A cutting device includes cutting device includes a housing including an aperture, and a blade cartridge removably coupled to the housing through the aperture. The blade cartridge is configured to hold a plurality of blades. The cutting device further includes a cartridge ejector configured to eject the blade cartridge from the housing.

Safety cutting devices for vehicle seat belts include a housing secured to the tang of a seat belt. The devices include blades within the housing that are selectively movable to cut the seat belt in an emergency situation. The devices are always readily available for use in an emergency situation.