AFAIK Modin tries to be the API compatible with Pandas, but then faster/distributed. Vaex tries to be a DataFrame library that is as fast as possible on a singl

AFAIK Modin tries to be the API compatible with Pandas, but then faster/distributed. Vaex tries to be a DataFrame library that is as fast as possible on a single machine to keep things simple and fast (although distributed is on the horizon, we don't need it currently). We're not afraid to break compatibility with pandas, because we care about performance. Both libraries try to hide the laziness from the user.