.0, comfort/build 7.0, value 6.0 (subscription cost counts against value).
How much does Circular Ring 2 cost?
List price starts around $349 USD ($349 Obsidian Black; Silver $449, Gold/Rose Gold $549). Confirm on the maker or retailer page.
Who is Circular Ring 2 for?
Early adopters who specifically want ECG in a ring.
What are alternatives to Circular Ring 2?
Close alternatives on this site include Amazfit Helio Ring, Samsung Galaxy Ring, RingConn Gen 2 Air, Ultrahuman Ring Air, RingConn Gen 2.