The subscription-free promise that drew backers may not survive the roadmap.
At the intersection of personal health and wearable technology, two identically priced smart rings—the established Oura Ring 4 and the upstart Circular Ring 2—invite consumers to consider not just what a device measures, but what it costs to know oneself over time. The Oura carries a monthly subscription that compounds its sticker price, while Circular promises freedom from recurring fees, though that promise grows more conditional as its roadmap unfolds. In the end, the more seasoned device wins on depth and comfort, but the challenger raises questions about cardiac monitoring and battery endurance that the category leader has yet to fully answer.
- Two rings, identical in price at $349, are locked in a quiet but consequential battle over who owns the future of finger-worn health tracking.
- Oura's $5.99 monthly subscription quietly inflates its true cost, while Circular's 'free forever' promise is already developing asterisks around upcoming features like blood pressure and glucose monitoring.
- Circular draws blood with a genuine differentiator—ECG readings and atrial fibrillation detection—capabilities the Oura Ring 4 simply cannot match today, giving heart-conscious users a real reason to look elsewhere.
- Real-world battery testing exposes Oura's advertised eight days as closer to six, while Circular delivers seven, and its fast-charging case closes the gap further in daily life.
- Despite Circular's advantages in battery and cardiac sensing, Oura's superior durability, comfort, analytical depth, and forty-workout tracking library keep it atop the smart ring hierarchy for now.
Two smart rings arrived at the same price point—$349 each—but with very different stories to tell. The Oura Ring 4 is the category's established standard-bearer. The Circular Ring 2 is a Kickstarter-born challenger, newer and still earning its credibility, but carrying features its rival cannot yet match.
The subscription question is where the choice gets personal. Oura charges $5.99 a month to unlock its app's full potential—a cost that accumulates quietly over years. Circular keeps its core features free: sleep tracking, vitals, energy scoring, women's health. But forthcoming capabilities like blood pressure and glucose monitoring will likely require payment when they arrive in late 2025 and early 2026. Circular frames these as stretch goals beyond the original campaign promise, but the subscription-free identity that attracted early backers is already under pressure.
Physically, both rings are titanium, but Oura wears better—its sensors sit flush against the skin, while Circular's protrude slightly, leaving faint marks on the finger and scratching more easily. Circular answers with a fast-charging case that reaches full battery in thirty minutes. Oura leads on water resistance, rated to 100 meters versus Circular's 50.
On health tracking, the picture splits. Oura offers deeper, more granular insights and recognizes forty workout types automatically. Circular counters with ECG readings and atrial fibrillation detection—capabilities Oura currently lacks entirely—making it a more compelling choice for anyone monitoring heart rhythm. Neither ring has onboard GPS.
Battery life tells a revealing story: both claim eight days, but Oura delivers roughly six in real use, while Circular manages about seven. That extra day, paired with fast charging, gives Circular a meaningful practical edge.
The verdict favors Oura—its design, comfort, health depth, and fitness sophistication add up to a more complete experience. But Circular is not easily dismissed. Its longer real-world battery, cardiac monitoring features, and subscription-free core represent genuine value. Whether Oura responds with firmware updates or a next-generation device, the competitive pressure is real—and the smart ring category is better for it.
Two smart rings arrived at roughly the same moment in the market, priced identically at $349, each claiming to be the thinking person's choice for finger-worn health tracking. The Oura Ring 4 has already earned its reputation as the category's most refined option. The Circular Ring 2, meanwhile, is still proving itself—a newer entrant that launched via Kickstarter earlier this year, carrying the promise of subscription-free operation and some genuinely distinctive features that Oura doesn't yet offer.
The subscription question cuts to the heart of the choice. Oura demands $5.99 monthly to unlock the full potential of its app, a recurring cost that compounds over time. Circular, by contrast, keeps its core features free—sleep tracking, vitals monitoring, energy scoring, women's health insights—all without a paywall. The catch, which has understandably rankled early backers, is that forthcoming capabilities like blood pressure and glucose monitoring will likely require payment when they arrive in late 2025 and early 2026. Circular's defense is straightforward: these were never part of the original promise, only "stretch goals" added after the campaign succeeded. Still, the subscription-free positioning that drew backers to the platform may not survive contact with the company's roadmap.
Beyond pricing, the rings diverge in meaningful ways. Both are titanium throughout, but the Circular's exterior shows scratches more readily after just a week of wear. The Oura feels more comfortable against skin—its sensors sit recessed, while Circular's protrude slightly, leaving faint indentations on the finger. Circular compensates with a faster charging case that reaches full battery in thirty minutes, a genuine convenience. On water resistance, Oura pulls ahead with 100-meter rating versus Circular's 50 meters, a difference that matters if you plan to dive or engage in high-impact water sports.
The health tracking picture is more nuanced. Both rings monitor heart rate, blood oxygen, body temperature, and movement. Oura's insights are deeper and more granular, covering a wider range of metrics with greater analytical depth. But Circular offers something Oura doesn't: ECG readings and atrial fibrillation detection, capabilities that speak directly to cardiac health in ways the Oura Ring 4 currently cannot. For fitness, Oura dominates—it recognizes and tracks forty different workout types automatically, while Circular manages only basic activities like walking and running. Neither has onboard GPS, so you'll carry your phone regardless.
Battery life reveals real-world performance gaps. Both advertise eight days per charge, but testing shows the Oura Ring 4 actually delivers closer to six days, while the Circular Ring 2 achieves approximately seven. That extra day of runtime, combined with the fast-charging case, gives Circular a practical edge in daily use.
When the scorecard is tallied, the Oura Ring 4 emerges as the stronger overall device. Its design is more durable and comfortable. Its health insights are more comprehensive. Its fitness tracking is more sophisticated. It comes in more sizes and finishes. The monthly subscription fee stings, but the accumulated advantages justify the cost for most users seeking a mature, well-rounded smart ring.
Yet Circular's position is not weak. Its battery lasts longer in real conditions. Its ECG and AFib detection represent genuine differentiation—capabilities that could prove medically valuable for users concerned about heart rhythm. The subscription-free core remains appealing, even if the future is cloudier than the original pitch suggested. Whether Oura responds with firmware updates or a next-generation model remains to be seen, but the competitive pressure is real. For now, though, if you want the most complete smart ring experience, Oura still holds the crown.
Notable Quotes
The to-be-paywalled features were never part of the original pitch, but rather, 'stretch goals' for the device.— Circular's defense regarding future blood pressure and glucose monitoring features
The Hearth Conversation Another angle on the story
Why does the subscription model matter so much here? They're both $349 at the start.
Because $5.99 a month compounds. Over three years, that's over $200 in additional cost. Circular's early backers specifically chose it because they were promised no paywall. That trust matters.
But Circular's adding blood pressure and glucose monitoring behind a paywall later. Isn't that the same thing?
Not quite. Circular's argument is those were bonus goals, not part of the original deal. Oura's subscription was always mandatory from day one. The broken promise is different from a delayed monetization of new features—though I understand why backers feel burned either way.
The Oura wins on fitness tracking by a lot. Does that matter for most people?
It depends on what you do. If you're doing niche activities—badminton, horseback riding, rock climbing—Oura will recognize them and track them properly. Circular will just log generic movement. For someone doing standard cardio and strength work, the difference is smaller.
What about the ECG and AFib detection? That seems like a big deal Oura doesn't have.
It is. That's genuine medical-grade capability. If you have cardiac concerns or a family history, that feature alone might justify choosing Circular despite its other limitations. Oura may add it eventually, but right now it's a real gap.
The battery life difference—seven days versus six—is that meaningful in practice?
Over a week, yes. You get an extra day before charging. And Circular's charging case gets you back to full in thirty minutes, which is genuinely convenient. Oura's charging is slower. For someone who travels or forgets to charge, that matters.
So who should buy which?
Oura if you want the most polished, feature-complete experience and don't mind the subscription. Circular if you prioritize battery life, cardiac monitoring, and want to avoid recurring fees—at least for now.