QuickTheories vs SwiftCheck
QuickTheories
github.comSwiftCheck
github.comSide by side
| Figure | QuickTheories | SwiftCheck |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| macOS | — | Yes |
| iOS | — | Yes |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 1 | 0 |
| Spec score · Property-Based Testing Tools | 7.7 (#10) | 6.5 (#27) |
| Audience | The README describes the library for Java developers who want to test general properties and invariants of their code. | The project describes itself as QuickCheck for Swift and links a beginner-level tutorial playground for users new to its concepts. |
| Generators | Its generator DSL can create common Java types, constrain generated values, and combine or convert generators for custom types. | The library provides generator combinators for choosing values, filtering generated values, and composing generators. |
| License | The repository identifies its license as Apache-2.0. | SwiftCheck is released under the MIT license. |
| Purpose | QuickTheories is a property based testing library for Java 8, described as a Java version of QuickCheck. | SwiftCheck is a Swift testing library that automatically generates random data to test program properties. |
| Shrinking | It automatically tries to find smaller or simpler values that still falsify a property, without requiring custom shrinking code for each type. | When a generated test case fails, SwiftCheck reduces the data toward a minimal counterexample. |
Plans
In their own words
QuickTheories
QuickTheories is a free, open-source property-based testing library for Java 8. It checks general properties and invariants by generating random valid inputs, then automatically searches for smaller or simpler values that still fail a property. The library reports the seed for a falsified property, and tests can use fixed seeds for deterministic runs. Its generator DSL creates common Java types, constrains values, and combines or converts generators for custom types. QuickTheories works with JUnit, TestNG, and other test frameworks; `checkAssert` supports assertion libraries such as AssertJ and Hamcrest. The `forAll` API handles theories over one to four generated values. System properties configure seeds, example counts, and shrink attempts, while named profiles can reuse settings. An experimental coverage feature targets new code paths, but may reduce performance by about 10% and interfere with JaCoCo or other coverage systems. The project uses the Apache-2.0 license.