watchOS 27 Adds Two Apps. One Needs Your iPhone

Your Apple Watch is getting two new apps this year, and whether one of them is any use to you depends entirely on the phone in your pocket. That is the part of the watchOS 27 story that the compatibility lists doing the rounds this week manage to miss completely.

They will tell you whether your watch can install the update. They will not tell you whether the headline feature will actually do anything once it has.

The two new apps arriving in watchOS 27

A dedicated Siri app

Siri is being rebuilt across Apple's platforms this year, and part of that is a standalone Siri app appearing on the Watch alongside the iPhone, iPad, Mac and Vision Pro. You can start a conversation from the app rather than only holding the Digital Crown, which still works exactly as it did.

The more interesting piece is history. The app lets you scroll back through past conversations, and that history syncs across your devices rather than staying on the watch. Ask something on your Mac in the morning and you can pick the thread back up from your wrist later.

Find My, finally as one app

In watchOS 26, finding things on your Apple Watch means three separate apps: Find Devices, Find Items and Find People. watchOS 27 collapses all three into a single Find My app, with a map-first view and a menu in the top-left corner to switch between what you are looking for.

This is the change that will actually improve most people's day, and it is the one nobody is leading with. Three icons down to one on a 40mm screen is worth more than it sounds when you are trying to find your keys in a hurry.

Which Apple Watch models run watchOS 27

The supported list is short. watchOS 27 runs on the Apple Watch Series 9, Series 10, Series 11, Ultra 2, Ultra 3 and SE 3, and nothing else.

That means the Series 8, the first-generation Ultra, the SE 2 and everything older stop here. It is the biggest loss of current-software support in the Apple Watch's history, and it caught a lot of people who bought an Ultra in 2022 expecting a longer run than four years.

One thing to watch for if you are checking older articles: Apple's first published compatibility list wrongly left the Series 9 off, and was corrected afterwards. If you read in June that your Series 9 was being dropped, that was wrong and it is supported.

The catch nobody puts in the watchOS 27 supported devices list

Here is where the standard compatibility list stops being useful. Siri AI on the Apple Watch relies on a nearby Apple Intelligence-compatible iPhone for processing. The watch is the interface, not the brain.

The iPhones that qualify are the iPhone 15 Pro and Pro Max, the iPhone 16, 16 Plus, 16e, 16 Pro and Pro Max, the iPhone 17, 17e, 17 Pro and Pro Max, and the iPhone Air. On the watch side, Siri AI needs a Series 9 or later, an Ultra 2 or later, or an SE 3, which is the same set of watches that can run watchOS 27 at all.

So the watch half of the equation sorts itself out. If your Apple Watch can install watchOS 27, it can run Siri AI. The variable is the phone, and that is the question no supported-devices list is answering.

The practical version: a brand new Series 11 paired with an iPhone 14 will get the Siri app and very little from it. So will your Series 11 on a run when you have deliberately left the phone at home, which is exactly the scenario people buy a cellular watch for.

That second case is the one that bothers me. Cellular on an Apple Watch costs extra every month specifically so the watch can work without the phone nearby, and the marquee software feature of this release quietly does not. Apple has not hidden the requirement, but it has not put it anywhere near the marketing either.

The Find My app has no such condition attached. It works on every watch that can install watchOS 27, with no phone required beyond the one you already pair with, which is a decent illustration of which of these two apps was built for users and which was built for a roadmap.

None of this is surprising if you have followed how slowly this rollout has gone. I wrote about what Siri AI actually does and whether it has shipped after WWDC, and separately about the pieces still missing on this side of the Atlantic. The Watch version inherits every one of those limits.

What this means if you are deciding what to buy

If you are on a Series 8 or a first-generation Ultra, watchOS 27 is your cut-off and the decision has been made for you. The only question is timing, and September is close enough that waiting for the new models makes sense.

If you are already on a Series 9 or later, the upgrade you might need is not the watch. It is the phone, because that is the component gating the feature. Buying a Series 11 to get Siri AI while keeping an iPhone 14 is the wrong end of the problem to spend money on.

And if you are holding out for a redesigned Apple Watch before committing, I would not. The reporting suggests the redesign is not coming with the Ultra 4 or the Series 12, so the shape you can buy now is the shape you will be able to buy in September.

watchOS 27 FAQ

Does watchOS 27 support the Apple Watch Series 8?

No. watchOS 27 runs on the Apple Watch Series 9, Series 10, Series 11, Ultra 2, Ultra 3 and SE 3 only. The Series 8, the first-generation Ultra, the SE 2 and everything older are cut off. It is the largest single drop of Apple Watch models Apple has made. Apple's initial list also wrongly excluded the Series 9, then corrected it, so ignore any compatibility list published before that fix.

Do I need a new iPhone to use Siri on Apple Watch?

You need an Apple Intelligence-compatible one. Siri AI on the Watch relies on a nearby compatible iPhone to do the processing, which means an iPhone 15 Pro or later, an iPhone 16 or 16e, an iPhone 17 or 17e, or an iPhone Air. A Series 11 paired with an iPhone 14 will get the Siri app but not the intelligence behind it.

When does watchOS 27 come out?

Apple has not given a date. watchOS 27 has been in public beta since July and reached developer beta 5 in early August, and Apple has released every recent watchOS version alongside the matching iPhone software in September. That makes a September release the sensible assumption rather than a confirmed one.

My take

The Siri app is the headline and the Find My app is the upgrade. One of them needs a specific phone in your pocket and a rollout that has slipped repeatedly. The other quietly removes two icons from a screen the size of a stamp, and works on every watch that can install the update.

If you want a single sentence to act on: check which iPhone you own before you spend anything on a new Apple Watch, because that is the part deciding what watchOS 27 gives you.

Source: watchOS 27 will add two new apps to your Apple Watch, 9to5Mac