Fplot Corporation, the developer of Harp Password, was founded in 1988. The company specializes in developing user friendly utility software. The first product was the Fplot pen plotter emulator, a product used primarily by architects and engineers.

Fplot developed Harp Password™ as a Windows program in 2010. Fplot released Web app and phone app versions of the software in 2020. The company continues development and support of Harp Password.