Circular's upgraded Ring Slim (2024) is the world's thinnest, lightest smart ring with enhanced battery life, build quality, and health tracking features.

Circular's upgraded Ring Slim (2024) is the world's thinnest, lightest smart ring, offering enhanced battery life, build quality, and health tracking features. The new sleep algorithm and accurate heart rate monitoring during sports activities are included, along with the Kira+ app, which tracks and analyzes health data without subscription fees. The smart ring market is growing, with Circular competing against Oura, Ultrahuman, and others.