iOS 27 Beta Lets You Change How Siri Sounds, and It Is More Useful Than It Sounds

Apple has quietly added something genuinely interesting to the latest iOS 27 beta: the ability to customise how Siri speaks to you. Specifically, you can now adjust Siri's pace, how fast or slow it talks, and its expressivity, meaning how much tonal variation and emotional inflection it uses. It sounds like a small quality-of-life tweak. In practice, it points toward something meaningfully bigger.

The update was spotted in the most recent developer beta and reported by TechCrunch. You access the controls through the Siri settings menu, and the sliders are straightforward: dial up the pace if you want faster responses, dial down the expressivity if you prefer a flatter, more neutral tone. Conversely, if the default Siri voice has always felt a bit robotic for your liking, you can push the expressivity higher for something closer to conversational warmth.

Why Voice Customisation Matters Now

This might seem like a minor accessibility update, and at the base level it is one. Faster speech for power users who already know what Siri is saying. Slower speech for people who prefer to parse responses carefully, or for users with hearing processing differences. More expressive speech for people who find flat AI voices harder to engage with. These are real improvements for real people.

But the timing matters. Apple is in the middle of a multi-year overhaul of Siri's underlying intelligence, having introduced Apple Intelligence features across iOS 26 and now iOS 27. The voice layer is increasingly the primary interface for a significant portion of iPhone interactions, from hands-free navigation to smart home control to on-device AI queries.

When the voice is the interface, how that voice feels is not cosmetic. Research in human-computer interaction has consistently shown that speech rate and prosody, the rhythm and intonation of voice, significantly affect user perception of AI competence, trustworthiness, and likability. A voice that speaks too fast feels dismissive. One that speaks too slowly can feel condescending. The 'right' setting is genuinely personal.

The Competitive Context

Google's Gemini and Amazon's Alexa have both experimented with voice customisation, but Apple's implementation being baked into the OS-level settings rather than hidden in an app makes it significantly more accessible to mainstream users. Most people never dig into third-party app settings. Most people do interact with the system settings menu at least occasionally.

OpenAI's ChatGPT voice mode, which rolled out to wide audiences last year, included several preset voice personalities but no real-time pace or expressivity sliders. Apple's approach is arguably more nuanced, treating the voice as a continuously adjustable parameter rather than a fixed persona.

There is also a business logic here. As AI voice assistants become more capable, the differentiator between them will increasingly be feel rather than raw capability. If two assistants can both answer the same questions accurately, users will stick with the one that feels right to talk to. Siri has historically lost that comparison against competitors in user satisfaction surveys. Giving people control over the voice itself is a smart response.

What Is Still Missing

It is worth noting what iOS 27 is not yet offering. There is no voice cloning or custom voice upload feature, something competitors have begun exploring in limited forms. The adjustments are to the existing Siri voice set rather than an option to choose entirely different voices beyond the existing gender and accent options. And expressivity control does not yet extend to Siri's use within third-party apps via SiriKit, only to native Apple interactions.

The beta timeline suggests iOS 27 will reach general release around September 2026, following Apple's usual pattern. Whether these controls survive from beta to final release unchanged is not guaranteed, though the feature appears polished enough to suggest it is not an experiment.

For anyone who has ever felt slightly irritated by the particular cadence of Siri's default voice, this one is genuinely worth looking forward to.