Circular Ring Slim has one genuinely unique feature: a vibration alarm that wakes you by buzzing on your finger. For not disturbing a partner, this is clever. Unfortunately, that's where the good news ends.
The health tracking is severely limited:
- No SpO2 (blood oxygen) monitoring
- No HRV (heart rate variability) tracking
- Basic sleep staging only
- No stress monitoring
- No temperature tracking
- 4-day battery life (shortest in category)
What you get is step counting, basic heart rate monitoring, and sleep duration tracking.
The app is minimal and provides limited insights.
The vibration alarm works—for light sleepers. Deep sleepers report sleeping through it.
At $217-281, it's only $18-82 cheaper than RingConn. For that tiny savings, you give up SpO2, HRV, 6 extra days of battery, and much better sleep tracking.
Skip Circular Ring Slim unless you have a specific, non-negotiable need for the vibration alarm.
