Do you happen to know how it compares to curio?

Curio is more like an experimental sandbox for its author. Trio was created as a production-oriented application of similar ideas. There are some places where Trio diverges from Curio, and I think Trio's choices are improvements there. For example, the handling of schedule points and cancel points (https://trio.readthedocs.io/en/stable/design.html#cancel-poi...).