Name: Apple Watch Ultra 4
Brand: Apple

The pitch almost writes itself. A new Apple Watch is up for preorder, and the marketing leans on everything you can see — fresh colours, a returning ceramic case, a screen that pushes brighter in daylight. Look past the finish, though, and the part of this year’s watches worth paying for is the part you cannot see at all.

For the first time in a while, the chip doing the work is genuinely new, and the sensor stack that reads your body has been rebuilt rather than retuned. That is the real change. Everything on the outside is the sort of thing you notice for a week and then forget; what sits under the glass is what you actually live with.

Start with the money, because that is the thing that changes for a buyer. The Series 12 opens at $399 for the smaller aluminium model and $449 for the larger one; adding cellular takes them to $490 and $549. Titanium runs $699 and $749, and the returning ceramic case tops the line at $949. In the UK the Series 12 starts at £369. The Ultra 4 holds its line at $799, or £749.

What that money buys, mechanically, is an S11 chip — the first meaningful silicon jump in three years. The previous watch reused the S10, which was itself the 2023 S9 under another name, so a genuinely faster processor is not a small thing. It is what powers the new health sensing and the Audio Intelligence layer that transcribes conversations and recognises sounds, alongside a more capable Siri.

The health system is where Apple did the real engineering. Background heart-rate readings now come every five seconds, heart-rate variability is sampled every few minutes, and a Readiness score folds sleep, training load and vitals into a single number. What is still missing tells its own story: there is no blood-glucose sensor and no blood-pressure feature, the two additions people keep waiting for.

On the Series 12 the aluminium models gain Ceramic Shield 2, rated about 60 percent tougher than the Ion-X glass it replaces, and a display that reaches 2,000 nits. Everyday battery life stays around a day, with roughly twelve hours back from a fifteen-minute charge — enough to top up before a night of sleep tracking.

The Ultra 4 is the harder sell. Its battery climbs to a genuinely useful 50 hours of normal use, up from 42, and 84 in low power. But its headline safety feature — emergency SOS via satellite — gained nothing new this year, and from across a room you could not tell it from last year’s model. For someone who already owns an Ultra 3, the case to spend $799 again is thin. The generational jump this year lives in the cheaper watch, not the expensive one.

Preorders are open now; the watches ship and reach stores on September 18, with watchOS 27 arriving a few days ahead of them. The Series 12 has no satellite connectivity — that stays an Ultra feature — and both models run on 5G RedCap and LTE. Every configuration is available directly from Apple and through the usual carriers and retailers.

The honest read is an unusual one for a launch day: the $399 watch is the one that actually changed this year, and the $799 one is mostly asking you to trust that it already had.

Tags: Apple, Apple Watch Series 12, Apple Watch Ultra 4, S11 chip, smartwatches