iOS 19 Sideloading: What to Expect

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Looking Ahead to iOS 19 and Sideloading

As iOS 18 continues to mature with its point releases and regulatory-driven updates, the iOS developer community is already looking ahead to iOS 19. Apple typically previews the next major iOS version at its Worldwide Developers Conference (WWDC) in June, with a developer beta following immediately and a public release in September. Based on current regulatory pressure, developer feedback, and Apple’s own trajectory, iOS 19 promises to be a significant release for sideloading — potentially the most consequential since iOS 17.4 introduced EU alternative marketplaces.

This article covers what we expect based on regulatory requirements, developer community intelligence, and Apple’s historical patterns. For context on the current state of sideloading, our guide on how to sideload apps on iOS 18 without jailbreak covers everything available today.

Regulatory Drivers for iOS 19 Changes

Apple does not make sideloading-related changes voluntarily — it makes them under regulatory pressure. Several forces are converging that will likely push Apple to expand sideloading support in iOS 19:

DMA Phase 2 Requirements

The European Commission’s ongoing DMA enforcement may result in binding commitments or fines that require Apple to further open iOS beyond what iOS 17.4 and 18 delivered. If these decisions come in 2025, Apple would have until iOS 19’s development cycle to implement the required changes.

US DOJ Case Potential Outcomes

If the DOJ antitrust case against Apple reaches a consent decree or injunctive relief in 2025-2026, Apple may be required to extend alternative marketplace support to the US market by the iOS 19 timeframe. A US sideloading requirement would affect hundreds of millions of devices immediately.

Japanese and UK Requirements

Japan’s platform legislation and the UK’s Digital Markets Act are both expected to produce binding requirements for iOS openness in 2025-2026. Apple typically implements multi-jurisdiction compliance updates in major iOS releases to avoid maintaining multiple regional code branches.

Expected iOS 19 Sideloading Features

1. Expanded Alternative Marketplace Availability

The most likely change is an expansion of Alternative Marketplace support beyond EU countries. Japan and the UK are the most probable additions, given their advanced regulatory timelines. This would bring the EU-style alternative marketplace experience to a significantly larger user base.

2. Simplified Web Distribution

The current 1 million annual installs threshold for web distribution is seen by many developers as an arbitrary barrier. Regulatory pressure — particularly from the European Commission — may force Apple to lower or eliminate this threshold in iOS 19, making direct web installation accessible to indie developers and smaller apps.

3. Revised Notarization Requirements

Apple’s notarization process for Alternative Marketplace apps has been criticized for being a de facto app review with different branding. iOS 19 may see notarization requirements revised to focus purely on security and malware checks rather than policy and business model compliance, in response to regulatory findings.

4. Enhanced Developer Mode Features

Developer Mode — introduced in iOS 16 — may receive enhancements in iOS 19 that make it more useful for sideloading and testing. Possibilities include persistent Developer Mode that survives device restarts without re-enabling, and broader permissions for Developer Mode apps that reduce the need for workarounds.

5. Improved Alternative Marketplace APIs

For iOS 18’s Alternative Marketplaces to function properly, Apple provides specific APIs for marketplace operators. iOS 19 is expected to expand these APIs with better support for:

  • Background app updates from alternative marketplaces
  • Push notifications managed by alternative marketplace operators
  • App rating and review systems independent of the App Store
  • Better integration with iOS Settings for marketplace-specific preferences

What Probably Will NOT Change in iOS 19

Despite the regulatory pressure, there are aspects of Apple’s control over iOS that are unlikely to change significantly even in iOS 19:

  • Full unrestricted sideloading globally — Apple will continue to require some form of authorization (whether through Alternative Marketplaces or notarization) even in jurisdictions where sideloading is mandated
  • Elimination of the Core Technology Fee — Apple will fight to maintain some revenue mechanism from alternative distribution
  • Removal of notarization — some form of malware scanning will remain regardless of regulatory requirements

What This Means for Scarlet iOS

Whatever Apple does in iOS 19, Scarlet iOS will adapt. The Scarlet team has a track record of staying ahead of iOS security changes and implementing workarounds and new signing methods quickly. More importantly, the core use case for Scarlet iOS — installing any IPA file without Apple gatekeeping — is not something that Apple’s Alternative Marketplace framework addresses, even in its most expanded form.

Alternative Marketplaces will still require notarization. Web distribution will still have some form of qualification requirements. The universe of apps that can be distributed through official channels, even expanded official channels, will always be a subset of all IPA files that exist. Scarlet iOS serves the remainder of that universe, and that remainder is enormous.

For iOS 19 compatibility, Scarlet iOS will likely release an updated version alongside or shortly after iOS 19’s public release. Check our Scarlet iOS download guide for the latest compatible version at any given time.

Developer Perspective: What iOS 19 Should Include

A survey of iOS developer forums and communities reveals consistent requests for iOS 19:

  • Local provisioning that does not require server round-trips for certificate validation
  • Longer certificate lifespans for development-signed apps
  • An increased device registration limit for free Apple IDs
  • Better tools for managing multiple versions of the same app on a device

Some of these requests align with improvements Scarlet iOS is already implementing (as discussed in our Scarlet iOS 2026 roadmap), illustrating how third-party tools often lead Apple in meeting developer and power user needs.

Timeline: When to Expect iOS 19

Based on Apple’s consistent annual release cadence:

  • April-May 2026: First iOS 19 beta leaks and developer previews begin circulating
  • June 2026: Official iOS 19 announcement at WWDC with developer beta
  • July-August 2026: Public beta releases
  • September 2026: Public release alongside new iPhone models

Conclusion

iOS 19 stands to be a pivotal release for iPhone openness. Regulatory forces are aligning in ways that have never converged before, and Apple will be required to implement more substantive sideloading accommodations than in any prior iOS version. While the changes will almost certainly fall short of true unrestricted sideloading, they will represent meaningful progress.

In the meantime, you do not need to wait for iOS 19. Download Scarlet iOS today and enjoy full sideloading capability on iOS 18 right now.

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