CASTILE

True Castile soap should only contain one oil and that's olive oil. The lather from a Castile soap is one that people either love or hate. Castile soap is very creamy rather than having big bubbles, almost like a serum. 

Castile soap takes at least 6 months to cure and to become a hard enough bar to use.

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BASTILE

Bastile soap came along because some people didn't like the lather of pure Castile soap. So they added a few additional oils to boost the lather while keeping the high olive oil content of the soap. 

A good Bastile soap will contain more than 60% olive oil but the more olive oil used the better. The other added oils must be vegetable based, for example, coconut oil.