Full Breakdown
Apple Watch Series 12 and Ultra 4 Expected to Debut New “Readiness” Health App
9/9/2026, 10:10:31 AM
Core Announcement: New Readiness App and Watch Models
Apple is slated to unveil the Apple Watch Series 12 and Apple Watch Ultra 4 at its “Surprise and Shine” event on September 9. Bloomberg reporter Mark Gurman indicated that the same keynote will introduce a new “Readiness” app for the watch, described as a variant of the existing Vitals app. The app is positioned as Apple’s response to recovery-focused platforms from Whoop and Oura.
Background & Context
Apple’s health suite on the watch now includes ECG, blood-oxygen, sleep tracking, and the Vitals app (watchOS 11) which aggregates overnight metrics. Competitors such as Oura and Whoop already provide a daily “Readiness Score.” Gurman’s reporting suggests Apple aims to offer a comparable metric within its ecosystem.
Features Highlighted in Leaked Code
- Separate Readiness app – Code discovered by MacRumors forum member “pdfu” shows an app bundle named “Readiness” (internally “Cobalt”) listed separately from Vitals and placed after the Workout app in the default watchOS 27 Home Screen layout.
- Data inputs – The app is expected to draw on the same health sensors used by Vitals: heart rate, respiratory rate, wrist temperature, blood-oxygen and sleep duration, to generate a recovery-focused assessment.
- New optical sensor – The beta code references a sensor family called Sunstone4p0, described as having lower noise coefficients and adaptive channel selection based on wrist orientation. This aligns with Gurman’s note that Apple is working on “revamped heart-rate sensing.”
- Potential storage increase – A NAND storage profile tied to the T8320 chip points to 128 GB of internal capacity for the Series 12 and Ultra 4, double the 64 GB of current models. The profile appears in watchOS 27 firmware, though earlier watchOS 26 also listed a 128 GB option that never shipped.
Official Statements & Responses
Gurman stated that the Readiness app will be a “variant of the Vitals app” intended to better compete with Whoop and Oura. Apple has not issued a formal comment confirming the app’s name, scoring methodology, or which watch models will support it. The company’s event page confirms the September 9 schedule (10 a.m. Pacific) but provides no details on the software feature.
Conflicting Reports & Gaps
- Storage certainty – While the firmware reference suggests a 128 GB option, Cult of Mac cautions that previous code references did not translate into a shipped specification.
- Continuous heart-rate sensor – Gurman reported that Apple may introduce “always-on” heart-rate tracking, yet the code only shows a new sensor family without explicit confirmation that continuous sampling will be enabled at launch.
- Readiness app availability – The app binary is absent from all public watchOS 27 betas, leaving its interface, scoring algorithm, and launch readiness unknown.
Why It Matters
If released, the Readiness app would give users a single view of recovery status, potentially reducing reliance on third-party devices for similar metrics. Integrating recovery scoring directly into the Apple Watch could strengthen Apple’s health ecosystem and differentiate its wearables from competitors that focus primarily on activity tracking.
What’s Next
The “Surprise and Shine” event on September 9 will be streamed on Apple’s website, YouTube channel, and the Apple TV app. Following the keynote, watchOS 27 is expected to roll out to existing Apple Watch models later in the month, which could bring the newly discovered features to older hardware if they are not limited to the Series 12 and Ultra 4.
