Two Fortran 95 versions of SQPlab are under development.

SQPlight (pronounce S-Q-P-light) is a basic version of SQPlab, essentially suitable for small or medium scale problems, say with a number of variables not exceeding 500. It uses its own quadratic optimization solver, named QPAL, which is based on an augmented Lagrangian approach and solves its linear systems by updated singular Cholesky factorizations.

SQPpro (pronounce S-Q-P-pro) is an improved version of SQPlight, being able to deal with larger problems.