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Following the success of the Circular Ring Pro, Circular has announced the Circular Ring Slim, the world’s thinnest and lightest smart ring, setting new standards for user experience. Notably, it is the very first smart ring to incorporate haptic navigation and alerts, redefining the way we interact with wearable technology. Pairing seamlessly with Kira+, Circular’s formidable AI wellness assistant, the elegantly designed Circular Ring Slim continuously monitors 7 biometrics and 142 derived markers around the clock, aiding individuals in achieving better sleep and overall well-being. It has become a beacon for personalized, preventative health.

Circular is at the forefront of ushering in the next generation of remote monitoring solutions, both for consumers and health professionals. These innovations come in the form of sleek, high-performance smart rings that are effortlessly integrated into daily life. The Circular Ring Slim, marking Circular’s second foray into the world of smart rings, follows in the footsteps of its predecessor, the Circular Ring Pro. Both devices are engineered to be worn continuously, delivering a comprehensive spectrum of health information and living up to the promise of proactive, personalized health management.

Full logo Black

Circular Ring Slim – Petite yet Powerful At an astonishing thickness of just 2.2 mm and a featherweight of 2 grams, the Circular Ring Slim is indisputably the thinnest and lightest wearable globally. Its precision in health tracking is unmatched, thanks to a suite of advanced sensors. Equipped with a three-axis accelerometer for assessing activity and movement, a surface temperature sensor, and advanced PPG sensors that employ green, red, and infrared LED light wavelengths, the Circular Ring Slim captures a diverse range of vital health data, including heart and respiratory rates, blood oxygen levels, and heart rate variability.

With a remarkable 6-day battery life and 20 days of onboard memory, the Circular Ring is designed for continuous wear throughout the day and night. Its ultra-thin, comfortable design ensures a seamless fit, and its matte black titanium shell makes it a stylish accessory suitable for any occasion. Remarkably, it collects health data every 2 minutes, providing 15 times more health data than its competitors. Through uninterrupted monitoring, the Circular Ring Slim constructs a comprehensive health profile and aids in predicting potential health issues.

Circular Slim Red
Circular Slim Red
Circular Slim Green
Circular Slim Green

During the day, the ring captures a multitude of metrics, including activity levels, blood oxygen levels, energy expenditure, heart rate, respiration rate, and chronotype. At night, it passively tracks circadian rhythm, recording sleep quality, heart rate variability, sleep disruptions, REM cycles, and sleep-wake patterns. Its sensors also measure temperature variations during sleep, complementing other biometrics to offer a clearer insight into the immune system and early detection of potential illnesses.

Good Vibrations In addition to its status as the world’s slimmest smart ring, the Circular Ring Slim introduces haptic navigation and feedback. Gone is the traditional Circular Ring Pro button, replaced with a complete haptic navigation interface that allows users to select various functions by tapping inputs anywhere around the ring. Haptic vibrations are leveraged to provide feedback and alerts, driving an array of features. This includes a Smart Alarm Clock that gently awakens users at the optimal point in their sleep cycle, Medication Reminders that ensure timely intake of medication, and Guided Breathing Exercises that provide prompts for calming breathing exercises, ultimately improving sleep hygiene.

Kira+: The AI Assistant for Personalized, Precise, and Predictive Health To extract actionable insights from the wealth of data collected by the Circular Ring Slim, it is seamlessly integrated with Kira+, an AI-powered conversational health and wellness assistant. Kira+, trained with millions of health data points and powered by the latest generative AI language models, offers users a personalized health coach, available 24/7. It delivers health information and recommendations in a reliable and relatable manner.

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Kira+ continually analyzes the ring’s data and gains insight into the user’s habits and preferences over 14 days. With a deep understanding of a user’s parameters, chronotype, digital biomarkers, and health objectives, Kira+ provides tailored health recommendations and analyses free of any monthly subscription fees.

As Kira+ evolves, it leverages the multitude of biomarkers it monitors to predict potential lifestyle or nutritional issues before they arise, acting as an early warning system for medication compliance lapses.

Living within the Circular app, which helps visualize data and trends over time, Kira+ motivates users through gamification strategies, challenges, leaderboards, and even the opportunity to earn Circular Coins through the Circular Coin program. Users can redeem these digital coins for Circular’s products and services, including outer shells, chargers, cables, premium app features, or trusted third-party products and services.

The Circular app seamlessly integrates with a range of other health apps, including Google Fit and Apple HealthKit.

Availability The Circular Ring Slim is available for pre-order starting November 15th, 2023, at a special discounted price of $245 and will commence shipping on December 15th, 2023. Beyond this date, it will be priced at $275. To place an order, visit and embark on your journey to a healthier, more informed future.