An online compiler is required, which can be run without additional downloads and authorization.
It would be great to have more details about the use case.
In this topic, the dominant use case seems to be teaching, and the main obstacle is university bureaucracy. But for individual use (beyond simply trying out the language), I wonder if these services offer a good user experience — a 5–8 year-old laptop or PC may be competitive and offer better responsiveness, IDE choice, and control.