Oura Ring 5 debuts as the smallest smart ring in the world, priced at $399.

      TL;DR Oura has introduced the Ring 5, a smart ring that is 40% smaller than its predecessor, measuring 6.09mm wide. This new model includes blood pressure pattern detection and AI-enabled Health Radar monitoring. Priced starting at $399, it will be available for shipping on June 4, as Oura prepares for a US IPO with an $11 billion valuation.

      Oura has unveiled the Ring 5, which is 40% smaller than the previous model, with dimensions of 6.09mm in width and 2.29mm in thickness, making it the smallest smart ring available. Depending on the size, the ring weighs as little as 2 grams, compared to the Ring 4, which measured 7.99mm in width and 2.88mm in thickness. Despite its reduced size, Oura claims the Ring 5 maintains the same sensor accuracy and can last up to nine days on a single charge.

      “We have finally accomplished what I consider a genuine technological milestone,” CEO Tom Hale stated in an interview with CNBC. “This is what our members have been requesting for years.” The Ring 5 can be preordered now, with a price of $399 for black and silver finishes, and $499 for gold, stealth, brushed silver, and deep rose. Shipping is set to begin on June 4. An Oura membership, priced at $5.99 per month or $69.99 annually, is required for use.

      The Ring 5 introduces a new feature called Health Radar, which is an AI-driven monitoring system that continuously observes biometric signals such as body temperature, respiratory rate, and heart rate variability in the background. When Health Radar identifies patterns indicating strain, it alerts the user. Oura has established itself through passive health tracking that operates without screens or notifications, and Health Radar enhances this with predictive features.

      The standout new capability is the Blood Pressure Signals feature, which detects changes and patterns that may reveal cardiovascular strain. However, it's important to note that the ring does not measure blood pressure directly; instead, it monitors biometric trends that relate to increasing blood pressure and warns users if it notices concerning patterns. This feature places Oura in the expanding market for ongoing cardiovascular monitoring, alongside businesses that are working on non-cuff blood pressure assessments for wrist-worn devices.

      Additionally, a Nighttime Breathing feature presents users with a 30-day ongoing perspective of their sleep-related breathing patterns and disturbances, potentially prompting discussions with healthcare providers regarding conditions such as sleep apnea. Oura is also incorporating GLP-1 insights, a tool that tracks weight and bodily changes for users on GLP-1 medications such as Ozempic and Wegovy, offering a long-term view of their treatment journey.

      Oura's launch of the Ring 5 occurs at a crucial time for the company. It has filed confidentially for a US IPO and is valued at around $11 billion following a $900 million Series E funding round led by Fidelity in late 2025. The company has raised about $1.5 billion in total, with additional investments from ICONIQ, Whale Rock, and Atreides, along with a $250 million revolving credit facility facilitated by JPMorgan, Goldman Sachs, Bank of America, Barclays, Citi, and Wells Fargo.

      Oura's financial trajectory is ambitious. The company reported revenues exceeding $500 million in 2024, aiming for roughly $1 billion in 2025, with Hale suggesting the potential to approach $2 billion in sales by 2026. The Ring 5 is tailored to drive that growth by addressing the primary concern of existing users: the ring's thickness.

      The smart ring market has become increasingly competitive. Oura, which pioneered the smart ring category, now faces competition from Samsung, which recently launched the Galaxy Ring at a comparable price of $399, integrated with the Samsung Health ecosystem. The Galaxy Ring weighs as little as 2.3 grams and has gained popularity among users who find smartwatches cumbersome for sleep tracking. While Apple has yet to release a smart ring, reports indicate it is considering this product type, with CCS Insight forecasting an Apple Ring could debut by 2026.

      Wearable fitness trackers have transitioned from simple step counters to advanced health monitoring devices, with the smart ring positioned at the crossroads of convenience and clinical capability. The category attracts users seeking continuous health insights without the necessity of wearing a screen on their wrist, and the Ring 5's smaller size aims to make this exchange even more appealing.

      For Oura, the Ring 5 launch signifies both a new product introduction and a key moment leading up to its IPO. Releasing a smaller and more efficient ring alongside its IPO filing suggests that the company believes it can maintain its growth trajectory as a public entity. The health wearable market is becoming more competitive, but Oura’s strategy relies on the ring’s format together with AI-driven health insights to provide a unique advantage over traditional