The only smart ring with Alexa built-in — plus 6-day battery and no subscription
Visit Circular →The Circular Ring 2 is the second-generation smart ring from French wearable company Circular, and it's one of the most feature-packed options in the entire smart ring category. What makes it stand out from the crowd? It's the only smart ring currently available with Amazon Alexa built right in — meaning you can check the weather, set timers, control smart home devices, and ask questions just by tapping your ring and speaking. After a month of daily wear, we came away impressed by how well-rounded this ring is. The titanium build feels premium and substantial without being heavy, the 6-day battery life is right up there with the best in class, and the health tracking suite covers everything you'd expect: sleep stages, heart rate, HRV, skin temperature, SpO2 blood oxygen, and activity tracking. What really sets Circular apart, though, is the pricing — at $299 with zero subscription required, it undercuts Oura significantly on total cost of ownership. The app is clean and well-designed, with daily insights, weekly reports, and a decent selection of third-party integrations including Apple Health, Google Fit, and Strava. It's not perfect — sleep tracking accuracy is good but not quite Oura-level, and Alexa voice control requires your phone to be nearby — but overall, it's one of the strongest all-around smart rings you can buy in 2026.
The only smart ring with Amazon Alexa integrated directly into the hardware. Tap the ring to activate voice control — check weather forecasts, set timers and alarms, control smart home devices, add items to your shopping list, and get answers to questions, all from your finger.
Multi-stage sleep tracking identifies light, deep, and REM sleep, along with sleep duration, efficiency, and interruptions. Combines heart rate variability, skin temperature, and movement data to generate a daily sleep score with actionable improvement tips.
Circular's second-gen hardware delivers up to 6 full days of battery life with all features enabled, including 24/7 heart rate monitoring and sleep tracking. The compact magnetic charger tops it up in about 90 minutes, perfect for charging while you shower.
Packs PPG optical sensors with green and infrared LEDs, skin temperature monitoring, SpO2 blood oxygen tracking, and a high-precision accelerometer. Tracks heart rate, HRV, respiratory rate, menstrual cycles, and activity metrics 24/7.
| Material | Grade 5 titanium |
|---|---|
| Thickness | 2.8mm |
| Weight | 4-6g (size-dependent) |
| Width | 8.2mm |
| Sensors | PPG (green + IR LEDs), skin temperature, SpO2, 6-axis IMU |
| Tracked Metrics | Sleep stages, HR, HRV, SpO2, temperature, activity, steps, calories, menstrual cycle |
| Voice Assistant | Amazon Alexa built-in |
| Battery Life | Up to 6 days |
| Charging | Magnetic USB, ~90 min to full |
| Water Resistance | IP68 (up to 100m) |
| Size Range | US sizes 5-13 |
| Subscription | None required |
| Price | $299 |
| Feature | Circular Ring 2 | Oura Ring Gen 4 | RingConn Gen 2 |
|---|---|---|---|
| Starting Price | $299 | $349 | $299 |
| Subscription | None | $5.99/mo | None |
| 3-Year Total Cost | $299 | $564.64 | $299 |
| Battery Life | 6 days | 7 days | 10 days |
| Material | Titanium | Titanium | Stainless steel |
| Voice Assistant | Alexa built-in | No | No |
| Temperature Tracking | Yes | Yes | Yes |
| Best For | Alexa users & all-round value | Sleep accuracy | Battery life |
Circular Ring 2 has a built-in microphone and uses Bluetooth to connect to the Alexa app on your phone. You tap the ring to wake Alexa, then speak your request naturally. Your phone handles the actual Alexa processing and sends the response back to the ring's built-in speaker. It works well for quick queries and smart home control, but your phone needs to be within Bluetooth range (about 30 feet).
It depends on your priorities. Oura has slightly better sleep tracking accuracy and a more mature app ecosystem with more integrations. Circular Ring 2 costs significantly less over time (no subscription), has Alexa built-in, and offers nearly identical health metrics. If you're an Alexa user or want to save money long-term, Circular is the better choice. If you want the absolute best sleep data, go with Oura.
No, Circular Ring 2 doesn't support phone calls or text messaging through the ring itself. The Alexa feature works for voice commands and queries, but the ring doesn't have cellular connectivity or a speakerphone function. You'll still need your phone for calls and texts.
Circular Ring 2 works with iPhones running iOS 14.0 or later and Android phones running Android 9.0 or later. You'll need Bluetooth 5.0+ for the best connection experience. The Alexa feature requires the Amazon Alexa app to be installed on your phone and signed in with your Amazon account.
The Circular Ring 2 is one of the best all-around smart rings you can buy in 2026, and it's easily the best option for anyone invested in the Amazon Alexa ecosystem. The built-in Alexa voice control is genuinely useful for quick commands, the titanium build feels every bit as premium as Oura, and the 6-day battery life is excellent. When you factor in the $299 price with zero subscription required, it's significantly better value than Oura Ring Gen 4 over a multi-year ownership period. Sleep tracking isn't quite at Oura's gold standard level, but it's close enough for most users. If you want a feature-packed smart ring that doesn't require a recurring payment, Circular Ring 2 should be at the top of your list.
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