Pianoteq is a software synthesizer that features real-time MIDI-control of digital physically modeled pianos and related instruments, including electric piano, harp, harpsichord, fortepiano, and various metallophones.

It is usable as a stand-alone program for Microsoft Windows, Mac OS X, iOS, iPadOS and Linux (including ARM architecture) platforms, or as a plug in for VSTi hosts and two VSTi counterpart for use with digital audio workstations.

[2][3] The software's physically modeled synthesis create sound from scratch using several megabytes of mathematical algorithms (Fourier construction) to generate electric piano and acoustic piano sounds that can be manipulated analogously to those produced by their material counterparts.

Several of the historical instruments were created as part of the KIViR (Keyboard Instruments Virtual Restoration) project, which aims to create playable digital models of historical keyboard instruments in museums like the Händel-Haus in Halle.

Other instruments include models for the Hohner Pianet models N and T and Clavinet D6, as well as models for harpsichord, concert harp and Celtic harp, various tine and reed electric pianos, vibraphones, celeste, xylophone and marimba, and various steelpans.