BrowserEngineKit

Framework for building web browsers with alternative (non-WebKit) rendering engines on iOS and iPadOS. Provides process isolation, XPC communication, capability management, and system integration for browser apps that implement their own HTML/CSS/JavaScript engine. Examples target Swift 6.3 and current Apple SDKs.

BrowserEngineKit is a specialized framework. Alternative browser engines are available only through Apple-approved entitlement profiles and supported-region device eligibility. EU support applies to eligible users on iOS 17.4+ and iPadOS 18+; Japan support starts with iOS 26.2 and adds explicit PAC/MIE security requirements for browser apps. Development and testing can occur anywhere. The companion frameworks BrowserEngineCore (low-level primitives) and BrowserKit (eligibility checks, data transfer) support the overall workflow.

Contents

• Overview and Eligibility
• Entitlements
• Architecture
• Process Management
• Extension Types
• Capabilities
• Layer Hosting and View Coordination
• Text Interaction
• Sandbox and Security
• Downloads
• Common Mistakes
• Review Checklist
• References

Overview and Eligibility

Eligibility Checking

Use BEAvailability from the BrowserKit framework to check whether the device is eligible for alternative browser engines. BEAvailability is available on iOS/iPadOS 18.4+:

import BrowserKit

do {
    let eligible = try await BEAvailability.isEligible(for: .webBrowser)
    guard eligible else { return /* fall back or explain */ }
    // Device supports alternative browser engines
} catch {
    // Handle eligibility lookup failure
}