macOS
- macOS Tahoe 26.4 (25E246: What’s new, Developer Release Notes, Security, Enterprise, IPSW, PKG installer
- macOS Sequoia 15.7.5 (24G624): What’s new, Security, PKG installer
- macOS Sonoma 14.8.5 (23J423): What’s new, Security, PKG installer
Also see my post on the changes in macOS 26.4 when changing default apps.
iOS and iPadOS
- iOS 26.4: About, Enterprise
- iPadOS 26.4: About, Enterprise
- iOS and iPadOS 26.4: Developer Release Notes
- Security: 26.4, 18.7.7
Other Platforms
- visionOS 26.4: About, Developer Release Notes, Security, Enterprise
- watchOS 26.4: About, Developer Release Notes, Security , watch OS 5.3.10 and 8.8.2
- tvOS 26.4: About, Developer Release Notes, Security
- HomePod Software 26.4: About
- AirPods: Firmware updates
Applications
- Safari 26.4: WebKit Features, Developer Release Notes, Security
- Xcode 26.4: Mac App Store, Developer Downloads, Developer Release Notes, Security
- Swift 6.3
Guides
- Apple Platform Deployment: Welcome, Revision history