Apple Watch Series 12 and Ultra 4 open for preorder with September 18 launch

CUPERTINO — Apple has officially opened preorders for the Apple Watch Series 12 and the Apple Watch Ultra 4 ahead of their scheduled September 18 retail delivery date, launching the new devices alongside the iPhone 18 Pro and Pro Max following their debut at the company's "Surprise and shine" event.

Despite substantial internal engineering overhauls, Apple has maintained flat starting prices across the entire lineup. The Apple Watch Series 12 starts at $399 for the 42mm size, while the rugged Apple Watch Ultra 4 holds firm at its $799 starting price point. Notably absent from the hardware refresh is any update to the budget-focused Apple Watch SE model, leaving the prior generation in place for entry-level buyers, as reported by The Verge.

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Hardware Overhauls Behind Unchanged Exteriors

The physical designs of both smartwatches remain identical to their predecessors. According to coverage from International Business Times, the Ultra 4 preserves the all-titanium case, 3,000-nit peak brightness display, and 100-meter water resistance of the Ultra 3. Similarly, the Series 12 retains its familiar silhouette while introducing expanded case finishes, including an aluminum lineup in space gray, black, light gold, and dark bronze, alongside titanium variants in radiant gold and natural, and a pearl white or night blue ceramic finish starting at $899, as detailed by Mashable.

Beneath the unchanged exterior lies the S11 chip, Apple's most powerful wearable processor to date. Paired with a redesigned Health Sensing System utilizing larger, more power-efficient green LEDs, the processor enables continuous heart rate measurement every five seconds. Apple states this achieves a 60-fold increase in sampling frequency compared to previous generations, while heart rate variability is now measured every five minutes, representing a 24-fold increase. 9to5mac notes that these metrics position the new sensors among the most accurate heart trackers in any consumer wearable.

Software Features, Readiness Scores, and Audio Intelligence

The massive surge in sensor data directly feeds into new software capabilities, most notably a daily 0-to-10 Readiness score. As reported by Mashable and International Business Times, this metric evaluates recent activity, training load, sleep quality, and vital signs to categorize a user's daily recovery state into prompts such as "Recover," "Pace Yourself," "Ready," or "Go For It." The underlying calculations draw baseline context from the Apple Heart and Movement Study.

Furthermore, the S11 chip powers a suite of Audio Intelligence tools utilizing the watch's built-in microphones and a hardware-isolated Secure Exclave. Arriving later this year, these capabilities include Live Rewind, which generates short text transcripts of the previous 15 seconds of speech via a double press of the Digital Crown, and Siri Recap, which summarizes recent conversations without storing raw audio data.

Upgrading Dilemma and Stakeholder Perspectives

Battery longevity witnesses measurable gains across both form factors. The Series 12 is rated for up to 24 hours of normal usage, while the Ultra 4 extends standard battery life from 42 hours on the prior model to 50 hours, stretching to 84 hours in low power mode. Endurance athletes also gain a Max Extended Workout mode on the Ultra 4, permitting up to 45 hours of continuous GPS tracking every second.

Industry analysts diverge on upgrade recommendations for current device owners. International Business Times highlights that SmartBodyTouch advises users currently running an Ultra 3 to skip this generation due to the lack of exterior modifications, noting that the upgrades are primarily targeted at owners of the original Ultra or Ultra 2 models. early industry reviews point out the absence of anticipated non-invasive blood glucose tracking or cuff-accurate blood pressure monitoring, leaving those speculative features off the spec sheet.

With preorders actively streaming across major online storefronts, retail availability on September 18 will mark the true test for Apple's hardware claims. Independent real-world evaluations from consumers and reviewers will soon verify whether the heightened sensor accuracy, extended battery longevity, and algorithmic Readiness scores perform as advertised outside of controlled corporate testing environments.

Official Perspectives and Regulatory Context on Missing Features

According to International Business Times, Kaiann Drance, Apple's vice president of worldwide Apple Watch product marketing, asserted during the official announcement that the S11 chip and Health Sensing System elevate the Ultra 4 to new levels of capability. Supporting these assertions, Dan Bracaglia, editorial lead at Tom's Guide, confirmed that Apple benchmarked its sensors against competing wearables and traditional chest-mounted heart rate monitors during hands-on testing ahead of release. DigiTimes reported that Apple previously submitted an advanced real-time blood pressure alert feature for review by the U.S. Food and Drug Administration, leaving the arrival of such functionality entirely subject to regulatory decisions rather than current hardware readiness. As consumers weigh these capabilities against the September 18 launch date, the next step will involve independent verification of whether these health systems perform reliably under everyday use.