GoKawiil
Tech News
An analysis traces the evolution of memory allocation from stack-based schemes to dynamic linked-list heaps, garbage collection, and jemalloc's 2006 introduction of 'arenas' for NUMA and multi-core memory management. It notes that standard malloc() implementations serialize concurrent allocation requests, causing multithreaded applications to slow down rather than scale as processor counts increase.
A longtime Oura Ring wearer has stopped using smart rings after about a year, citing fit issues caused by weight loss and temperature swings, the need to remove the ring for weightlifting, and damage from frequent hand washing. The user says two devices broke over the period, partly due to inconsistent removal for water exposure and physical activity.
Amazon is selling the Ring Floodlight Cam Wired Pro for $149.99, half its $299.99 list price, matching the lowest price the outdoor security camera has hit. The device includes 3D motion detection, color night vision, and an integrated siren for deterring intruders.
Apple unveiled the Watch Ultra 4, its top-tier smartwatch, featuring an S11 chip, upgraded heart-rate sensors, and battery life reaching 84 hours in low-power mode or 50 hours in normal use. The device introduces a daily readiness score, a VO2 Max test, and an AI-powered insights tab in the redesigned Health app, plus audio intelligence features for environmental sound alerts and conversation tracking.
Circular has released two new smart rings, the Ring 3 Pro and Ring 3 Slim, combining health tracking features with NFC-based contactless payment support and haptic feedback. The move puts Circular ahead of rival Oura in offering payment functionality directly on a smart ring.
A Brazilian ANATEL certification filing lists 10 unannounced Garmin products with nearly identical model numbers, differing mainly by a single letter prefix. This pattern mirrors a similar Indonesian filing last month for a 'CIRQA Smart Ring' that was later removed from public view. The number and structure of variants suggest Garmin is preparing multiple sizes of a wearable device rather than a smartwatch.
Oura has acknowledged in SEC paperwork filed ahead of its IPO that some Ring 4 units suffered battery performance problems, which contributed to an $84.4 million rise in warranty expenses during fiscal 2025. The company replaced affected rings free of charge, sometimes even after the standard one-year warranty had lapsed. Oura has not specified which production batches were affected.
Smart ring maker Oura has filed publicly with the SEC to go public, revealing revenue jumped from $697 million to $1.2 billion in the nine months ending June 30 compared to a year earlier. The company reports selling 3.6 million rings over the past year and now has roughly 5 million paid subscribers, with an 85% annual membership retention rate.
Smart-ring maker Oura revealed financial details as part of its move toward going public, showing it has become profitable. The company reported 74% revenue growth for the nine months ending in June compared with the prior year.
Ultrahuman, a rival to Oura in the smart ring market, secured $70 million from investors including Qualcomm Ventures, Labcorp, Alpha Wave and Blume to fund development of next-generation AI wearables. The company plans to use the funding to advance sensing, materials, electronics and algorithms, and is exploring a future ring that could work with devices like Meta's smart glasses for gesture control, according to chief business officer Bhuvan Srinivasan.
Circular introduced its Ring 3 lineup, split into a feature-rich Pro model and a lighter Slim version, both equipped with NFC chips for contactless payments and vibration-based alerts for alarms and reminders. The Pro adds FDA-cleared ECG for Afib detection, blood pressure trend tracking, glucose tracking and deeper sleep analysis with up to 12 days of battery, while the Slim focuses on core metrics like heart rate, HRV, SpO2 and skin temperature with up to 10 days of battery.
Circular unveiled its Series 3 smart ring at IFA, adding NFC payments compatible with Visa and MasterCard alongside a returning vibration motor for silent alerts. The lineup splits into the fully-featured Ring 3 Pro, with ECG and haptics, and the slimmer, lighter Ring 3 Slim that drops those features. Battery life nearly doubles to 12 days, and both models ship with a 700mAh charging case.