
The iPhone Mirroring feature in macOS 15 allows users to display their iPhone's screen on their Mac, enabling them to use apps directly on their phone while manipulating them using the Mac's keyboard and trackpad. The iPhone's audio is also streamed to the Mac. For privacy purposes, the phone's screen remains locked while apps are streaming to the Mac. Additionally, the Mac can receive iPhone notifications alongside Mac notifications. However, there is no information on how the operating systems will handle duplicate notifications from apps like Messages and Calendar that receive the same updates on both platforms.

The new automated window tiling feature in macOS 15 enhances the user experience for those who use both Windows and macOS by providing an easier way to arrange windows on the screen without manually dragging and resizing each one individually or switching into full-screen mode. This feature allows users to automatically organize their windows, making multitasking more efficient and improving the overall workflow for users who split their time between the two operating systems.

macOS 15, codenamed Sequoia, was announced at the Worldwide Developers Conference and comes with several significant changes and features. Some of the main features include:
iPhone Mirroring: This feature allows users to broadcast their iPhone's content onto a Mac without needing the iPhone to be nearby. Users can access their iPhone's notifications and use all of its apps directly from the Mac. The iPhone's audio is also streamed to the Mac, and the iPhone remains secure and locked on the lock screen during this process.
Automated Window Tiling: This feature makes it easier to arrange windows automatically on the screen without manually dragging and resizing each one individually or switching into full-screen mode.
New Passwords App: A new dedicated Passwords app allows users to manage Wi-Fi passwords, app and website passwords, verification codes, and more4. Passwords sync across devices, and macOS uses autofill to populate passwords in the Passwords app4. This app is also available on Windows, thanks to the iCloud for Windows app.
Game Porting Toolkit: The second version of Apple's Game Porting Toolkit simplifies the process of bringing Windows games to macOS and vice versa, making it easier for gamers to access a wider range of games on their preferred platform.
AI-Driven Capabilities: All of Apple's operating systems will benefit from new AI-driven capabilities, including image generation and an updated Siri driven by a large language model (LLM). The "summarize" feature for written text allows users to highlight portions of an email or note, and the operating system generates a summary. Voice Memos and the Phone app also pick up new transcription and summarization capabilities, and an Image Playground app allows users to generate custom images and emoji in Messages, Notes, and other apps.
iOS 18 Features Integration: macOS 15 Sequoia incorporates changes from iOS and iPadOS, such as RCS support and expanded Tapback reactions in Messages, a redesigned Calculator app, and the Math Notes feature for typed equations in Notes.
A developer beta of macOS Sequoia was released on June 10, 2024, with refined public betas planned for July and a full release expected in the fall.