Scheme-it projects can be exported to KiCad-compatible format.
Non-electronics symbols, such as: Diagramming symbols, System Blocks, System Icons,..., will not be exported to KiCad. You will be informed in such case.
(!) KiCad Export is in Beta phase. If you encounter a bug or an unexpected behavior, please let us know by writing to https://forum.digikey.com/c/scheme-it. We appreciate your feedback.