Apple is opening Siri to third-party AI with iOS 27 Extensions. Learn how this AI App Store will transform your iPhone and what it means for developers.
For years, Siri has been the punchline of the AI assistant world. While ChatGPT, Claude, and Gemini have been transforming how people work and create, Siri has struggled to set a timer reliably. But in March 2026, Apple announced something that could change the entire AI landscape: Siri Extensions for iOS 27, a framework that allows third-party AI models to plug directly into Siri. It is, in effect, an AI App Store, and it could be the most significant change to the iPhone since the original App Store launched in 2008.
This article explains what Siri Extensions are, how they work, why Apple is making this move now, and what it means for users, developers, and the broader AI industry.
Siri Extensions is a new framework in iOS 27 that allows third-party AI providers to register their models as "intelligence backends" for Siri. When a user asks Siri a question or gives it a task, iOS can route that request to a third-party AI model instead of (or in addition to) Apple's own on-device models.
Here is how it works in practice:
One of the most talked-about details is Apple's deal with Google to offer Gemini as a built-in Siri Extension option. Reports indicate that Google's Gemini models have been optimised through a distillation process specifically for the Siri Extensions framework, prioritising low latency and tight integration with iOS system features.
This mirrors the long-standing deal where Google pays Apple billions annually to be the default search engine in Safari. The AI equivalent could be even more valuable: being the default intelligence layer on a billion iPhones.
Key Takeaway: Siri Extensions turn the iPhone from a device with one built-in AI assistant into a platform where multiple AI providers compete for your attention. Apple is doing for AI what it did for apps in 2008.
Apple's decision to open Siri to third-party AI is driven by three converging pressures.
The gap between Siri and frontier AI models has become embarrassingly large. While ChatGPT can write essays, analyse code, and reason through complex problems, Siri still struggles with multi-step requests. Rather than trying to close this gap with internal development alone (which would take years), Apple is leveraging its platform position to let the best AI models compete on its hardware.
The EU's Digital Markets Act (DMA) has been pushing Apple to open its platforms to competition. While Siri Extensions go beyond what regulators have explicitly demanded, the move positions Apple favourably with European regulators who have been increasingly scrutinising Apple's ecosystem lock-in.
Apple takes a commission on App Store purchases. Siri Extensions with premium features will be subject to the same commission structure. If millions of users subscribe to AI services through Siri, Apple earns a percentage of every subscription. It is the App Store economic model applied to AI, and the potential revenue is enormous.
Choice: For the first time, iPhone users will be able to choose which AI powers their device. Prefer Claude for writing? ChatGPT for coding help? Gemini for search? You can mix and match.
Quality: Competition among AI providers on the iPhone will drive rapid improvement. When your AI assistant is one tap away from being replaced by a competitor, providers are incentivised to deliver their best.
Integration: Unlike using separate AI apps, Siri Extensions work across the entire operating system. Ask your chosen AI to summarise a webpage in Safari, draft a reply in Mail, or analyse a spreadsheet in Files, all through the unified Siri interface.
Privacy: When Siri routes your request to a third-party AI, your data leaves Apple's ecosystem. Apple has announced strict privacy requirements for Siri Extension providers (on-device processing where possible, no data retention beyond the session, mandatory encryption), but users will need to trust that these rules are enforced.
Cost: Premium AI features through Siri Extensions will likely require subscriptions. The concern is that Siri becomes a two-tier experience: basic functionality for free, and anything genuinely useful behind a paywall.
Fragmentation: If different AI providers handle different types of requests, the user experience could become inconsistent. Apple will need to manage the routing layer carefully to keep interactions feeling seamless.
Key Takeaway: Siri Extensions give users unprecedented choice in their AI assistant, but they also introduce new questions about privacy, cost, and consistency. The success of this platform will depend on how well Apple manages the tension between openness and user experience.
The SiriKit Intelligence API creates a new category of app development. Developers can now build:
Apple's developer documentation (released in beta alongside the iOS 27 developer preview) outlines key requirements:
For AI startups, Siri Extensions represent a distribution channel to over a billion iOS devices. Instead of convincing users to download and open a separate app, your AI can be available everywhere on the device, invoked through voice or text via Siri.
This is comparable to the early App Store days, when being among the first apps in a new category could establish a lasting market position. The developers who build compelling Siri Extensions early will have a significant first-mover advantage.
Google has been more aggressive about integrating AI into Android, with Gemini replacing Google Assistant as the default AI on Pixel and Samsung devices. However, Google's approach is more centralised: Gemini is the AI layer, with limited room for third-party alternatives.
Apple's platform approach is different. By creating a marketplace for AI providers, Apple is betting that competition will produce better outcomes than a single provider. This is a philosophical difference that mirrors the broader debate in AI: should intelligence be provided by one dominant system, or by a competitive ecosystem of specialised providers?
| Aspect | Apple (iOS 27) | Google (Android) | |--------|---------------|-----------------| | Default AI | Apple on-device + user choice | Gemini | | Third-party AI | Yes, via Siri Extensions | Limited | | Revenue model | App Store commission | Ad-supported | | Privacy approach | Strict provider requirements | Google data policies | | Developer access | SiriKit Intelligence API | Gemini API + Android Intents |
Siri Extensions signal that the next great platform war will not be about hardware or operating systems. It will be about AI. The companies that control the AI layer, the intelligence that sits between users and their devices, will capture enormous value.
Apple is positioning itself not as an AI provider but as an AI platform. This is a characteristically Apple move: rather than building the best AI model, build the best platform for AI models to compete on. It is the same strategy that made the App Store, and by extension the iPhone, so dominant.
For anyone learning about artificial intelligence, Siri Extensions are a perfect example of how AI is shifting from a standalone technology to a platform capability embedded in everything we use.
The iOS 27 developer preview with Siri Extensions is expected in June 2026, with a public release in September. Developers who want to be ready should start exploring the SiriKit Intelligence API documentation and thinking about what AI capabilities they can offer through the Siri interface.
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The AI App Store era is beginning. Just like the original App Store created entirely new industries and career paths, Siri Extensions will create opportunities that we cannot yet fully imagine. The question is whether you will be building for this platform or watching from the sidelines.
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