The iOS & iPadOS 26.4 Release Candidate (RC) focuses heavily on developer tools, system stability, and future-facing features, rather than user-facing changes.
🔧 Developer & SDK Updates
- Ships with Xcode 26.4, enabling app development for the latest OS versions
- New APIs and improvements for asset management, StoreKit, and memory protection
- Apps can now opt into enhanced memory integrity enforcement for better security
🚀 New Features (Behind the Scenes)
- Improved Background Assets tools, including offline status checks and local availability controls
- New StoreKit transaction fields for better handling of refunds and revocations
- Early support for RCS end-to-end encryption testing (not yet available to users)
🔒 Security & Performance Enhancements
- Expanded memory safety protections for apps
- Fixes for crashes, networking leaks, and external media mounting issues
- General system stability improvements across frameworks
🧪 Features Still in Testing (Not Yet Public)
- Accessory Notifications framework (EU-only future release)
- AudioAccessoryKit for smarter headphone switching
- RCS encrypted messaging between iPhone and Android
⚠️ Known Issues
- Some developer tools (like Address Sanitizer) may hang on older Xcode versions
- SwiftUI animation conflicts in certain scenarios
- Reality Composer export currently broken
Bottom Line
The iOS 26.4 RC is primarily a polish and infrastructure update, laying the groundwork for future features while improving reliability, security, and developer capabilities. Most changes won’t be immediately visible to users but will enable better app experiences over time.
iOS & iPadOS 26.4 RC Release Notes from Apple
If you like to find our more on iOS 26.4 new features, read this article on iOS 26.4 New Features: 12 New Updates, AI Playlists, CarPlay Chatbots & Emoji You Need to Try
