| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| API | — | Yes |
| Self-hosted | Yes | — |
| Plans published | 0 | 1 |
| Spec score · Property-Based Testing Tools | 7.6 (#12) | 7.0 (#23) |
| Generators | Its documented generators cover scalar values, collections, composite values, and domain-based values such as names and dates. | It provides generators and functions for combining them into custom generators. |
| Installation | The README gives Composer as the installation method and shows the command composer require --dev giorgiosironi/eris. | The README instructs users to add the stream_data dependency and run mix deps.get. |
| License | The repository identifies the project as MIT licensed. | The repository README identifies the license as Apache License 2.0. |
| Purpose | Eris brings QuickCheck-style property-based testing to PHP and PHPUnit. | StreamData is an Elixir library for data generation and property-based testing. |
| Reproducibility | When Eris is used outside PHPUnit, the documentation says reproducibility can be obtained by setting the ERIS_SEED environment variable. | The README says failures can be reproduced by reusing the seed that caused them; it does not support storing counter-examples in a file. |