watchOS 27 code reveals four changes for Apple Watch Ultra 4, more

2026-09-08 | original

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Why This Matters

A last-minute code leak points to watchOS 27 adding a Readiness app and far more detailed strength-training logging, plus hardware hints like a new optical-sensing system and 128GB storage ahead of Apple's Apple Watch Ultra 4 and Series 12 unveiling. If accurate, Apple would be moving directly onto turf held by Oura-style recovery trackers and third-party lifting apps, potentially reducing the need for extra subscriptions and devices.

Key Takeaways

watchOS 27 code references a Readiness app placed right after Workout, suggesting Oura-like recovery scoring built in.
Strength workouts could track individual sets with reps, weight, equipment, body side, and duration.
Code hints at a new optical-sensing system and 128GB storage tied to the new S-class chip in Ultra 4/Series 12.

Worth a Look

Apple Watch Ultra 2 — If the Ultra 4 rumors have you eyeing a rugged Apple Watch, the Ultra 2 is the current flagship with a titanium case, huge always-on display, and deep workout tracking that will get watchOS updates too. It's a great pick for strength training and outdoor sessions the article's leaked features are aimed at.

See Apple Watch Ultra 2 on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.

Apple Watch Ultra 4 and Series 12 will be unveiled tomorrow, and a last-minute leak may reveal new features coming in watchOS 27 for the latest models and more.

New Apple Watch features could include Readiness app, richer strength training options, more

In the last few days, X user pdfu has posted several discoveries from Apple code that hadn’t previously been revealed.

He shared evidence that HomePod will gain surround sound and “party mode” features, and also detailed several pro-focused photography features reportedly coming to iOS 27’s Camera app.

More recently, pdfu has also posted an X article detailing several Apple Watch changes uncovered in watchOS 27 code.

His findings relate to four main features:

New Readiness app

Richer strength workouts

New optical-sensing system for Apple Watch

Hints about 128GB of storage

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