Large library with good quality questions that cover a lot of technologies. Also, we can create our own questions. What I liked the most is that we got unlimited assessments in an enterprise plan, which makes the tool useful not only for recruitment but also for continually evaluating our team for upskilling.
Another nice feature is random questions, which will automatically create unique tests per candidate. I like that random questions can be selected based on technology, skill, difficulty, and duration.
The wide variety of programming languages that the platform can evaluate and the comparative score between candidates can give us an idea of their best sides in development (design, problem-solving and so on).