You can now customize Siri's pace and expressivity in the latest iOS 27 beta | TechCrunch

Apple Lets Users Fine-Tune Siri's Voice in iOS 27 Beta

Apple has quietly rolled out a new set of controls in the latest iOS 27 beta that let users adjust how Siri speaks — specifically its pace and expressivity. According to TechCrunch, the update gives people the ability to slow down or speed up Siri's speech and dial its vocal expressiveness up or down, offering a more personalized voice assistant experience than what's previously been available.

What's Actually New Here

Voice assistants have historically offered limited customization — maybe a choice of accent or gender, but rarely granular control over delivery style. By exposing pace and expressivity as adjustable parameters, Apple is treating Siri's voice less like a fixed product feature and more like a tunable interface. This suggests Apple's text-to-speech stack has matured enough to support real-time parameter adjustments without requiring wholesale re-recording or re-training of voice models, likely a byproduct of the same generative voice technology improvements powering more natural-sounding AI voices across the industry.

Why This Matters Beyond Siri

On the surface, this looks like a minor accessibility and personalization tweak. But it points to a broader shift relevant to AI coding assistants and developer tools: voice and conversational interfaces are becoming a serious front for how people interact with AI systems, including those used for writing and debugging code. As coding assistants increasingly support voice-driven commands, dictation, and spoken explanations of code, the underlying expectation that users can control tone, speed, and cadence of AI speech will likely extend from consumer assistants like Siri into developer-facing tools.

Expressivity and pace controls also hint at accessibility improvements — slower, more measured speech can help users with cognitive or auditory processing differences, while adjustable expressivity can make interactions feel less robotic or, conversely, less distracting during focused work like coding. For developers who rely on AI pair-programming tools with audio feedback or spoken code review summaries, similar customization could reduce fatigue and improve comprehension during long sessions.

The Competitive Context

Apple has faced sustained criticism over Siri's perceived lag behind rivals like Google Assistant and Amazon Alexa, and especially behind generative AI chat assistants such as ChatGPT and Gemini in terms of conversational fluency. Small but meaningful UX refinements like customizable pace and expressivity signal that Apple is investing in Siri's fundamentals even as it works on deeper generative AI integration reportedly planned for future iOS releases.

What to Watch

As this feature moves through beta testing, it will be worth watching whether Apple extends these voice controls into its developer APIs, potentially giving third-party apps — including AI coding assistants — the ability to tap into more expressive, customizable text-to-speech capabilities natively on iOS and macOS.