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Open source implementation of Apple's Combine
.package(url: "https://github.com/cx-org/CombineX.git", from: "0.4.0")


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Open-source implementation of Apple's Combine for processing values over time.

Though CombineX have implemented all the Combine interface, the project is still in early development.

What is Combine

Customize handling of asynchronous events by combining event-processing operators. -- Apple

Combine is a Functional Reactive Programming (FRP) framework launched by Apple at WWDC 2019. It will definitely be the cornerstone of Swift programming in the foreseeable future.

Get Started

If you develop a library, it's recommended to use CXShim so your library is compatible with SwiftUI.


  • Swift 5.0+ (Xcode 10.2+)


Swift Package Manager (Recommended)

package.dependencies += [
    .package(url: "https://github.com/cx-org/CombineX", from: "0.4.0"),


pod 'CombineX', "~> 0.4.0"

# or, if you want to use `Foundation` extensions: 
pod 'CombineX/CXFoundation', "~> 0.4.0"


github "cx-org/CombineX" ~> 0.4.0

Related Projects

These libraries bring additional functionality to Combine. They are all Combine Compatible Package and you're free to switch underlying Combine implementation between CombineX and Apple's Combine.

  • CXTest: test infrastructure for Combine. It provides useful test utilities like TracingSubscriber and VirtualTimeScheduler.
  • CXExtensions: provides a collection of useful extensions for Combine, such as IgnoreError, DelayedAutoCancellable, etc.
  • CXCocoa: provides Combine extensions to Cocoa, such as KVO+Publisher, Method Interception, UIBinding, Delegate Proxy, etc.


CombineX is released under the MIT license. See LICENSE for details.

The following files are adapted from the Swift open source project:


Stars: 549
Last commit: 3 weeks ago

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iOS Software Engineer @ Perry Street Software
Perry Street Software is Jack’d and SCRUFF. We are two of the world’s largest gay, bi, trans and queer social dating apps on iOS and Android. Our brands reach more than 20 million members worldwide so members can connect, meet and express themselves on a platform that prioritizes privacy and security. We invest heavily into SwiftUI and using Swift Packages to modularize the codebase.

Release Notes

4 weeks ago
  • Move CXShim and CXTest to a separate repo.
  • CombineIdentifier now use lock-free atomics.

Swiftpack is being maintained by Petr Pavlik | @ptrpavlik | @swiftpackco | API