Both are subscription-free rings that push into heart-health territory, but they differ on a crucial point: whether the features work. The Circular Ring 2 has the more ambitious hardware — on-finger ECG and AFib detection — but its software is unfinished and those features didn’t reliably work in testing. The RingConn Gen 3 aims lower (vascular and blood-pressure trends, sleep-apnea insights, a haptic alarm) but delivers what it promises today.
VERDICT: TIE
Ambition that doesn’t work yet vs features that do. The Circular Ring 2 has unique ECG/AFib hardware, but unfinished software and unreliable performance in testing. The RingConn Gen 3 offers vascular/sleep-apnea insights and a haptic alarm that actually ship, with a longer battery and proven reliability — at a similar subscription-free price. Today, RingConn is the safer buy.
RingConn’s vascular/sleep-apnea insights and haptic alerts ship and work. The Circular’s ECG/AFib didn’t reliably work in independent testing.
RingConn Gen 3
Unique hardware
The Circular’s on-finger ECG and AFib detection are unique in the category — if they mature.
Circular Ring 2
Subscription
Tie — both are subscription-free.
Tie
Battery
RingConn Gen 3: ~10-14 days plus a wireless charging case. Circular Ring 2: ~6 days. RingConn lasts much longer.
RingConn Gen 3
Reliability & polish
RingConn is proven and well-reviewed; the Circular’s software was the main thing reviewers criticised.
RingConn Gen 3
Price
Both start around $349 (Circular’s higher finishes cost more). Similar money — the difference is what you actually get working.
Tie
Choose Circular Ring 2
Choose the Circular Ring 2 only if on-ring ECG/AFib specifically matters to you and you accept unfinished software as an early adopter.
Choose RingConn Gen 3
Choose the RingConn Gen 3 if you want subscription-free heart-health insights, a haptic silent alarm and a long battery that all work today.
The short version
Two subscription-free rings chasing heart health. The Circular Ring 2 has unique on-ring ECG/AFib but unfinished software; the RingConn Gen 3 offers vascular/sleep-apnea insights and a haptic alarm that actually ship, with a longer battery.
When the Circular Ring 2 is the right pick
On-ring ECG/AFib specifically matters to you, and you accept unfinished software as an early adopter.
When the RingConn Gen 3 is the right pick
You want subscription-free heart-health features, a haptic alarm and a long battery that all work today.
For a subscription-free ring with heart-health features that work today — vascular/sleep-apnea insights, a haptic alarm, long battery — the RingConn Gen 3. The Circular Ring 2 has more ambitious ECG/AFib hardware, but it didn’t reliably work in testing and the software is unfinished. RingConn is the safer buy right now.
Does the Circular have ECG that RingConn lacks?
Yes — on paper. The Circular has on-finger ECG and AFib detection, which RingConn doesn’t. But those Circular features didn’t reliably work in independent testing, so the advantage is theoretical until the software matures.
Which has better battery?
The RingConn Gen 3, clearly — around 10-14 days plus a wireless charging case, versus the Circular’s ~6 days.