I've heard of Tekla Structures. How is Tekla Structural Designer different from Tekla Structures?

Tekla Structural Designer is a focused analysis and design software package for designing steel and concrete buildings efficiently. Typically used by structural engineers, it enables the user to quickly undertake the modelling, loading, analysis and optimized design of buildings. Benefits of Tekla Structural Designer include productivity, comparison of multiple design options and easy management of project changes. For more information please visit www.tekla.com/products/tekla-structural-designer.

Tekla Structures is a BIM software package for the construction of 3D virtual BIM models which are then used for the production of project documentation (such as construction drawings, material take offs and steel/rebar detailing) plus collaboration with the rest of the project team. Tekla Structures is used by many businesses in the project team, including structural consultants (where it is typically used by technicans), steel fabricators, general contractors, specialist sub-contractors and owners. For more information please visit www.tekla.com/products/tekla-structures.