I love open source and open systems in general. Popular competitive programming platforms aren't like that: not only is their source code closed, but they also don't publish the test cases used to evaluate submissions.

There are already projects that can submit your solutions through the LeetCode API and return the results. But I don't really like that approach, so I decided to build an open set of tests that aims to match the quality of LeetCode's tests as closely as possible. This way, you can run everything locally, without needing for example, an internet connection.

I see the project being useful for its most straightforward purpose: testing your solutions locally on your own hardware, without any submission delays and even completely offline. Since the tests are open, people can also build different tools around them. For example vim extensions and other integrations. Ofc it's not that simple, we currently support about 1400 problems (out of 4000~, including premium), and not all topics are covered.