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SwiftCheck

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What SwiftCheck is

SwiftCheck is a free Swift library for property-based testing on iOS and macOS. It automatically generates input data and checks whether properties continue to hold across those inputs. Tests use the `forAll` quantifier and return values conforming to `Testable`; the README shows these properties inside an `XCTestCase` class. SwiftCheck supplies `Arbitrary` implementations for most Swift Standard Library types. Custom types can join by conforming to `Arbitrary` and defining generation and shrinking behavior. If a generated case fails, the library reduces its data toward a minimal counterexample. Generator combinators include `suchThat`, `fromElements`, `choose`, and `frequency`. Properties can be combined with conjunctions and labels, while preconditions can discard inputs that do not apply. Installation options include Swift Package Manager, Carthage, CocoaPods, or adding the Xcode project as a framework dependency. Listed requirements are OS X 10.9+ and iOS 7.0+.

Who it suits

Swift developers who want QuickCheck-style property testing with XCTest on iOS or macOS. It suits projects needing generated inputs and reduced failing examples.

What it does well

  • Automatically generates random test data
  • Shrinks failures toward minimal counterexamples
  • Supports most Swift standard-library types
  • Works with XCTest properties
  • Several installation methods are listed

What to know first

  • No free trial is listed
  • Requires Swift development knowledge
  • Listed systems are OS X 10.9+ and iOS 7.0+

Getting started

  1. Open the SwiftCheck project website
  2. Choose Swift Package Manager, Carthage, or CocoaPods for installation
  3. Add SwiftCheck to the Xcode project as a framework dependency if preferred
  4. Create properties in an XCTestCase test class
  5. Use `forAll` with values conforming to `Testable`

Verdict

SwiftCheck focuses on generated property tests, with shrinking to make failures easier to inspect. Its Swift, XCTest, and multiple installation options fit developers building Apple-platform tests.

Questions

What does SwiftCheck cost?

SwiftCheck is free and includes a free plan.

Is there a free trial?

No free trial is provided; the project is free.

Which platforms does SwiftCheck support?

Its platforms are iOS and macOS, with stated requirements of iOS 7.0+ and OS X 10.9+.

Which languages and test runner does it support?

SwiftCheck supports Swift and demonstrates tests with XCTest.

How can I install SwiftCheck?

Installation routes include Swift Package Manager, Carthage, CocoaPods, or adding the Xcode project as a framework dependency.

What license does SwiftCheck use?

SwiftCheck is released under the MIT license.

Facts from SwiftCheck's own pages

Audience
The project describes itself as QuickCheck for Swift and links a beginner-level tutorial playground for users new to its concepts. · github.com, 9 Oct 2026
Counterexamples
When a generated test case fails, SwiftCheck shrinks the data toward a minimal counterexample. · github.com, 8 Oct 2026
Custom types
Custom types can join generated testing by conforming to the `Arbitrary` protocol and providing generation and shrinking behavior. · github.com, 9 Oct 2026
Generated types
The library implements `Arbitrary` for most Swift Standard Library types. · github.com, 8 Oct 2026
Generators
The library provides generator combinators for choosing values, filtering generated values, and composing generators. · github.com, 9 Oct 2026
Installation
The README describes installation through Swift Package Manager, Carthage, CocoaPods, or by adding the Xcode project as a framework dependency. · github.com, 8 Oct 2026
Integrations
The README documents installation through Swift Package Manager, Carthage, CocoaPods, or by adding the Xcode project as a framework. · github.com, 9 Oct 2026
License
SwiftCheck is released under the MIT license. · github.com, 9 Oct 2026
Platforms
The README states support for OS X 10.9+ and iOS 7.0+. · github.com, 9 Oct 2026
Property composition
Properties can be combined with conjunction and labels, and can include preconditions that discard inputs when they do not hold. · github.com, 9 Oct 2026
Property testing
Its `forAll` quantifier lets tests express properties that should hold across generated inputs. · github.com, 9 Oct 2026
Property tests
Properties use the `forAll` quantifier and return values that conform to `Testable`. · github.com, 8 Oct 2026
Purpose
SwiftCheck is a Swift testing library that automatically generates random data to test program properties. · github.com, 9 Oct 2026
Requirements
The README lists OS X 10.9+ and iOS 7.0+ as supported system requirements. · github.com, 8 Oct 2026
Shrinking
When a generated test case fails, SwiftCheck reduces the data toward a minimal counterexample. · github.com, 9 Oct 2026
Standard library types
SwiftCheck implements `Arbitrary` for most Swift Standard Library types and `Testable` for `Bool` and related types. · github.com, 9 Oct 2026
Support and security
The repository page links issue tracking and contribution guidance; the opened page does not state a support service or security certification. · github.com, 9 Oct 2026
Test framework
The README demonstrates SwiftCheck properties inside an `XCTestCase` test class. · github.com, 8 Oct 2026

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